2021/09/27 更新

写真a

クリハラ トシユキ
栗原 敏之
KURIHARA Toshiyuki
所属
教育研究院 自然科学系 地球・生物科学系列 准教授
理学部 准教授
自然科学研究科 環境科学専攻 准教授
職名
准教授
外部リンク

学位

  • 理学 ( 2002年3月   筑波大学 )

  • 理学 ( 1999年3月   筑波大学 )

  • 理学 ( 1997年3月   筑波大学 )

研究分野

  • 自然科学一般 / 地球生命科学

経歴(researchmap)

  • 新潟大学   自然科学研究科 環境科学専攻   准教授

    2010年12月 - 現在

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  • 新潟大学   理学部 地質科学科   准教授

    2010年12月 - 現在

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  • 新潟大学   自然科学研究科 環境科学専攻   助教

    2010年4月 - 2010年11月

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  • 新潟大学   自然科学研究科 自然構造科学専攻   助教

    2009年2月 - 2010年3月

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経歴

  • 新潟大学   自然科学研究科 環境科学専攻   准教授

    2010年12月 - 現在

  • 新潟大学   地質科学科   准教授

    2010年12月 - 2017年3月

  • 新潟大学   自然科学研究科 環境科学専攻   助教

    2010年4月 - 2010年11月

  • 新潟大学   自然科学研究科 自然構造科学専攻   助教

    2009年2月 - 2010年3月

 

論文

  • Geochemistry and Sr-Nd isotopic composition of meta-gabbros from the Omi serpentinite melange, Niigata, SW Japan: Evidence for subduction erosion in an immature early Paleozoic arc-trench system in proto-Japan

    M. Satish-Kumar, T. Kurihara, R. Shishido, T. Yoshida, T. Takahashi, R. Nohara-Imanaka

    LITHOS   398   2021年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER  

    The Renge Belt is a rare subduction-related metamorphic belt that contains blocks of eclogites, meta-gabbros, schists and other rocks in a serpentinite me acute accent lange that formed in the early-to-middle Paleozoic of proto-Japan. We report here a detailed geochemical and Sr--Nd isotope study of two major groups of rocks within the Omi serpentine me acute accent lange: 1. medium-grade metamorphosed blocks of meta-gabbros, and 2. high-pressure low-temperature eclogites and mafic schists. Bulk rock geochemistry of the meta-gabbros reveals that they have prominent Nb, Ta and Ti negative anomalies, suggesting an arc origin. In contrast, the eclogites, and mafic schists have trace element spider diagrams and REE patterns that resemble modern oceanic crust. The Sr--Nd isotopic compositions also show concomitant variations with a highly depleted source for the meta-gabbros (epsilon Nd values of +1.3 - +9.6 and Sriratios of 0.70301-0.70460) compared with a MORB/OIB-like source of the eclogites and mafic schists (epsilon Nd values of -1.94 - +4.83), although the latter have Sr isotopes variably affected by seawater interaction (Sr(i)ratios of 0.70518-0.71050). Altogether, the geochemical features suggest that the meta-gabbros were part of a magmatic arc, which developed in the Cambrian and was tectonically eroded and subducted together with oceanic crust and sediments in the Devonian-Carboniferous. The ages of detrital zircons in the pelitic schist (3200-600 Ma) suggests that the South China Craton and northeastern fringes of Gondwana were potential source regions and that the sedimentation occurred most likely in a trench. The abundant Early Paleozoic (peak around ca. 470 Ma) detrital zircons were derived from an active subduction-related arc. The protoliths of metagabbros are lower crustal equivalents of an infant arc, which was subducted via subduction erosion in the Devonian-Carboniferous and reached a HP metamorphic depth in the Tournasian. Our results suggest that the formation of proto-Japan was related to the initiation of intra-oceanic arc as early as Cambrian. Following tectonic erosion, the remnant mafic rocks were amalgamated with trench-fill sediments during incorporation in an accretionary complex. Subduction erosion was active where sediment supply was low and where the arc was immature. Subduction of oceanic crust was continuing to at least the middle Carboniferous, when the eclogites and blueschists were formed and later exhumed along with the meta-gabbros in serpentinite diapirs in the mid-late Paleozoic.

    DOI: 10.1016/j.lithos.2021.106260

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  • U-Pb ages and sandstone provenance of the Permian volcano-sedimentary sequence of the Hida Gaien belt, Southwest Japan: Implications for Permian sedimentation and tectonics in Northeast Asia

    Keisuke Suzuki, Toshiyuki Kurihara

    JOURNAL OF ASIAN EARTH SCIENCES   219   2021年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:PERGAMON-ELSEVIER SCIENCE LTD  

    The Permian volcano-sedimentary strata of the Hida Gaien belt of SW Japan are characterized by Lower Permian felsic tuffs and tuffaceous clastic rocks, Middle Permian andesites and sandstones rich in volcanic detritus, and upper Middle to Upper Permian feldspathic sandstones and mudstones. A combination of petrographic and geochemical analyses together with zircon U-Pb dating for the sandstones reveals a provenance change from an immature undissected arc with active felsic and intermediate volcanism during the Early-Middle Permian to a mature arc with basement uplift during the Late Permian. The Upper Permian sandstone yields syn-depositional zircons with 500-400 Ma zircons. This age distribution suggests that sediment was derived from the Permian arc and early Paleozoic basement. Similar characteristics to Permian strata in the Hida Gaien belt are recognized in the eastern Central Asian Orogenic Belt in terms of detrital zircon ages and the change in dominant lithology from volcanic to clastic rocks. In particular, Permian strata of the Jilin area (NE China) are lithostratigraphically similar to those of the Hida Gaien belt and have similar detrital zircon U-Pb ages. As such, Permian strata in both areas would have been deposited proximal to each other in the same tectonic setting along a single subduction zone in the western Paleo-Pacific Ocean.

    DOI: 10.1016/j.jseaes.2021.104888

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  • Revisiting the tectonic evolution of the Triassic Palaeo-Tethys convergence zone in northern Thailand inferred from detrital zircon U–Pb ages 査読

    Hidetoshi Hara, Tetsuya Tokiwa, Toshiyuki Kurihara, Thasinee Charoentitirat, Apsorn Sardsud

    Geological Magazine   158 ( 5 )   1 - 25   2020年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Cambridge University Press (CUP)  

    <title>Abstract</title>
    Detrital zircon U–Pb ages for sediments in and around the Palaeo-Tethyan convergence zone in northern Thailand provide constraints for tectonic interpretations of the Indochina Block, the Sibumasu Block, the Inthanon Zone accretionary complex and the Nan Back-arc Basin during the Triassic. In sedimentary rocks of the Indochina Block, almost all of the Palaeozoic and Triassic zircons were sourced from the collision zone between the Indochina and South China blocks, and an active continental margin in the western Indochina Block. Sediments of the Sibumasu Block were supplied by erosion of Archaean basement and from the Grenville and the Pan African orogenies, but show no record of Permian to Triassic igneous activity. Accretionary complex sediments have provenances of both the Sukhothai Arc and the Indochina and South China blocks, with detrital zircons of various ages being supplied from crustal uplift and erosion related to the Indosinian I orogeny. Sedimentary rocks of the Nan Back-arc Basin are widely distributed not only in the Nan–Uttaradit but also in northern Sukhothai areas. The origin of the Pha Som Metamorphic Complex and associated formations can be traced to basin-filling sediments in the Nan Back-arc Basin. These detrital zircon U–Pb ages have also allowed identification of the changing tectonic setting in the Palaeo-Tethys convergence zone from the ‘erosion of Proterozoic continental basement’ to ‘Palaeozoic active continental margin in the western Indochina Block’ and ‘Palaeozoic, Permian to Triassic collision zone between the South China and Indochina blocks’ through to ‘Triassic active Sukhothai Arc’.

    DOI: 10.1017/s0016756820001028

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  • Preface: The 15th Meeting of the International Association of Radiolarists (InterRad XV), 20 October-1 November, 2017, Niigata, Japan (Part 2) 査読

    Atsushi Matsuoka, Toshiyuki Kurihara, Yoshihito Kamata, Atsushi Takemura

    PALEONTOLOGICAL RESEARCH   24 ( 2 )   87 - 88   2020年4月

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    記述言語:英語   出版者・発行元:PALAEONTOLOGICAL SOC JAPAN  

    DOI: 10.2517/2020PR002

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  • A morphological analysis of the flat-shaped spumellarian radiolarian Dictyocoryne: morpho-functional insights into planktonic mode of life 査読

    Yuta Shiino, Toshiyuki Kurihara, Ryo Ichinohe, Naoko Kishimoto, Takashi Yoshino, Atsushi Matsuoka

    PALEONTOLOGICAL RESEARCH   24 ( 2 )   134 - 146   2020年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:PALAEONTOLOGICAL SOC JAPAN  

    The three-dimensional morphology of the flat-shaped spumellarian radiolarian Dictyocoryne was analysed using a microfocus X-ray CT with a special focus on whether it was capable of a planktonic lifestyle. Two types of 3D models, the shell model, which represents a realistic 3D shell, and the wrapped model, which mimics the whole body outline without pseudopodia, were reconstructed in order to estimate volume, surface area, and centres of gravity for the shell model and buoyancy for the wrapped model. The calculated values showed that the volume of shell with respect to the total volume was negatively allometric, regardless of the differences between threshold settings. Stepwise secretions of the patagium layer may result in a comparatively lightweight shell, thereby decreasing the total density during growth but not below the density of seawater. Estimated positions for the centres of gravity and buoyancy were too close to maintain an autonomous posture while floating. Instead, the ratio between surface area and volume was greater than that in an ideal sphere. Such a broad surface area could obtain the viscous resistance necessary for sinking retardation. Spumellarian radiolarians, including Dictyocoryne, have photosynthetic symbionts located primarily in the ectoplasmic layer, which is a habitable space that can be maximised within the larger surface area. Given that radiolarians float when extending their pseudopodia, it can be hypothesised that pseudopodia may play a role in the adjustment of life posture in a hydraulically unstable shell, which can be integrated into sinking retardation, enhancement of photosynthetic activity and manoeuvrability of life posture within a unique flat-shaped morphogenesis.

    DOI: 10.2517/2019PR020

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  • Active floating with buoyancy of pseudopodia versus passive floating by hydrodynamic drag force: A case study of the flat-shaped spumellarian radiolarian Dictyocoryne 査読

    Ryo Ichinohe, Yuta Shiino, Toshiyuki Kurihara, Naoko Kishimoto

    PALEONTOLOGICAL RESEARCH   23 ( 4 )   236 - 244   2019年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:PALAEONTOLOGICAL SOC JAPAN  

    It has been suggested that the pseudopodia of radiolarians play a role in controlling buoyancy for floating behaviour. To understand the function of pseudopodia in terms of planktonic capability, we performed culture experiments on the flat-shaped radiolarian Dictyocoryne. A glass cell, a stereomicroscope and an X-Y-Z stage were used to observe the behaviour of Dictyocoryne from a lateral view. Under static conditions, Dictyocoryne grounded on the bottom of the glass cell extended pseudopodia from both sides of the flat disc surface. Subsequently, these individuals rose slightly by a length equal to that of the extended pseudopodia but remained attached to the bottom. These results suggest that Dictyocoryne lacks the ability to surface by obtaining buoyancy through the emergence of pseudopodia. Under conditions of convection flow, Dictyocoryne moved in the downstream direction only when pseudopodia were completely extended. When the convection flow moved upward, the individuals moved with the flow to just under the surface. In addition, convection flow changed the direction of a long, thick pseudopodium, called the axoflagellum, to be parallel with the flow. Consequently, the axoflagellum was always oriented towards the downstream side, being the disc face in the axollagellum side on the upturn. Given that the flat-shaped spumellarians has c symbiotic algae inside their cells, their unique planktonic capability leads to the stable efficiency of the algal photosynthesis.

    DOI: 10.2517/2018PR023

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  • Preface: The 15th Meeting of the International Association of Radiolarists (InterRad XV), 20 October-1 November, 2017, Niigata, Japan 査読

    Atsushi Matsuoka, Toshiyuki Kurihara, Yoshihito Kamata, Atsushi Takemura

    PALEONTOLOGICAL RESEARCH   23 ( 4 )   235 - 235   2019年10月

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    記述言語:英語   出版者・発行元:PALAEONTOLOGICAL SOC JAPAN  

    DOI: 10.2517/2019PR014

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  • Chitinozoans and scolecodonts from the Silurian and Devonian of Japan 査読

    Thijs R. A. Vandenbroucke, Olle Hints, Mark Williams, Simon Wallis, Jules Velleman, Toshiyuki Kurihara, Gengo Tanaka, Toshifumi Komatsu, Peep Mannik, David J. Siveter, Tim de Backer

    ISLAND ARC   28 ( 3 )   2019年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:WILEY  

    Silurian and Devonian chitinozoans and scolecodonts are recorded from strata of the Hida-Gaien Terrane, central Honshu. Silurian chitinozoans include Eisenackitina, Bursachitina, and the species Angochitina elongata. The latter provides a precise biostratigraphical tie between the Japanese succession and the Type Ludlow Series of the Welsh Borderland, UK, and indicates a Ludlow age (Gorstian or early Ludfordian) for the upper member of the Yoshiki Formation in the Ichinotani Valley. Chitinozoans from other Yoshiki Formation localities contain other specimens of Lagenochitinidae. Scolecodonts are more common than chitinozoans in the palynological residues, but are mostly represented by fragments or minor apparatus elements with a low biostratigraphical value. However, material from the Yoshiki and Fukuji Formations includes several species of Mochtyella as well as representatives of Oenonites, Kettnerites, Lunoprionella, Vistulella? and possibly other placognath taxa. Scolecodonts are also present in the Silurian Middle Member of the Gionyama Formation, Kyushu, including a well-preserved jaw of Pistoprion, and fragments of putative Kettnerites and Oenonites. These finds of scolecodonts suggest close similarity in assemblages between Paleozoic polychaete faunas of Japanese terranes and those of Baltica-Laurentia.

    DOI: 10.1111/iar.12294

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  • Permian-Triassic back-arc basin development in response to Paleo-Tethys subduction, Sa Kaeo-Chanthaburi area in Southeastern Thailand 査読

    Hidetoshi Hara, Tetsuya Tokiwa, Toshiyuki Kurihara, Thasinee Charoentitirat, Auranan Ngamnithiporn, Krai Visetnat, Kohei Tominaga, Yoshihito Kamata, Katsumi Ueno

    GONDWANA RESEARCH   64   50 - 66   2018年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

    The Sa Kaeo Back-arc Basin in Southeastern Thailand developed behind the Sukhothai Arc along the western margin of the Indochina Block during the Permian to Triassic in response to the subduction of the Paleo-Tethys oceanic plate. To clarify its tectonic evolution of spreading, basin-infilling, and closure, we have investigated the provenance of its clastic sediments, the U-Pb ages of detrital zircons, the geochemistry of its basaltic rocks, and the structures in melange. The rocks in the Sa Kaeo Back-arc Basin include two contrasting lithological units: the Thung Kabin Melange, composed mainly of basaltic rocks, chert, limestone, and sandstone, along with melange; and the Pong Nam Ron Formation, a thick succession of elastic sediments. Our observations suggest that the clastic sediments of the Pong Nam Ron Formation were deposited widely over the oceanic rocks (basaltic rocks, chert, and limestone) of the Thung Kabin Melange. Geochemical analyses indicate that sandstones in both units (the Thung Kabin Melange and the Pong Nam Ron Formation) are characterized by a provenance of mostly basaltic rocks. The U-Pb ages of detrital zircons from both units present similar age distributions: the youngest single-grain zircon (YSG) is early Late Triassic in age, the youngest cluster of zircons (YC1 sigma) is latest Permian to earliest Triassic in age, and there is a range of other Paleozoic and Proterozoic zircons. Based on these geochemical analyses and the U-Pb dating, the sandstones of both units had the same provenance. In addition, the basaltic rocks of the Thung Kabin Melange are originated from back-arc basin basalts. These new observations have allowed us to reconstruct the tectonic evolution of the basin. In the Early Permian, spreading took place in the basin accompanied by basaltic magmatism. Subsequently, corresponding to an inactive period of the Sukhothai Arc into the Middle Triassic, the Sa Kaeo Back-arc Basin subsided, and a deep-sea environment prevailed with the formation of Permian cherts, Permian limestones, and Middle Triassic cherts. During the Triassic, the basin was filled by elastic sediments and eventually closed. The elastic sediments were sourced directly from the back-arc basin basalts, as well as from the felsic volcanic rocks of the active Sukhothai Arc (which yield Permian to Triassic zircons), and from the continental materials of the Indochina Block (Paleozoic and Proterozoic zircons). After the closure of the Sa Kaeo Back-arc Basin, the discussed area was affected by the termination fault fan related to the Mae Ping Fault Zone. (C) 2018 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.gr.2018.06.007

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  • The passive spatial behaviour and feeding model of living nassellarian radiolarians: Morpho-functional insights into radiolarian adaptation 査読

    Ryo Ichinohe, Yuta Shiino, Toshiyuki Kurihara

    MARINE MICROPALEONTOLOGY   140   95 - 103   2018年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

    Sinking experiments using living nassellarian radiolarians with a conical shell form were performed to examine the spatial behaviour of nassellarians and a related feeding model. A small water tank and surface-reflecting mirror were used to observe the vertical movement of each specimen, and the sinking posture and speed were analysed. The experimental results showed that the sinking posture of nassellarians was stable with a cephalis-down orientation, and the sinking speed was considerably slower than that of Dictyocoryne spp. as a control experiment. The stable posture was maintained by a streamlining shell form and the relationship between the centres of gravity and buoyancy. Moreover, a lift force in moving fluids would likely change the posture of the organism to the cephalis facing upstream, as in a weathercock effect. As a result, nassellarians were able to capture organic matter around the rear side of the aperture where prey-capturing pseudopodia are extended. Because the pseudopodia may be attributed to the lifelong performance of the surface of cell membranes, the drastic change in flow intensity around the pseudopodia leads to an easier collapse of the prey-capturing apparatus. A slower sinking speed as the size increases is a beneficial feature for avoiding the feeding risk, resulting in effective predation as a form of homeostatic spatial behaviour.

    DOI: 10.1016/j.marmicro.2018.02.002

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  • Permian arc evolution associated with Panthalassa subduction along the eastern margin of the South China block, based on sandstone provenance and U-Pb detrital zircon ages of the Kurosegawa belt, Southwest Japan 査読

    Hidetoshi Hara, Miho Hirano, Toshiyuki Kurihara, Toshiro Takahashi, Hayato Ueda

    JOURNAL OF ASIAN EARTH SCIENCES   151   112 - 130   2018年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:PERGAMON-ELSEVIER SCIENCE LTD  

    We have studied the petrography, geochemistry, and detrital zircon U-Pb ages of sandstones from shallow marine forearc sediments, accretionary complexes (ACs), and metamorphosed accretionary complexes (Meta-ACs) within the Kurosegawa belt of Southwest Japan. Those rocks formed in a forearc region of a Permian island arc associated with subduction of the Panthalassa oceanic crust along the eastern margin of the South China block (Yangtze block). The provenance of the shallow-marine sediments was dominated by basaltic to andesitic volcanic rocks and minor granitic rocks during the late Middle to Late Permian. The ACs were derived from felsic to andesitic volcanic rocks during the Late Permian. The provenance of Meta-ACs was dominated by andesitic volcanic rocks in the Middle Permian. The provenance, source rock compositions, and zircon age distribution for the forearc sediments, ACs and Meta-ACs have allowed us to reconstruct the geological history of the Permian arc system of the Kurosegawa belt. During the Middle Permian, the ACs were accreted along the eastern margin of the South China block. The Middle Permian arc was an immature oceanic island arc consisting of andesitic volcanic rocks. During the Late Permian, the ACs formed in a mature arc, producing voluminous felsic to andesitic volcanic rocks. A forearc basin developed during the late Middle to Late Permian. Subsequently, the Middle Permian ACs and part of the Late Permian AC underwent low-grade metamorphism in the Late to Early Jurassic, presenting the Meta-ACs.

    DOI: 10.1016/j.jseaes.2017.10.025

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  • Detrital zircon multi-chronology, provenance, and low-grade metamorphism of the Cretaceous Shimanto accretionary complex, eastern Shikoku, Southwest Japan: Tectonic evolution in response to igneous activity within a subduction zone 査読

    Hidetoshi Hara, Yoshihiro Nakamura, Kousuke Hara, Toshiyuki Kurihara, Hiroshi Mori, Hideki Iwano, Tohru Danhara, Shuhei Sakata, Takafumi Hirata

    ISLAND ARC   26 ( 6 )   2017年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:WILEY  

    Detrital zircon multi-chronology combined with provenance and low-grade metamorphism analyses enables the reinterpretation of the tectonic evolution of the Cretaceous Shimanto accretionary complex in Southwest Japan. Detrital zircon U-Pb ages and provenance analysis defines the depositional age of trench-fill turbidites associated with igneous activity in provenance. Periods of low igneous activity are recorded by youngest single grain zircon U-Pb ages (YSG) that approximate or are older than the depositional ages obtained from radiolarian fossil-bearing mudstone. Periods of intensive igneous activity recorded by youngest cluster U-Pb ages (YC1 sigma) that correspond to the younger limits of radiolarian ages. The YC1 sigma U-Pb ages obtained from sandstones within melange units provide more accurate younger depositional ages than radiolarian ages derived from mudstone. Determining true depositional ages requires a combination of fossil data, detrital zircon ages, and provenance information. Fission-track ages using zircons estimated YC1 sigma U-Pb ages are useful for assessing depositional and annealing ages for the low-grade metamorphosed accretionary complex. These new dating presented here indicates the following tectonic history of the accretionary wedge. Evolution of the Shimanto accretionary complex from the Albian to the Turonian was caused by the subduction of the Izanagi plate, a process that supplied sediments via the erosion of Permian and Triassic to Early Jurassic granitic rocks and the eruption of minor amounts of Early Cretaceous intermediate volcanic rocks. The complex subsequently underwent intensive igneous activity from the Coniacian to the early Paleocene as a result of the subduction of a hot and young oceanic slab, such as the Kula-Pacific plate. Finally, the major out-of-sequence thrusts of the Fukase Fault and the Aki Tectonic Line formed after the middle Eocene, and this reactivation of the Shimanto accretionary complex as a result of the subduction of the Pacific plate.

    DOI: 10.1111/iar.12218

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  • Sandstone provenance and U-Pb ages of detrital zircons from Permian-Triassic forearc sediments within the Sukhothai Arc, northern Thailand: Record of volcanic-arc evolution in response to Paleo-Tethys subduction 査読

    Hidetoshi Hara, Miyuki Kunii, Yoshihiro Miyake, Ken-ichiro Hisada, Yoshihito Kamata, Katsumi Ueno, Yoshiaki Kon, Toshiyuki Kurihara, Hayato Ueda, San Assavapatchara, Anuwat Treerotchananon, Thasinee Charoentitirat, Punya Charusiri

    JOURNAL OF ASIAN EARTH SCIENCES   146   30 - 55   2017年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:PERGAMON-ELSEVIER SCIENCE LTD  

    Provenance analysis and U-Pb dating of detrital zircons in Permian-Triassic forearc sediments from the Sulchothai Arc in northern Thailand clarify the evolution of a missing arc system associated with Paleo-Tethys subduction. The turbidite-dominant formations within the forearc sediments include the Permian Ngao Group (Kiu Lom, Pha Huat, and Huai Thak formations), the Early to earliest Late Triassic Lampang Group (Phra That and Hong Hoi formations), and the Late Triassic Song Group (Pha Daeng and Wang Chin formations). The sandstones are quartzose in the Pha Huat, Huai Thak, and Wang Chin formations, and lithic wacke in the Kiu Lom, Phra That, Hong Hoi and Pha Daeng formations. The quartzose sandstones contain abundant quartz, felsic volcanic and plutonic fragments, whereas the lithic sandstones contain mainly basaltic to felsic volcanic fragments. The youngest single-grain (YSG) zircon U-Pb age generally approximates the depositional age in the study area, but in the case of the limestone-dominant Pha Huat Formation the YSG age is clearly older. On the other hand, the youngest cluster U-Pb age (YC1 sigma) represents the peak of igneous activity in the source area. Geological evidence, geochemical signatures, and the YC1 sigma ages of the sandstones have allowed us to reconstruct the Sukhothai arc evolution. The initial Sukhothai Arc (Late Carboniferous Early Permian) developed as a continental island arc. Subsequently, there was general magmatic quiescence with minor I-type granitic activity during the Middle to early Late Permian. In the latest Permian to early Late Triassic, the Sukhothai Arc developed in tandem with Early to Middle Triassic I-type granitic activity, Middle to Late Triassic volcanism, evolution of an accretionary complex, and an abundant supply of sediments from the volcanic rocks to the trench through a forearc basin. Subsequently, the Sukhothai Arc became quiescent as the Paleo-Tethys closed after the Late Triassic. In addition, parts of sediments of supposed Devonian Carboniferous age within the Sukhothai Arc were revised as the Triassic Lampang Group, and the Early Cretaceous Khorat Group.

    DOI: 10.1016/j.jseaes.2017.04.021

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  • RADIOLARIAN AGE AND LITHOSTRATIGRAPHY OF LATE CRETACEOUS PELAGIC SEDIMENTS OVERLYING BASALTIC EXTRUSIVE ROCKS, NORTHERN OMAN MOUNTAINS 査読

    Kousuke Hara, Toshiyuki Kurihara

    OFIOLITI   42 ( 1 )   21 - 38   2017年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:OFIOLITI  

    A detailed radiolarian biostratigraphy of pelagic sediments overlying basaltic extrusive lavas of the Oman Ophiolite is reported for the type locality of the suhaylah Formation near the Wadi Jizzi river, northern Oman Mountains. the extrusive lavas in the studied section are classified as V1 lava produced by mid-ocean-ridge magmatism. the sedimentary succession in the type section (ca. 18 m thick) is subdivided into three units (in stratigraphic order): metalliferous sediments (Unit 1), red mudstone intercalated with radiolarian chert (Unit 2), and micritic limestone (Unit 3).the recovery of well-preserved radiolarians from all units led to the recognition of three distinctive assemblages: Assemblage A, obtained from metalliferous sediments and chert intercalations within red mudstone, could be correlated with the middle-late Cenomanian fauna; Assemblage B, recovered from red mudstone and chert, is assigned to the early Turonian, based on correlation with radiolarian occurrences across the Cenomanian-Turonian boundary; Assemblage C, recognized in micritic limestone, is broadly identified as Turonian-Coniacian.the age of the suhaylah Formation has previously been interpreted as early Cenomanian to Coniacian-Santonian; however, the revised age could be from late Cenomanian to Turonian-Coniacian. the estimated possible maximum age of metalliferous sediments (96.5-93.9 Ma) is in good agreement with high-precision U-Pb zircon dates of ophiolite crust attributed to ridge magmatism. the depositional age of the pelagic sediments clearly indicates that the ridge magmatism had ended by ca. 95.5 Ma.

    DOI: 10.4454/ofioliti.v42i2.446

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  • Polyhedron geometry of skeletons of Mesozoic radiolarian Pantanellium 査読

    Takashi Yoshino, Atsushi Matsuoka, Toshiyuki Kurihara, Naoto Ishida, Naoko Kishimoto, Katsunori Kimoto, Shu Matsuura

    Revue de Micropaleontologie   58 ( 1 )   51 - 56   2015年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Elsevier Masson SAS  

    We considered the geometrical properties of skeletons of the genus Pantanellium, a type of Mesozoic radiolarian. We constructed four 3D models of fossil specimens of Pantanellium, using X-ray Micro-CT and layered manufacturing technology. Focusing on cortical shells, we approximated the skeletal structures with convex polyhedrons and investigated their geometrical properties. We summarized these properties using planar graphs. The geometrical properties differ for fossils that are believed to belong to the same species. The results of numerical simulations based on a mathematical model for spherical radiolarians were partially consistent with the skeletal structures of the specimens. We conclude that the skeletal structure of the genus Pantanellium is not fixed and is not completely optimized from the viewpoint of symmetry.

    DOI: 10.1016/j.revmic.2015.01.002

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  • Three-dimensional imaging of the Jurassic radiolarian Protunuma ? ochiensis Matsuoka: an experimental study using high-resolution X-ray micro-computed tomography 査読

    Naoto ISHIDA, Naoko KISHIMOTO, Atsushi MATSUOKA, Katsunori KIMOTO, Toshiyuki KURIHARA, Takashi YOSHINO

    Volumina Jurassica   13 ( 1 )   77 - 82   2015年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

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  • Pores in Spherical Radiolarian Skeletons Directly Determined from Three-Dimensional Data 査読

    Takashi YOSHINO, Naoko KISHIMOTO, Atsushi MATSUOKA, Naoto ISHIDA, Toshiyuki KURIHARA, Katsunori KIMOTO

    FORMA   29   21 - 27   2014年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.5047/forma.2014.004

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  • U-Pb zircon age from the radiolarian-bearing Hitoegane Formation in the Hida Gaien Belt, Japan 査読

    Manchuk Nuramkhaan, Toshiyuki Kurihara, Kazuhiro Tsukada, Yoshikazu Kochi, Hokuto Obara, Tatsuya Fujimoto, Yuji Orihashi, Koshi Yamamoto

    ISLAND ARC   22 ( 4 )   494 - 507   2013年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:WILEY  

    The dating of radiolarian biostratigraphic zones from the Silurian to Devonian is only partially understood. Dating the zircons in radiolarian-bearing tuffaceous rocks has enabled us to ascribe practical ages to the radiolarian zones. To extend knowledge in this area, radiometric dating of magmatic zircons within the radiolarian-bearing Hitoegane Formation, Japan, was undertaken. The Hitoegane Formation is mainly composed of alternating beds of tuffaceous sandstones, tuffaceous mudstones and felsic tuff. The felsic tuff and tuffaceous mudstone yield well-preserved radiolarian fossils. Zircon grains showing a U-Pb laser ablation-inductively coupled plasma-mass spectrometry age of 426.6 +/- 3.7 Ma were collected from four horizons of the Hitoegane Formation, which is the boundary between the Pseudospongoprunum tauversi to Futobari solidus-Zadrappolus tenuis radiolarian assemblage zones. This fact strongly suggests that the boundary of these assemblage zones is around the Ludlowian to Pridolian. The last occurrence of F.solidus is considered to be Pragian based on the reinterpretation of a U-Pb sensitive high mass-resolution ion microprobe (SHRIMP) zircon age of 408.9 +/- 7.6 Ma for a felsic tuff of the Kurosegawa belt, Southwest Japan. Thus the F.solidus-Z.tenuis assemblage can be assigned to the Ludlowian or Pridolian to Pragian. The present data also contribute to establishing overall stratigraphy of the Paleozoic rocks of the Fukuji-Hitoegane area. According to the Ordovician to Carboniferous stratigraphy in this area, Ordovician to Silurian volcanism was gradually reduced to change the sedimentary environment into a tropical lagoon in the early Devonian. And the quiet Carboniferous environment was subsequently interrupted, throwing it once more into the volcanic conditions in the Middle Permian.

    DOI: 10.1111/iar.12044

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  • Provenance and origins of a Late Paleozoic accretionary complex within the Khangai-Khentei belt in the Central Asian Orogenic Belt, central Mongolia 査読

    Hidetoshi Hara, Toshiyuki Kurihara, Kazuhiro Tsukada, Yoshiaki Kon, Takayuki Uchino, Toshiya Suzuki, Makoto Takeuchi, Yuki Nakane, Manchuk Nuramkhaan, Minjin Chuluun

    JOURNAL OF ASIAN EARTH SCIENCES   75   141 - 157   2013年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:PERGAMON-ELSEVIER SCIENCE LTD  

    We have investigated the petrography, geochemistry, and detrital zircon U-Pb LA-ICPMS dating of sandstone from the Gorkhi Formation of the Khangai-Khentei belt in the Ulaanbaatar area, central Mongolia. These data are used to constrain the provenance and source rock composition of the accretionary complex, which is linked to subduction of the Paleo-Asian Ocean within the Central Asian Orogenic Belt during the Middle Devonian to Early Carboniferous. Field and microscopic observations of the modal composition of sandstone and constituent mineral chemistry indicate that the sandstone of the Gorkhi Formation is feldspathic arenite, enriched in saussuritized plagioclase. Geochemical data show that most of the sandstone and shale were derived from a continental margin to continental island arc setting, with plutonic rocks being the source rocks. Detrital zircon Pb-206/U-238 ages of two sandstones yields age peaks of 322 +/- 3 and 346 +/- 3 Ma. The zircon Pb-206/U-238 age of a quartz-pumpellyite vein that cuts sandstone has a weighted mean age of 339 +/- 3 Ma. Based on these zircon ages, we infer that the depositional age of sandstone within the Gorkhi Formation ranges from 320 to 340 Ma (i.e., Early Carboniferous). The provenance and depositional age of the Gorkhi Formation suggest that the evolution of the accretionary complex was influenced by the intrusion and erosion of plutonic rocks during the Early Carboniferous. We also suggest that spatial and temporal changes in the provenance of the accretionary complex in the Khangai-Khentei belt, which developed aound the southern continental margin of the Siberian Craton in relation to island arc activity, were influenced by northward subduction of the Paleo-Asian Ocean plate. (C) 2013 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.jseaes.2013.07.019

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  • Geological setting of basaltic rocks in an accretionary complex, Khangai-Khentei Belt, Mongolia 査読

    Kazuhiro Tsukada, Yuki Nakane, Koshi Yamamoto, Toshiyuki Kurihara, Shigeru Otoh, Kenji Kashiwagi, Minjin Chuluun, Sersmaa Gonchigdorj, Manchuk Nuramkhaan, Masakazu Niwa, Tetsuya Tokiwa

    ISLAND ARC   22 ( 2 )   227 - 241   2013年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:WILEY  

    We describe the mode of occurrence and geochemical characteristics of basalts, in the KhangaiKhentei belt in Mongolia, overlain by Middle Paleozoic radiolarian chert in an extensive accretionary complex. These basalts are greatly enriched in K, Ti, Fe, P, Rb, Ba, Th, and Nb in comparison to the composition of the mid-ocean ridge basalts, indicative of within-plate alkaline type. Ti/YvsNb/Y and MnO/TiO2/P2O5 ratios of the basalts also suggest within-plate affinities. Considering the geochemical characteristics as well as the conformable relationship with the overlying radiolarian chert, the alkaline basalts were clearly not continental but formed a pelagic oceanic island. The mode of occurrence and geochemistry of the basalts show that the alkaline basaltic volcanic activity had taken place to form an oceanic island in the Paleozoic pelagic region sufficiently far from continents to allow radiolarian ooze accumulation.

    DOI: 10.1111/iar.12028

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  • Tectono-stratigraphy and low-grade metamorphism of Late Permian and Early Jurassic accretionary complexes within the Kurosegawa belt, Southwest Japan: Implications for mechanisms of crustal displacement within active continental margin 査読

    Hidetoshi Hara, Toshiyuki Kurihara, Hiroshi Mori

    TECTONOPHYSICS   592   80 - 93   2013年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER  

    We characterize the tectono-stratigraphic architecture and low-grade metamorphism of the accretionary complex preserved in the Kurosegawa belt of the Kitagawa district in eastern Shikoku, Southwest Japan, in order to understand its internal structure, tectono-metamorphic evolution, and assessments of displacement of continental fragments within the complex. We report the first ever documented occurrence of an Early Jurassic radiolarian assemblage within the accretionary complex of the Kurosegawa belt that has been previously classified as the Late Permian accretionary complex, thus providing a revised age interpretation for these rocks. The accretionary complex is subdivided into four distinct tectono-stratigraphic units: Late Permian melange and phyllite units, and Early Jurassic melange and sandstone units. The stratigraphy of these four units is structurally repeated due to an E-W striking, steeply dipping regional fault. We characterized low-grade metamorphism of the accretionary complex via illite crystallinity and Raman spectroscopy of carbonaceous material. The estimated pattern of low-grade metamorphism showed pronounced variability within the complex and revealed no discernible spatial trends. The primary thermal structure in these rocks was overprinted by later tectonic events. Based on geological and thermal structure, we conclude that continental fragments within the Kurosegawa belt were structurally translated into both the Late Permian and Early Jurassic accretionary complexes, which comprise a highly deformed zone affected by strike-slip tectonics during the Early Cretaceous. Different models have been proposed to explain the initial structural evolution of the Kurosegawa belt ( i.e., micro-continent collision and klippe tectonic models). Even if we presuppose either model, the available geological evidence requires a new interpretation, whereby primary geological structures are overprinted and reconfigured by later tectonic events. (C) 2013 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.tecto.2013.02.006

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  • Unconformity between a Late Miocene-Pliocene accretionary prism (Nishizaki Formation) and Pliocene trench-slope sediments (Kagamigaura Formation), central Japan 査読

    Yuzuru Yamamoto, Shun Chiyonobu, Toshiyuki Kurihara, Asuka Yamaguchi, Shoko Hina, Mari Hamahashi, Hugues Raimbourg, Romain Augier, Leslie Gadenne

    ISLAND ARC   21 ( 4 )   231 - 234   2012年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:WILEY-BLACKWELL  

    DOI: 10.1111/j.1440-1738.2012.00820.x

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  • Application of Voronoi Tessellation of Spherical Surface to Geometrical Models of Skeleton Forms of Spherical Radiolaria 査読

    Takashi Yoshino, Atsushi MATSUOKA, Toshiyuki KURIHARA, Naoto ISHIDA, Naoko KISHIMOTO, Katsunori KIMOTO, Shu MATSUURA

    FORMA   27   45 - 53   2012年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

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  • Petrography and geochemistry of clastic rocks within the Inthanon zone, northern Thailand: Implications for Paleo-Tethys subduction and convergence 査読

    Hidetoshi Hara, Miyuki Kunii, Ken-ichiro Hisada, Katsumi Ueno, Yoshihito Kamata, Weerapan Srichan, Punya Charusiri, Thasinee Charoentitirat, Megumi Watarai, Yoshiko Adachi, Toshiyuki Kurihara

    JOURNAL OF ASIAN EARTH SCIENCES   61   2 - 15   2012年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:PERGAMON-ELSEVIER SCIENCE LTD  

    The provenance, source rock compositions, and sediment supply system for a convergence zone of the Paleo-Tethys were reconstructed based on the petrography and geochemistry of clastic rocks of the Inthanon Zone, northern Thailand. The clastic rocks are classified into two types based on field and microscopic observations, the modal composition of sandstone, and mineral compositions: (I) lithic sandstone and shale within melange in a Permo-Triassic accretionary complex; and (2) Carboniferous quartzose sandstone and mudstone within the Sibumasu Block. Geochemical data indicate that the clastic rocks of the melange were derived from continental island arc and continental margin settings, which correspond to felsic volcanic rocks within the Sukhothai Zone and quartz-rich fragments within the Indochina Block, respectively. The results of a mixing model indicate the source rocks were approximately 35% volcanic rocks of the Sukhothai Zone and 65% craton sandstone and upper continental crust of the Indochina Block. In contrast, Carboniferous quartzose sedimentary rocks within the Sibumasu Block originated from a continental margin, without a contribution from volcanic rocks. In terms of Paleo-Tethys subduction, a continental island arc in the Sukhothai Zone evolved in tandem with Late Permian-Triassic forearc basins and volcanic activity during the Middle-early Late Triassic. The accretionary complex formed contemporaneously with the evolution of continental island arc during the Permo-Triassic, supplied with sediment from the Sukhothai Zone and the Indochina Block. (C) 2012 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.jseaes.2012.06.012

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  • Exact number of pore frames and their configuration in the Mesozoic radiolarian Pantanellium: An application of X-ray micro-CT and layered manufacturing technology to micropaleontology 査読

    Atsushi Matsuoka, Takashi Yoshino, Naoko Kishimoto, Naoto Ishida, Toshiyuki Kurihara, Katsunori Kimoto, Shu Matsuura

    MARINE MICROPALEONTOLOGY   88-89   36 - 40   2012年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

    Nylon models of earliest Cretaceous Pantanellium were produced from a real fossil specimen by applying X-ray micro-CT and layered manufacturing technology. These models enable us to elucidate the exact number of polygonal pore frames and their configuration on the cortical shell, which is difficult to recognize from scanning electron microscope or light microscope images. The specimen has a total number of 27 polygonal (12 pentagonal and 15 hexagonal) pore frames. The pore frame number and the configuration are important criteria in the taxonomy of the Family Pantanelliidae. Planar graphs showing the distribution of polygonal pore frames on the cortical shell are depicted. They are expected to be a standard method for presenting and examining geometrical characters of pantanellid cortical shells. The new technology of X-ray micro-CT can shed light on detailed morphological examinations of not only radiolarians but also any other microfossils. (C) 2012 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.marmicro.2012.02.005

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  • Permian Peri-glacial Deposits from Central Mongolia in Central Asian Orogenic Belt: A Possible Indicator of the Capitanian Cooling Event 査読

    Tatsuya Fujimoto, Shigeru Otoh, Yuji Orihashi, Takafumi Hirata, Takaomi D. Yokoyama, Masanori Shimojo, Yoshikazu Kouchi, Hokuto Obara, Yasuo Ishizaki, Kazuhiro Tsukada, Toshiyuki Kurihara, Manchuk Nuramkhan, Sersmaa Gonchigdorj

    RESOURCE GEOLOGY   62 ( 4 )   408 - 422   2012年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:WILEY  

    A dropstone-bearing, Middle Permian to Early Triassic peri-glacial sedimentary unit was first discovered from the KhangaiKhentei Belt in Mongolia, Central Asian Orogenic Belt. The unit, Urmegtei Formation, is assumed to cover the early Carboniferous KhangaiKhentei accretionary complex, and is an upward-fining sequence, consisting of conglomerates, sandstones, and varved sandstone and mudstone beds with granite dropstones in ascending order. The formation was cut by a felsic dike, and was deformed and metamorphosed together with the felsic dike. An undeformed porphyritic granite batholith finally cut all the deformed and metamorphosed rocks. LA-ICP-MS, UPb zircon dating has revealed the following 206Pb/238U weighted mean igneous ages: (i) a granite dropstone in the Urmegtei Formation is 273 +/- 5?Ma (Kungurian of Early Permian); (ii) the deformed felsic dike is 247 +/- 4?Ma (Olenekian of Early Triassic); and (iii) the undeformed granite batholith is 218 +/- 9?Ma (Carnian of Late Triassic). From these data, the age of sedimentation of the Urmegtei Formation is constrained between the Kungurian and the Olenekian (273-247?Ma), and the age of deformation and metamorphism is constrained between the Olenekian and the Carnian (247-218?Ma). In Permian and Triassic times, the global climate was in a warming trend from the Serpukhovian (early Late Carboniferous) to the Kungurian long and severe cool mode (328-271?Ma) to the Roadian to Bajocian (Middle Jurassic) warm mode (271168 Ma), with an interruption with the Capitanian Kamura cooling event (266-260 Ma). The dropstone-bearing strata of the Urmegtei Formation, together with the glacier-related deposits in the Verkhoyansk, Kolyma, and Omolon areas of northeastern Siberia (said to be of Middle to Late Permian age), must be products of the Capitanian cooling event. Although further study is needed, the dropstone-bearing strata we found can be explained in two ways: (i) the Urmegtei Formation is an autochthonous formation indicating a short-term expansion of land glacier to the central part of Siberia in Capitanian age; or (ii) the Urmegtei Formation was deposited in or around a limited ice-covered continent in northeast Siberia in the Capitanian and was displaced to the present position by the Carnian.

    DOI: 10.1111/j.1751-3928.2012.00204.x

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  • Direct age determination for an Upper Permian accretionary complex (Kirinai Formation), Kitakami Mountains, Northeast Japan 査読

    Satoshi Nakae, Toshiyuki Kurihara

    Palaeoworld   20 ( 2-3 )   146 - 157   2011年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    This study presents the first direct age determination for the Kirinai Formation in the Kitakami Mountains, Northeast Japan, and a new model that correlates the Kirinai Formation with Upper Permian accretionary complexes of the Ultra-Tamba belt, Southwest Japan. The correlation is based on similarities in lithology, age, and structural relationships. The Kitakami Mountains are geotectonically divided into several belts, with subduction-related complexes occurring in the North Kitakami and Nedamo belts, whereas Ordovician ophiolites and stratigraphically overlying Paleozoic-Mesozoic sedimentary sequences are respectively exposed in the so-called " Hayachine tectonic belt" and South Kitakami belt. The Kirinai Formation, previously thought to belong to the North Kitakami belt, is tectonically underlain by the Jurassic Kamaishi and Tassobeguchi formations of the North Kitakami belt, and is overlain by the Lower Carboniferous Nedamo Complex of the Nedamo belt. The Kirinai Formation is lithostratigraphically subdivided into three members: a lower member dominated by black phyllitic mudstone with minor amount of bedded siliceous mudstone, a middle member consisting mainly of greenish gray massive sandstone and phyllitic mudstone, and an upper member composed of phyllitic mudstone locally intercalated with felsic tuff. The radiolarian fauna obtained from the lower member includes age-diagnostic species such as Follicucullus sp. cf. F. dilatatus Rudenko and Albaillella sp. cf. A. protolevis Kuwahara, corresponding to the interval from the Neoalbaillella ornithoformis Assemblage Zone to the lower part of the Neoalbaillella optima Assemblage Zone of Kuwahara et al. (1998). These findings indicate a Changhsingian (Upper Permian) assignment for the lower member of the Kirinai Formation. This newly obtained age and the obtained correlations provide the key to understanding the original relationships among the various subduction-related complexes in Japan. © 2010 Elsevier Ltd and Nanjing Institute of Geology and Palaeontology, CAS.

    DOI: 10.1016/j.palwor.2010.12.003

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  • Direct observation of the skeletal growth patterns of polycystine radiolarians using a fluorescent marker 査読

    Kaoru Ogane, Akihiro Tuji, Noritoshi Suzuki, Atsushi Matsuoka, Toshiyuki Kurihara, Rie S. Hori

    MARINE MICROPALEONTOLOGY   77 ( 3-4 )   137 - 144   2010年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

    Skeletogenesis in polycystine radiolarians was detected, using a fluorescent compound called PDMPO (2-(4-pyridyl)-5-[(4-(2-dimethylaminoethylaminocarbamoyl)methoxy)-phenyl] oxazole). This compound binds under acidic conditions with silica in the silica deposition vesicle (SDV) of radiolarians, and only newly added silica emits a green fluorescence under ultraviolet light. We used cells fixed with formaldehyde of two species of spherical Spumellaria (Hexacontium philosophica and Rhizosphaera trigonacantha) and three species of cyrtid Nassellaria (Anthocyrtidium angulare, Clathrocyclas (?) cassiopeiae, and Lophophaena hispida), in which green fluorescence occurred in the entire skeleton outside the endoplasm. In contrast, the conical nassellarian species Eucyrtidium hexagonatum emitted green fluorescence only on the cephalo-thorax-abdominal part of the skeleton, and on part of the inner ring at the segmental suture, and the margins of pores, suggesting partial biological silicification. Two flat spumellarian species (Dictyocoryne profunda and Rhopalastrum elegans) showed bright green fluorescence over the full skeleton in some cells, but other cells did not fluoresce at all, even though young cells in good condition were tested, suggesting that intermittent growth occurs in these species, as known from a controlled incubation experiment. We did not observe development of new skeletons, but "skeletal thickening growth" (STG), defined as silica deposition over the surface of an existing skeleton, occurred to varying degrees in the polycystines, and may result in the formation of lamellar structures, as observed in sectioned skeletons of polycystines. (C) 2010 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.marmicro.2010.08.005

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  • Geological and geochemical aspects of a Devonian siliceous succession in northern Thailand: Implications for the opening of the Paleo-Tethys 査読

    Hidetoshi Hara, Toshiyuki Kurihara, Junichiro Kuroda, Yoshiko Adachi, Hiroshi Kurita, Koji Wakita, Ken-ichiro Hisada, Punya Charusiri, Thasinee Charoentitirat, Pol Chaodumrong

    PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY   297 ( 2 )   452 - 464   2010年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

    The opening of the Paleo-Tethys are reconstructed, including the depositional setting and redox conditions, based on an analysis of radiolarian fossils and the geochemistry of a Devonian siliceous succession in the Chiang Dao area of northern Thailand. The succession is subdivided into the following five rock types (in ascending stratigraphic order): black shale (Lower Devonian), siliceous shale (Middle Devonian), tuffaceous chert and tuff (Middle/Upper Devonian), and chert (Upper Devonian). The succession was deposited in continental margin and pelagic environments between the Sibumasu Block and the Indochina-North China blocks. The concentrations of terrestrial-derived elements (Al2O3, TiO2, Rb, and Zr) suggest that the succession (except for the chert) was supplied with terrigenous material and volcanic ash from the adjacent continent, deposited within a SiO2-rich environment. Geochemical indicators of redox conditions (total organic carbon and the Th/U ratio) reveal a gradual change from anoxic to oxic oceanic conditions between the black shale and chert. Taking into account the interpreted depositional setting and redox conditions, the initial Paleo-Tethys developed as a small, closed anoxic-suboxic oceanic basin during the Early to Middle Devonian, located close to the continental margin. Black shale and siliceous shale were deposited in the basin at this time. Opening of the Paleo-Tethys started around the Middle and Upper Devonian boundary, marked by voluminous volcanic activity. The tuffaceous chert was deposited under oxic conditions, suggesting that ash and pumice within the chert were derived from a continental source. After the Late Devonian, the Paleo-Tethys developed as a deep, broad ocean in which pelagic chert was deposited. (C) 2010 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.palaeo.2010.08.029

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  • A Simple Mathematical Model for Chamber Arrangement of Planktic Foraminifera

    Takashi Yoshino, Katsunori Kimoto, Naoko Kishimoto, Atsushi Matsuoka, Toshiyuki Kurihara, Naoto Ishida, Syu Matsuura

    FORMA   24 ( 3 )   87 - 92   2010年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

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  • Tectonic evolution of low-grade metamorphosed rocks of the Cretaceous Shimanto accretionary complex, Central Japan 査読

    Hidetoshi Hara, Toshiyuki Kurihara

    TECTONOPHYSICS   485 ( 1-4 )   52 - 61   2010年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER  

    We reconstructed the tectono-metamorphic evolution of the low-grade metamorphosed Cretaceous Shimanto accretionary complex in the Kanto Mountains, Central Japan, based on radiolarian fossils, metamorphic temperatures derived from illite crystallinity analysis, and timing of metamorphism based on illite K-Ar dating. The accretionary age of the Kobotoke Group is Turonian to Maastrichtian (66-94 Ma), based on radiolarian fossils. Illite crystallinity data indicate metamorphic temperatures of approximately 300 degrees C. The illite K-Ar ages constrain the timing of metamorphism to the Middle Eocene around 40 Ma. Combining our results and previous study, we defined two types of low-grade metamorphism within Cretaceous Shimanto accretionary complex of the Kanto Mountains. The early metamorphism, in excess of 300 degrees C, was related to the uplift of the Sambagawa metamorphic rocks, in turn associated with the subduction of the Kula-Pacific ridge during the Late Cretaceous (65-75 Ma). This metamorphism is recorded in the Otaki Group within the northernmost part of the complex in the Kanto Mountains. Subsequent to the subduction of the Kula-Pacific ridge, a later period of metamorphism, recorded in the Kobotoke Group, is characterized by the thermal effects of the subduction of the young, hot Pacific Plate during the Middle Eocene. The effect of the early metamorphism occurred synchronously 500 km along the trench from Southwest to Central Japan. The later metamorphism occurred at 50 Ma in Kyushu and Shikoku of Southwest Japan, and at 40 Ma in the Kanto Mountains of Central Japan. This difference in the timing of metamorphism between Southwest and Central Japan is explained by the northward migration of the young, hot Pacific Plate. (C) 2009 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.tecto.2009.11.017

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  • Sporogenesis of an extracellular cell chain from the spheroidal radiolarian host Haliommilla capillaceum (Haeckel), Polycystina, Protista 査読

    Noritoshi Suzuki, Toshiyuki Kurihara, Atsushi Matsuoka

    MARINE MICROPALEONTOLOGY   72 ( 3-4 )   157 - 164   2009年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

    We present the first record of a living solitary spherical polycystine radiolarian, Haliommilla capillaceum (Haeckel), with a chain of extracellular cells. The extracellular cells divided seven times over about 4 h from the 8-cell to the 1024-cell stage and then swam away. At the 1024-cell stage the cells were very small, isospores (ca. 12 mu m in length). After final cytokinesis, the cells remained essentially immobile, with only occasional movement. After this immobile stage, they abruptly swam out in a burst into seawater. The cell division patterns and cell shape are similar to the sporogenesis of the host-specific parasitic dinoflagellate Duboscquella sp. infecting a tintinnid. Precise identification, however, needs molecular analysis, transmitted scanning images and proliferation test. (C) 2009 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.marmicro.2009.04.007

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  • Upper Silurian and Devonian pelagic deep-water radiolarian chert from the Khangai-Khentei belt of Central Mongolia: Evidence for Middle Paleozoic subduction-accretion activity in the Central Asian Orogenic Belt 査読

    Toshiyuki Kurihara, Kazuhiro Tsukada, Shigeru Otoh, Kenji Kashiwagi, Minjin Chuluun, Dorjsuren Byambadash, Bujinlkham Boijir, Sersmaa Gonchigdorj, Manchuk Nuramkhan, Masakazu Niwa, Tetsuya Tokiwa, Gen'ya Hikichi, Takafumi Kozuka

    JOURNAL OF ASIAN EARTH SCIENCES   34 ( 2 )   209 - 225   2009年2月

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    記述言語:英語   出版者・発行元:PERGAMON-ELSEVIER SCIENCE LTD  

    Recent mapping projects undertaken in Central Mongolia have revealed the widespread occurrence of radiolarian chert within a Paleozoic accretionary complex. We present the results of the first detailed tectonostratigraphic and radiolarian biostratigraphic investigations of the Gorkhi Formation in the Khangai-Khentei belt of the Central Asian Orogenic Belt.The Gorkhi Formation consists of sandstone shale, alternating sandstone and shale of turbidite affinity and chert with small amounts of siliceous shale, basalt, limestone, and clast-bearing mudstone. Radiolarian chert that is completely devoid of terrigenous clastic material is commonly associated with underlying basalt (sedimentary contact) and with conformably overlying siliceous shale and turbidite deposits. The tectonic stacking of basalt-chert and chert-turbidite successions is the most remarkable structural feature of the formation.The recovery of moderately well-preserved radiolarians and conodonts from red chert led to the recognition Of four radiolarian assemblages that have a combined age range from the latest Silurian (Pridolian) to the Late Devonian (Frasnian). No age control exists for the siliceous shale, shale, and sandstone, although they are considered to be latest Devonian or slightly younger on the basis of stratigraphic relationships with underlying chert.The Gorkhi Formation has previously been interpreted as a thick sedimentary basin deposit overlying an unexposed Archean-Neoproterozoic basement; however. the stratigraphy within individual tectonic slices clearly corresponds to that of an ocean plate stratigraphy of an accretionary complex generated by the trenchward movement of an oceanic plate. From the lowermost to uppermost units, the stratigraphy comprises ocean floor basalt, pelagic deep-water radiolarian chert, hemipelagic siliceous shale, and terrigenous turbidite deposits. The biostratigraphic data obtained in the present study provide corroborating evidence for the existence of an extensive deep-water ocean that enabled the continuous sedimentation of pelagic chert over a period of nearly 50 million years. These data, together with structural data characterized by tectonic repetition of the stratigraphy, indicate that these rocks formed as an accretionary wedge along an active continental margin, possibly that of the Angara Craton. The mid-oceanic chert was probably deposited in the Northern Hemisphere portion of the Pateo-Pacific Ocean that faced the Angara Craton and the North China-Tarim blocks. Thus, We propose that subduction-accretion processes along the Paleo-Pacific rim played an important role in the accretionary growth of the active continental margin of the Angara Craton, directly influencing the evolution of the Central Asian Orogenic Belt. (C) 2008 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.jseaes.2008.04.010

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  • First application of PDMPO to examine silicification in polycystine radiolaria

    Kaoru Ogane, Akihiro Tuji, Noritoshi Suzuki, Toshiyuki Kurihara, Atsushi Matsuoka

    Plankton and Benthos Research   4 ( 3 )   89 - 94   2009年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    2-(4-pyridyl)-5-[(4-(2-dimethylaminoethylaminocarbamoyl)methoxy)-phenyl] oxazole (PDMPO) is a fluorescent compound that accumulates in acidic cell compartments. PDMPO is accumulated with silica under acidic conditions, and the newly developed silica skeletons show green fluorescent light. This study is the first to use PDMPO in polycystine radiolarians, which are unicellular planktonic protists. We tested Acanthodesmia sp., Rhizosphaera trigonacantha, and Spirocyrtis scalaris for emission of green fluorescence. Entire skeletons of Acanthodesmia sp. and Sr. scalaris emitted green fluorescent light, whereas only the outermost shell and radial spines of Rz. trigonacantha showed fluorescence. Two additional species, Spongaster tetras tetras and Rhopalastrum elegans did not show fluorescence. Green fluorescence of the entire skeleton is more like the "skeletal thickening growth" defined by silica deposition throughout the surface of the existing skeleton. The brightness of the fluorescence varied with each cell. This difference in fluorescence may reflect the rate of growth in these cells. Green fluorescence in PDMPO-treated polycystines suggests the presence of similar metabolic systems with controlled pH. The results of this study shed light not only on the feasibility of using PDMPO in diatoms and siliceous sponges, but also in polycystines. Further application of PDMPO could refine polycystine skeletogenic hypotheses and offer new insight on the physiological functions of silica assimilation. © The Plankton Society of Japan.

    DOI: 10.3800/pbr.4.89

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  • Radiolaria-dated Lower Permian clastic-rock sequence in the Fukuji area of the Hida-gaien terrane, central Japan, and its inter-terrane correlation across Southwest Japan 査読

    Toshiyuki Kurihara, Masao Kametaka

    ISLAND ARC   17 ( 4 )   531 - 545   2008年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:WILEY-BLACKWELL  

    The stratigraphy and radiolarian age of the Mizuyagadani Formation in the Fukuji area of the Hida-gaien terrane, central Japan, represent those of Lower Permian clastic-rock sequences of the Paleozoic non-accretionary-wedge terranes of Southwest Japan that formed in island arc-forearc/back-arc basin settings. The Mizuyagadani Formation consists of calcareous clastic rocks, felsic tuff, tuffaceous sandstone, tuffaceous mudstone, sandstone, mudstone, conglomerate, and lenticular limestone. Two distinctive radiolarian faunas that are newly reported from the Lower Member correspond to the zonal faunas of the Pseudoalbaillella u-forma morphotype I assemblage zone to the Pseudoalbaillella lomentaria range zone (Asselian to Sakmarian) and the Albaillella sinuata range zone (Kungurian). In spite of a previous interpretation that the Mizuyagadani Formation is of late Middle Permian age, it consists of Asselian to Kungurian tuffaceous clastic strata in its lower part and is conformably overlain by the Middle Permian Sorayama Formation. An inter-terrane correlation of the Mizuyagadani Formation with Lower Permian tuffaceous clastic strata in the Kurosegawa terrane and the Nagato tectonic zone of Southwest Japan indicates the presence of an extensive Early Permian magmatic arc(s) that involved almost all of the Paleozoic non-accretionary-wedge terranes in Japan. These new biostratigraphic data provide the key to understanding the original relationships among highly disrupted Paleozoic terranes in Japan and northeast Asia.

    DOI: 10.1111/j.1440-1738.2008.00632.x

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  • Uppermost silurian to lower devonian radiolarians from the hitoegane area of the hida-gaien terrane, central Japan 査読

    Toshiyuki Kurihara

    MICROPALEONTOLOGY   53 ( 3 )   221 - 237   2007年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:MICROPALEONTOLOGY PRESS  

    Two distinctive uppermost Silurian to Lower Devonian radiolarian assemblages, the Pseudospongoprunum tauversi Assemblage and the Futobari solidus-Zadrappolus tenuis Assemblage, occur in new localities of felsic tuffaceous strata in the Hitoegane area of the Hida-gaien terrane of central Japan. The first is characterized by the presence of P. tauversi and diverse inaniguttids, which can be correlated with the well-constrained Pridolian radiolarian zonal fauna defined in west Texas. The second occurs stratigraphically above beds containing the P. tauversi Assemblage and in strata correlative to beds from which a probably Lower Devonian flora has been recovered. These occurrences indicate that the F. solidus-Zadrappolus tenuis Assemblage ranges from uppermost Silurian to Lower Devonian. Based on the stratigraphic context for the underlying Pridolian P. tauversi Assemblage, the probably Lower Devonian flora, and the reinterpretation of the previously dated zircon U/Pb age, the F. solidus-Z. tenuis Assemblage is the first confirmed radiolarian assemblage from the lowermost Devonian. Previous workers have suggested that entactimid radiolarians became increasingly dominant in the latest Silurian to Early Devonian, but the present study shows that inaniguttids such as Futobari and Zadrappolus were dominant in the early to probably middle Early Devonian. A new inaniguttid species is described: Zodrappolus (?) nudus n. sp.

    DOI: 10.2113/gsmicropal.53.3.221

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  • O-134 モンゴル中央部ハンガイーヘンティ帯ゴルヒ層の放散虫化石群集とチャートの地質時代(14.テクトニクス,口頭およびポスター発表,一般講演) 査読

    栗原 敏之, 常盤 哲也, 引地 原野, 小塚 隆文, 東田 和弘, 大藤 茂, 柏木 健司, Minjin Ch., Sersmaa G., Dorjsuren B., Bujinlkham B., 丹羽 正和

    日本地質学会学術大会講演要旨   2006 ( 0 )   110 - 110   2006年

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    記述言語:日本語   出版者・発行元:一般社団法人 日本地質学会  

    DOI: 10.14863/geosocabst.2006.0_110_1

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  • O-135 モンゴル中部ハンガイ : ヘンテイ帯、ゴルヒ層の玄武岩化学組成について(14.テクトニクス,口頭およびポスター発表,一般講演) 査読

    束田 和弘, 小塚 隆文, Minjin C., Sersmaa G., Dorjsuren B., Boijir B., 栗原 敏之, 浅原 良治, 丹羽 耕輔, 常磐 哲也, 丹羽 正和, 大藤 茂, 柏木 健司, 引地 原野

    日本地質学会学術大会講演要旨   2006 ( 0 )   110 - 110   2006年

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    記述言語:日本語   出版者・発行元:一般社団法人 日本地質学会  

    DOI: 10.14863/geosocabst.2006.0_110_2

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  • モンゴル中央部ヘンテイ山地の赤色チャートから産出したデボン紀放散虫化石とその意義 : "パレオパシフィック海"の海洋プレート層序の復元に向けて(16.テクトニクス) 査読

    栗原 敏之, 束田 和弘, 柏木 健司, Minjin Chuluun, Byambadash Dorjsuren, 丹羽 正和, 常盤 哲也

    日本地質学会学術大会講演要旨   2005 ( 0 )   133 - 133   2005年

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    記述言語:日本語   出版者・発行元:一般社団法人 日本地質学会  

    DOI: 10.14863/geosocabst.2005.0_133_2

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書籍等出版物

  • ジオパーク : 大学から地域へ、そして世界へ

    松岡, 篤, 栗原, 敏之, 新潟大学大学院自然科学研究科ブックレット新潟大学編集委員会

    新潟日報事業社  2013年  ( ISBN:9784861325281

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    総ページ数:70p   記述言語:日本語

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MISC

  • 中生代放散虫 Pantanellium の外層殻にみられる殻孔の配列様式とその多様性

    松岡 篤, 吉野 隆, 栗原 敏之, 石田 直人, 木元 克典, 岸本 直子, 松浦 執

    形の科学会誌 = Bulletin of the Society for Science on Form   24 ( 2 )   160 - 161   2009年11月

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    記述言語:日本語  

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  • 浮遊性有孔虫の幾何モデリング : 口孔 (Aperture) の実装と分類学的考察

    木元 克典, 吉野 隆, 岸本 直子, 松岡 篤, 栗原 敏之, 石田 直人, 松浦 執

    形の科学会誌 = Bulletin of the Society for Science on Form   24 ( 2 )   164 - 166   2009年11月

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    記述言語:日本語  

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  • 中生代放散虫 Pantanellium の外層殻にみられる殻孔の幾何学

    吉野 隆, 松岡 篤, 栗原 敏之, 石田 直人, 木元 克典, 岸本 直子, 松浦 執

    形の科学会誌 = Bulletin of the Society for Science on Form   24 ( 1 )   35 - 36   2009年6月

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    記述言語:日本語  

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  • 中生代放散虫 Pantanellium の外層殻にみられる殻孔の配列様式

    松岡 篤, 吉野 隆, 栗原 敏之, 石田 直人, 木元 克典, 岸本 直子, 松浦 執

    形の科学会誌 = Bulletin of the Society for Science on Form   24 ( 1 )   33 - 34   2009年6月

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    記述言語:日本語  

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  • 浮遊性有孔虫チャンバー形成モデル : その1 : モデルと実装

    吉野 隆, 木元 克典, 岸本 直子, 松岡 篤, 栗原 敏之, 松浦 執, 石田 直人

    形の科学会誌 = Bulletin of the Society for Science on Form   23 ( 1 )   75 - 76   2008年6月

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    記述言語:日本語  

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  • 球形放散虫骨格生成のための凸多面体形成

    吉野 隆, 松岡 篤, 栗原 敏之, 岸本 直子, 木元 克典, 松浦 執, 石田 直人

    形の科学会誌 = Bulletin of the Society for Science on Form   23 ( 1 )   73 - 74   2008年6月

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    記述言語:日本語  

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  • Permian radiolarian faunas from chert in the Khabarovsk Complex, Far East Russia, and the age of each lithologic unit of the Khabarovsk Complex

    Noritoshi Suzuki, Satoru Kojima, Harumasa Kano, Satoshi Yamakita, Akihiro Misaki, Masayuki Ehiro, Shigeru Otoh, Toshiyuki Kurihara, Masashi Aoyama

    Journal of Paleontology   79 ( 4 )   687 - 701   2005年7月

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    記述言語:英語   掲載種別:書評論文,書評,文献紹介等  

    The Khabarovsk Complex, a Jurassic accretionary complex distributed in and around the Khabarovsk city area, Far East Russia, comprises mélange and schist facies. From the review of previous studies including Russian papers, the lithology and age of the constituent rocks of the mélange facies can be summarized as follows: Upper Paleozoic basic volcanic rocks, mainly pillow lava, and altered gabbro, Upper Carboniferous to Upper Permian fusulinoidean-bearing limestone associated with tuff, Lower and Middle Jurassic siliceous mudstone, Upper Jurassic tuffaceous mudstone, uppermost Jurassic carbonate concretions embedded in mudstone, and age-unknown sandstone. Newly found sequences of limestone-chert and of basalt-chert in the mélange facies crop out along the Amur River in the Khabarovsk city area. A chert sample of the limestone-chert sequence contains Albaillella aff. asymmetrica and Pseudoalbaillella aff. lomentaria, and a chert sample of the basalt-chert sequence includes Follicucullus monacanthus, Follicucullus porrectus, and Pseudoalbaillella cf. yanaharaensis. The radiolarian assemblages from the limestone-chert and basalt-chert sequences have a maximum age of middle Early Permian and late Middle Permian, respectively, overlapping the time of deposition of the fusulinoidean-bearing limestone. The co-occurrence of chert and limestone indicates that the fusulinoidean-bearing limestone was formed on a basaltic topographic high in a pelagic ocean whereas the radiolarians accumulated in a deeper part. Limestone debris occasionally flowed into the depositional site of the radiolarian chert. Although the Khabarovsk Complex was simply considered as a northern extension of the Mino-Tamba Belt of the Inner Zone of southwest Japan, we propose a new correlation based on the lithologic associations. The mélange facies of the Khabarovsk Complex is correlative with one of the Kasugano, Funabuseyama, Nabi, and Yabuhara Formations in the Mino-Tamba Belt, whereas the schist facies is correlative with the Hikami Formation of the Ultra-Tamba Belt. Copyright © 2005, The Paleontological Society.

    DOI: 10.1666/0022-3360(2005)079[0687:PRFFCI]2.0.CO;2

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共同研究・競争的資金等の研究

  • 中・古生代放散虫生層序とU-Pb年代の統合:年代尺度としての確立と応用

    研究課題/領域番号:17K05690  2017年4月 - 2020年3月

    日本学術振興会  科学研究費助成事業 基盤研究(C)  基盤研究(C)

    栗原 敏之, 植田 勇人, 松岡 篤

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    配分額:4420000円 ( 直接経費:3400000円 、 間接経費:1020000円 )

    本課題では,放散虫化石帯にジルコンのU-Pb年代を挿入し,他の生層序帯や地質現象を統一的な時間軸上に配列できる年代尺度として確立することを目的として研究を行っている.平成30年度は,交付申請書の実施計画に則り,次の検討を行った.(1)飛騨外縁帯・黒瀬川帯・南部北上帯の上部シルル系~下部デボン系放散虫化石帯における主要な生層準の年代の検討.(2)飛騨外縁帯・黒瀬川帯・舞鶴帯のペルム紀放散虫化石産出層における年代の検討.(3)ジュラ紀・白亜紀放散虫化石産出層における年代の検討.
    (1)では,特に黒瀬川帯の鴻ノ森地域・横倉山地域における上部シルル系~下部デボン系にて既存の放散虫化石帯を詳細に再検討し,重要な生層準を新たに認定するとともに,複数層準の凝灰岩からジルコンの抽出を進めた.(2)では,特に佐渡島に分布する舞鶴帯舞鶴層群相当層において,ペルム紀の放散虫化石産出層を新たに見出し,随伴する複数の砂岩層においてジルコンのU-Pb年代を測定した.個々のジルコン粒子の組織や形状の評価とともにピーク分離等の統計学的手法を用い,信頼度の高い堆積年代値として約268~255 Maの年代値を得ることができた.これにより中期ペルム紀Capitanianの放散虫化石帯に年代値を導入できる見通しが得られた.(3)では,前期白亜紀の放散虫化石が産出する富良野地域の蝦夷層群において研究分担者(植田勇人)とともに地質調査を行い,地質の把握,放散虫生層序の再検討および凝灰岩のジルコンU-Pb年代の測定を進めた.また,ジュラ紀-前期白亜紀境界付近については,福島県南相馬地域に分布する相馬中村層群にて研究分担者(松岡 篤)とともに地質調査を行い,放散虫の重要な生層準の確認と凝灰岩からのジルコンの抽出を進めた.

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  • 絶滅した放散虫の生息深度分布-浅海/深海堆積物の群集比較と形態収斂からの推定

    研究課題/領域番号:26400499  2014年4月 - 2017年3月

    日本学術振興会  科学研究費助成事業 基盤研究(C)  基盤研究(C)

    栗原 敏之, 野田 篤, 原 英俊, 原 康祐

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    配分額:2600000円 ( 直接経費:2000000円 、 間接経費:600000円 )

    本研究は,後期白亜紀の放散虫化石群集から種毎の深度棲み分けの識別を行うことを目的として,日本(和泉層群・蝦夷層群)とオマーン(スヘイラ層・ザビアト層)の浅海・深海堆積物を対象に,群集の種構成差異の比較を行った.その結果,浅海堆積物には大型の平板状Spumellariaが卓越すること,および水塊構造の発達に伴う特徴的な種群の占有を確認した.また,表層種と判断された種群は,現生の表層生息種と同様な形態的特徴を有しており,生息環境への適応戦略としての形態収斂であることを示唆する.以上の結果は,化石群集から深度棲み分けの識別が可能であることを示す.

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  • 砕屑岩岩石学から復元する黒瀬川帯ペルム紀島弧の進化過程

    研究課題/領域番号:26400495  2014年4月 - 2017年3月

    日本学術振興会  科学研究費助成事業 基盤研究(C)  基盤研究(C)

    原 英俊, 平野 美帆, 植田 勇人, 高橋 俊郎, 野原 里華子, 栗原 敏之

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    配分額:2600000円 ( 直接経費:2000000円 、 間接経費:600000円 )

    ペルム紀は日本列島(島弧)の原型をもたらした初期にあたる.しかし当時発達していた島弧の主部をなす火山岩や花崗岩などの多くは,すでに削剥され見ることはできない.そこで,現在でも残されているペルム紀の付加体及び浅海性層の砕屑岩に着目し,その後背地の解析(砂岩組成・化学組成・砕屑性ジルコンU-Pb年代)を行った.そして,砕屑岩に保存されていた後背地の記録より,ペルム紀島弧の情報を読み取り,日本列島のはじまりを復元した.

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  • 中期古生代の放散虫絶滅事変:種群交代と環境要因から探るプランクトン生態系の変革

    研究課題/領域番号:23740376  2011年 - 2012年

    日本学術振興会  科学研究費助成事業 若手研究(B)  若手研究(B)

    栗原 敏之

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    配分額:3770000円 ( 直接経費:2900000円 、 間接経費:870000円 )

    本研究では,前期デボン紀における絶滅を伴った放散虫の変遷過程を明らかにすることを目的として,日本とモンゴルの珪質岩を対象に群集組成の変化と時間スケール,環境要因を検討した.その結果,前期デボン紀中頃と推定されるInaniguttidae科の衰退期には,生存期間の短い日和見種が現れ,その後に中期デボン紀以降繁栄するEntactiniidae科の卓越する群集に移行していくことが明らかになった.モンゴルのチャートの化学組成の検討から,この絶滅現象は,大規模火成活動に伴う環境変動と因果関係がある可能性がある.

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  • マルチスケールデザイン学の構築 : 有殻原生生物の進化解明から宇宙構造物の設計まで

    研究課題/領域番号:21200053  2009年 - 2011年

    日本学術振興会  科学研究費助成事業 新学術領域研究(研究課題提案型)  新学術領域研究(研究課題提案型)

    岸本 直子, 吉野 隆, 木元 克典, 栗原 敏之, 石田 直人, 松岡 篤, 松浦 執, 目黒 在, 名取 通弘, 小川 泰

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    配分額:17680000円 ( 直接経費:13600000円 、 間接経費:4080000円 )

    本研究では,有殻原生生物骨格形態の幾何学的・力学的特性を抽出し,無重力下での最適構造を探索してきた.本研究期間で得られた成果は,以下の3点である.1)ほとんどすべての有孔虫と放散虫骨格の化石ならびに原生種の3次元形状計測が可能となった.2)有孔虫について,チェンバーの付加成長による数理モデルを構築し,実際の3次元形状からモデルのパラメータ同定を実施し,沈降速度の推定と検証をおこなった.3)放散虫について,3次元形状データに基づく石膏製拡大模型の詳細な観察から,いくつかの幾何学特性を明らかにし,有限要素モデルを使った解析を実施した.

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  • 黒瀬川帯から解く中期古生代パンサラサ西縁の地質進化

    研究課題/領域番号:19740311  2007年 - 2008年

    日本学術振興会  科学研究費助成事業 若手研究(B)  若手研究(B)

    栗原 敏之

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    配分額:1350000円 ( 直接経費:1200000円 、 間接経費:150000円 )

    黒瀬川帯古期岩類に基づいた中期古生代パンサラサ西縁の沈み込み帯・島弧・付加体形成の解明のために,熊本県砥用地域のシルル系・デボン系から放散虫を主とした微化石の抽出とその系統分類学的研究・化石帯の設定およびそれらの対比による時代決定を行い,同帯の地史的な変遷を検討した.検出された5 つの放散虫化石群集による時代決定の結果,上部シルル系では粗粒な凝灰質砕屑岩が卓越し,下部デボン系では凝灰質砕屑物の細粒タービダイトが発達することが明らかになり,当時,珪長質な凝灰質物質を大量に供給した火山弧近傍にあった堆積盆の,後期シルル紀の半ばから相対的に深海化していった変遷過程が捉えられた.

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  • 東アジアの前期〜中期古生代珪質微化石生層序帯の構築と古生代地質体の起源

    研究課題/領域番号:03J02087  2003年 - 2005年

    日本学術振興会  科学研究費助成事業 特別研究員奨励費  特別研究員奨励費

    栗原 敏之

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    配分額:3300000円 ( 直接経費:3300000円 )

    本研究は日本列島の古生代構造帯およびこれらと地質学的に連続する東アジアの地質体を対象として,(1)オルドビス紀〜デボン紀の放散虫を主とする珪質微化石の高分解能生層序帯の構築,(2)同時代性が確立された地層間における地質現象と群集構成の比較,を行い,東アジア古生代地質体の相互関係とその起源の解明を目的とするものである.
    本年度は,日本列島の古生代構造帯に地質学的に連続するモンゴルのシルル系〜デボン系について,放散虫生層序に基づく年代決定と広域対比を目的に,基礎的な地質データの収集と化石抽出を行った.また,平成15・16年度に引き続き,国内の研究地域(南部北上帯いわき地域,熊本県の黒瀬川帯,京都府福知山地域の舞鶴帯)についても調査を継続した.
    モンゴルのシルル系〜デボン系については,20日間の野外地質調査を行った.平成16年度の野外地質調査によって,このシルル系〜デボン系が付加体であることが認定されたが,本年度はさらに広域的な調査と微化石による年代決定により,その詳細な層序と地質構造,付加年代および日本の古生界との関係も含めた古地理的な位置付けが明らかになった.その成果は国際学会(IGCP516)にて発表された.また,モンゴルから産出したシルル紀〜デボン紀の放散虫化石群集についての年代論,他地域の群集との比較などをまとめた研究結果について,2006年3月にニュージーランドで開催された国際放散虫研究集会Interrad XIにて発表を行った.

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  • 飛騨外縁帯古生界の層序およびオルドビス紀〜デボン紀放散虫の分類・化石層序

    研究課題/領域番号:01J09575  2001年 - 2002年

    日本学術振興会  科学研究費助成事業 特別研究員奨励費  特別研究員奨励費

    栗原 敏之

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    配分額:2000000円 ( 直接経費:2000000円 )

    本研究は,西南日本内帯の飛騨外縁帯を対象として,(1)オルドビス紀〜デボン紀放散虫化石層序の確立とその高精度化,(2)古生界の層序の確立,(3)形成過程の解明,(4)オルドビス紀〜デボン紀放散虫の系統分類,を目的とするものである.前年度は(1),(2)および(4)に関する基礎的なデータを収集したので,今年度はこれらを基に化石層序の高精度化と飛騨外縁帯の形成過程を考察し,その一部の内容について論文を執筆した.
    化石層序の高精度化については,前年の検討で福地-一重ヶ根地域と伊勢地域のシルル・デボン系において幾つかの放散虫群集を識別していたが,これらの群集を基に最下部シルル系H.tegimentum-S.excelsa群集帯から下部デボン系P.intermedia-P.igoi群集帯まで9つに分帯した.この成果についてIPC-2002(2002年7月シドニー)にて公表した.
    また,飛騨外縁帯の形成過程について,前年の検討で主要5地域の層序を把握したが,その構成要素が最も典型的に見られる地域として西部の伊勢地域を取り上げ考察した.これを日本地質学会学会誌に投稿した(飛騨外縁帯九頭竜湖-伊勢川上流地域における中部古生界の層序と地質年代).同論文では,放散虫化石による詳細な時代検討を行い,同時代の浅海域の炭酸塩岩と深海域の低密度流堆積物が普遍的に存在していることを明らかにした.これらは同時異相関係で,その堆積場は未成熟な海洋性島弧縁辺と推定される.同論文で扱ったのはシルル〜デボン系であるが,こうした現象は古生界全体に見られるものである.飛騨外縁帯は非常に複雑な地質構造を持った地質体であるため,これまでその形成史は明らかになっていない.しかし,本研究によって,分化した堆積盆で形成された様々な岩相の構成層が精造運動を経て接することにより現在のような複雑な地質体が形成された可能性があることが初めて示された.

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