Updated on 2023/02/08

写真a

 
TOYOSHIMA Tsuyoshi
 
Organization
Academic Assembly Institute of Science and Technology CHIKYU SEIBUTSU KAGAKU KEIRETU Professor
Graduate School of Science and Technology Environmental Science and Technology Professor
Faculty of Science Department of Science Professor
Title
Professor
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Degree

  • 理学博士 ( 1989.9   広島大学 )

  • 理学修士 ( 1983.3   新潟大学 )

Research History (researchmap)

  • Niigata University   Faculty of Science Department of Science   Professor

    2017.4

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  • Niigata University   Graduate School of Science and Technology Environmental Science and Technology   Professor

    2010.4

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  • Niigata University   Graduate School of Science and Technology Environmental Science and Technology   Professor

    2010.4

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  • Niigata University   Faculty of Science Department of Geology Historical Geology   Professor

    2010.4 - 2017.3

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  • Niigata University   Graduate School of Science and Technology Fundamental Sciences   Associate Professor

    2004.4 - 2010.3

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  • Niigata University   Faculty of Science   Associate Professor (as old post name)

    1994.9 - 1997.3

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  • Niigata University   Faculty of Science   Research Assistant

    1992.2 - 1994.8

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  • Niigata University   Graduate School of Science and Technology   Research Assistant

    1990.4 - 1992.1

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Research History

  • Niigata University   Faculty of Science Department of Science   Professor

    2017.4

  • Niigata University   Graduate School of Science and Technology Environmental Science and Technology   Professor

    2010.4

  • Niigata University   Graduate School of Science and Technology Environmental Science and Technology   Professor

    2010.4

  • Niigata University   Abolition organization Historical Geology   Professor

    2010.4 - 2017.3

  • Niigata University   Graduate School of Science and Technology Fundamental Sciences   Associate Professor

    2004.4 - 2010.3

  • Niigata University   Faculty of Science   Associate Professor (as old post name)

    1994.9 - 1997.3

  • Niigata University   Faculty of Science   Research Assistant

    1992.2 - 1994.8

  • Niigata University   Graduate School of Science and Technology   Research Assistant

    1990.4 - 1992.1

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Professional Memberships

 

Papers

  • Sinistral transpressional and extensional tectonics in Dronning Maud Land, East Antarctica, including the Sor Rondane Mountains Reviewed

    Tsuyoshi Toyoshima, Yasuhito Osanai, Sotaro Baba, Tomokazu Hokada, Nobuhiko Nakano, Tatsuro Adachi, Makoto Otsubo, Masahiro Ishikawa, Yoshifumi Nogi

    PRECAMBRIAN RESEARCH   234   30 - 46   2013.9

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    In this paper we clarify the history of deformation in the Sor Rondane Mountains (SRMs), eastern Dronning Maud Land (DML), East Antarctica, and construct a form-line contour map of the metamorphic and plutonic rocks in order to comprehend their structural features and provide constraints on the collisional tectonics of East and West Gondwana. We divide the deformational history in the SRMs into 13 stages (D1-D13). The tectonic regime varied frequently from extension (D3-D4) to layer-normal compression and layer-parallel extension (D5), to compression (D6), extension (D7), sinistral transtension and sinistral strike-slip (D8), compression (D9-D11), and finally extension related to dextral shearing (D12-D13). D7 and D8 indicate major extensional tectonic activity in the southern part of the East African and Antarctic Orogen (EAAO) before the Pan-African compressional event, and after the c. 600 Ma peak of metamorphism. The Pan-African compressional event resulted in the formation of upright folds with horizontal axes that curve along the coastline in central to eastern DML during the D9 deformation that took place between 600 and 560 Ma. The coastline-parallel fold axes and subvertical axial-planes correspond to the X-axes and the XY-planes, respectively, of strain ellipsoids that were progressively rotated counterclockwise toward the central parts of a sinistral shear zone. Therefore, the curved fold axes and axial-planes suggest the EAAO acted as a zone of sinistral transpression during the collision of parts of East and West Gondwana. Around 560-550 Ma, during D12, parallel dyke swarms of granitic pegmatite were intruded along normal faults under a regime of NNE-SSW horizontal extensional stress. The extensional paleo-stress and its related structures suggest dextral rather than sinistral shearing took place along the north-trending EAAO during this late Pan-African event. There is the possibility of a reversal of trans-orogen asymmetry from sinistral to dextral in the southern part of the EAAO. The dyke swarms are considered to have been the heralds of the voluminous 530-500 Ma A-type granite intrusions in DML. At the same time, the Lutzow-Holm Complex was under a non-extensional tectonic regime, and may have been situated in a different orogen from the EAAO. (C) 2013 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.precamres.2013.05.010

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  • Geologic evolution of the Sor Rondane Mountains, East Antarctica: Collision tectonics proposed based on metamorphic processes and magnetic anomalies Reviewed

    Yasuhito Osanai, Yoshifumi Nogi, Sotaro Baba, Nobuhiko Nakano, Tatsuro Adachi, Tomokazu Hokada, Tsuyoshi Toyoshima, Masaaki Owada, Madhusoodhan Satish-Kumar, Atsushi Kamei, Ippei Kitano

    PRECAMBRIAN RESEARCH   234   8 - 29   2013.9

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    The Sor Rondane Mountains of eastern Dronning Maud Land, East Antarctica can be subdivided into two different crustal terranes: the NE-terrane and the SW-terrane. The former is underlain by basement rocks of amphibolite-facies (unit A) and granulite-facies (unit B), and the latter by granulite-facies (unit C) to greenschist-facies (units D and D') rocks. The metamorphic evolution of the NE-terrane exhibits a clockwise pressure-temperature-time (P-T-t) path and the SW-terrane exhibits a counter-clockwise P-T-t path, and detrital zircon U-Pb ages are also different between the two terranes. The differences in the metamorphic evolution processes and detrital zircon provenance in these two regions can be explained by the collision of the NE-terrane and the SW-terrane which is constrained to have occurred at 600-650 Ma. The collision is interpreted to reflect convergence between the East Maud-East African orogen terrane and the Maud-Nampula terrane of the Kalahari Craton, which are bounded by the Main Tectonic Boundary and passes through the Sor Rondane Mountains. The RTP magnetic anomalies suggest this suture is cut by the subsequent collision boundary between the Kalahari Craton and the Rayner Belt, which is exposed in the Lutzow-Holm region. This collisional belt is considered to have formed at approximately 520-580 Ma. (C) 2013 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.precamres.2013.05.017

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  • Crystal bending, subgrain boundary development, and recrystallization in orthopyroxene during granulite-facies deformation Reviewed

    Hugues Raimbourg, Toshihiro Kogure, Tsuyoshi Toyoshima

    CONTRIBUTIONS TO MINERALOGY AND PETROLOGY   162 ( 5 )   1093 - 1111   2011.11

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:SPRINGER  

    A prominent feature of a granulite-facies shear zone from the Hidaka Main Zone (Japan) is the folding of orthopyroxene (opx) porphyroclasts. Dislocation density estimated by transmission electron microscope (TEM) and chemical etching in homogeneously folded domains is too low to account for the amplitude of crystallographic bending, leading us to propose a model similar to "flexural slip" folding, where folded layers are micrometer-wide opx layers between thin planar clinopyroxene (cpx) exsolutions. Extension (compression) in the extrados (intrados) of the folded layer is accommodated by dislocations at the cpx-opx interfaces. Alternatively to distributed deformation, crystal bending also localizes in grain boundaries (GBs), mostly oriented close to the (001) plane and with various misorientation angles but misorientation axes consistently close to the b-axis. For misorientation up to a few degrees, GBs were imaged as tilt walls composed of regularly spaced (100)[001] dislocations. For misorientation angles of 7A degrees, individual dislocations are no longer visible, but high-resolution TEM (HRTEM) observation showed the partial continuity of opx tetrahedral chains through the boundary. For 21A degrees misorientation, the two adjacent crystals are completely separated by an incoherent boundary. In spite of these atomic-scale variations, all GBs share orientation and rotation axis, suggesting a continuous process of misorientation by symmetric incorporation of (100)[001] dislocations. In addition to the dominant GBs perpendicular to the (100) plane, boundaries at low angle with (100) planes are also present, incorporating dislocations with a component of Burgers vector along the a-axis. The two kinds of boundaries combine to delimit subgrains, which progressively rotate with respect to host grains around the b-axis, eventually leading to recrystallization of large porphyroclasts.

    DOI: 10.1007/s00410-011-0642-3

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  • Inferred ultrahigh-temperature metamorphism of amphibolitized olivine granulite from the Sor Rondane Mountains, East Antarctica Reviewed

    Nobuhiko Nakano, Yasuhito Osanai, Sotaro Baba, Tatsuro Adachi, Tomokazu Hokada, Tsuyoshi Toyoshima

    POLAR SCIENCE   5 ( 3 )   345 - 359   2011.9

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    This paper reports the first evidence of ultrahigh-temperature (UHT) metamorphism from the Sor Rondane Mountains, eastern Dronning Maud Land, East Antarctica, which is evident as orthopyroxene + spinel symplectite in an amphibolitized mafic granulite. The granulite consists of olivine, orthopyroxene, clinopyroxene, pargasitic amphibole, plagioclase, and ilmenite, and it possesses a within-plate alkali basalt signature. The local bulk chemical composition of symplectite, major and trace element compositions, and thermodynamic calculations for the symplectite, suggest the presence of garnet at the high-pressure stage and that the symplectite formed from garnet, olivine, and primary orthopyroxene by decompression from more than 12 kbar at 1000 degrees C. The granulite records a subsequent amphibolite-facies overprint (<700 degrees C at <6 kbar) that involved the chemical re-equilibration of several phases. The obtained pressure-temperature (P-T) conditions and P-T path are different from the UHT metamorphism from the Schirmacher Hills, central Dronning Maud Land, which is considered to have occurred in a back-arc tectonic setting. The relatively high-P conditions and the decompression path reconstructed in the present study are similar to those reported for southern India, Sri Lanka, and part of northeastern Mozambique, possibly reflecting continental thickening and exhumation during the main collision event between East and West Gondwana. (C) 2011 Elsevier B. V. and NIPR. All rights reserved.

    DOI: 10.1016/j.polar.2011.03.005

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  • Titanium behavior in quartz during retrograde hydration: Occurrence of rutile exsolution and implications for metamorphic processes in the Sor Rondane Mountains, East Antarctica Reviewed

    Tatsuro Adachi, Tomokazu Hokada, Yasuhito Osanai, Tsuyoshi Toyoshima, Sotaro Baba, Nobuhiko Nakano

    POLAR SCIENCE   3 ( 4 )   222 - 234   2010.1

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    In the central Sor Rondane Mountains, East Antarctica, orthopyroxene felsic gneiss (OPG) was converted to hornblende-biotite felsic gneiss (HBG) by hydration that accompanied the intrusion of pegmatite. The retrograde HBG contains exsolved rutile in quartz. The composition of orthopyroxene and clinopyroxene in OPG suggests a temperature of 840 degrees C (interpreted as the near-peak temperature), and the composition of hornblende and plagioclase in HBG suggests a temperature of 670-700 degrees C (interpreted as the temperature during hydration). Ti concentrations in quartz were measured using an electron probe micro-analyzer, and Ti-in-quartz thermometers were applied. Measured Ti concentrations were 110 ppm (equivalent to 760-820 degrees C) for homogeneous quartz from OPG and 35 ppm (650-700 degrees C) for an exsolution-free area of a quartz grain from HBG. The pre-exsolution Ti concentration in quartz from HBG was reconstructed with 100 mm beam diameter and 25 kV of accelerating voltage, giving 103 ppm, similar to the value obtained for homogeneous quartz in OPG. The temperatures obtained using a Ti-in-quartz thermometer are consistent with those estimated using other thermometers. Although analysis of the main constitute minerals in HBG yields the conditions of hydration, the reconstructed pre-exsolution Ti content in quartz within HBG yields the pre-hydration conditions. Thus, the Ti-in-quartz thermometer is a potentially powerful tool with which to identify the peak or near-peak temperature conditions, even for retrogressed metamorphic rocks. (C) 2009 Elsevier B.V. and NIPR All rights reserved.

    DOI: 10.1016/j.polar.2009.08.005

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  • Grain-size reduction mechanisms and rheological consequences in high-temperature gabbro mylonites of Hidaka, Japan Reviewed

    Hugues Raimbourg, Tsuyoshi Toyoshima, Yuta Harima, Gaku Kimura

    EARTH AND PLANETARY SCIENCE LETTERS   267 ( 3-4 )   637 - 653   2008.3

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    The study of microstructures and crystallographic fabrics in a granulite-facies shear zone of the Hidaka Metamorphic Belt showed that the strong shearing localized within the mylonite resulted in the asymmetrical elongation of the inherited orthopyroxene porphyroclasts and the generation of fine-grained plagioclase and orthopyroxene layers as asymmetric tails of orthopyroxene porphyroclasts. The orthopyroxene porphyroclasts and the coarse plagioclase matrix surrounding them have a strong crystallographic preferred orientation acquired through deformation by dislocation creep. In contrast, the small orthopyroxene and plagioclase grains located in the tails have equant shapes and random fabric that are interpreted as the result of deformation by grain-boundary sliding. The small orthopyroxene grains are generated on the sheared rims of the orthopyroxene porphyroclasts by subgrain rotation, inheriting the orientation of the porphyroclasts before deforming by grain-boundary sliding (GBS) and losing this fabric. Additional mechanism of grain-size reduction is the disruption of orthopyroxene porphyroclasts by synthetic shear zones localized on clinopyroxene exsolutions. The switch in deformation mechanism from dislocation creep to GBS, associated with the grain-size reduction, yielded estimates of deviatoric stress one order smaller than lithostatic pressure. Besides, such theological evolution attests of the mechanical softening during deformation, which contributed to the localization of the strain within the mylonite. (C) 2007 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.epsl.2007.12.012

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  • Carbonic fluids in ultrahigh-temperature metamorphism: Evidence from Raman spectroscopic study of fluid inclusions in granulites from the Napier complex, East Antarctica Reviewed

    T. Tsunogae, M. Santosh, J. Dubessy, Y. Osanai, M. Owada, T. Hokada, T. Toyoshima

    Geological Society Special Publication   308   317 - 332   2008

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    We report the first quantitative compositional data on fluid inclusions in ultrahigh-temperature (UHT) granulites from the Napier Complex of Enderby Land, East Antarctica. Fluid inclusions in various high-grade minerals such as garnet, orthopyroxene and sapphirine from three UHT localities in the Amundsen Bay area were studied in terms of petrography and microthermometry as well as laser Raman spectroscopy. Measured melting temperatures of inclusions from all the three localities indicate that the trapped fluid phase is dominantly carbonic. Raman analyses confirmed a near pure CO2 composition with only minor dilutants such as N2 (&lt
    6.0 mol%), CH4 (&lt
    0.3 mol%), and H2O(&lt
    0.1 mol%). CH4-bearing fluid associated with sapphirine granulites suggests low oxygen fugacity (f O2) conditions for the rocks, whereas CH4 was not detected from fluid inclusions in magnetite-bearing high-f O2 garnet granulite. The range of CO2 isochores computed from density measurements in fluid inclusions from the granulites pass through the peak P-T conditions of the Napier metamorphism (T = 1050-1150 °C, P = 9-11kbar) indicating synmetamorphic nature of the fluids. Inclusions in garnet from Bunt Island coexist with carbonate minerals (magnesite) and graphite along with dense CO2-rich fluid, indicating probable derivation from deep-seated primary magmatic sources. The ubiquitous association of carbonic fluids in the UHT mineral assemblages suggests CO2 influx during extreme crustal metamorphism of the Napier Complex. The carbonic fluid probably played an important role in transporting heat from mantle or mantle-derived magmas and in stabilizing the dry mineral assemblages. © The Geological Society of London 2008.

    DOI: 10.1144/SP308.15

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  • Macroscopic geological structures of the Napier and Rayner Complexes, East Antarctica Reviewed

    T. Toyoshima, Y. Osanai, Y. Nogi

    Geological Society Special Publication   308   139 - 146   2008

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    This paper presents a form-line map of the Napier and Rayner Complexes, East Antarctica, constructed from attitude data for foliations shown on published geological maps, and discusses the macroscopic geological structures. The form-line map shows that the two complexes consist of several, structurally distinct, units or blocks bounded by east-west-,NE-SW- and NW-SE-striking faults. The major boundary between the two complexes, as indicated on the published geological maps, is a structural discontinuity shown as a large fault on the form-line map. On the form-line map, east-west- and NE-SW-trending folds are abundant and NW-SE-trending ones occur locally in both complexes. North-south-trending folds are also abundant in the Napier Complex. Dome-and-basin fold patterns on a regional scale occur in some regions. The regional strikes, macroscopic structures, and the major boundary between the two complexes are considered to have resulted from the same later deformation episode. The form-line map and distribution map of key mineral assemblages show that the Napier Complex is not uniform and includes at least two types of metamorphic units or fragments of the Archaean crust that were formed through distinct P-T-t evolutionary processes and divided by several faults. © The Geological Society of London 2008.

    DOI: 10.1144/SP308.6

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  • Groundwater changes associated with the 2004 Niigata-Chuetsu and 2007 Chuetsu-oki earthquakes Reviewed

    Satoshi Itaba, Naoji Koizumi, Tsuyoshi Toyoshima, Masashi Kaneko, Kazuyoshi Sekiya, Kunio Ozawa

    EARTH PLANETS AND SPACE   60 ( 12 )   1161 - 1168   2008

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:TERRA SCIENTIFIC PUBL CO  

    The Geological Survey of Japan, AIST, has been monitoring groundwater in and around the Kinki and Tokai districts for earthquake prediction research. The Niigata Prefectural Office has also been observing groundwater for monitoring land subsidence in Niigata Prefecture. The 2004 Niigata-Chuetsu (M(JMA) 6.8) and 2007 Chuetsuoki (M(JMA) 6.8) earthquakes occurred in Niigata Prefecture, Japan, on October 23, 2004 and July 16, 2007, respectively. The two earthquakes have a similar magnitude, epicenter, and mechanism. At many of the observation wells, we detected changes in groundwater level or pressure related to the two earthquakes, but no clear precursory changes. At all of our observation wells in Niigata Prefecture, trend changes were observed after coseismic step-like changes for both of the earthquakes. At some of the Stations in and around the Kinki and Tokai districts, coseismic trend changes and/or step-like changes were observed. The pattern of the changes were almost similar for the two earthquakes. Those changes were considered to be caused not by the static crustal deformation but by the ground shaking.

    DOI: 10.1186/BF03352873

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  • Crustal anatexis and formation of two types of granitic magmas in the Kontum massif, central Vietnam: Implications for magma processes in collision zones Reviewed

    M. Owada, Y. Osanai, N. Nakano, T. Matsushita, Tran Ngoc Nam, T. Tsunogae, T. Toyoshima, Pham Binh, H. Kagami

    GONDWANA RESEARCH   12 ( 4 )   428 - 437   2007.11

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    Asia grew in the Late Permian by the collision of a number of micro-continents. Syn- to post-collisional magmatism occurred along the continental collision zones. In this study, we report two types of granitic rocks, garnet granite (Grt granite) and orthopyroxene granite (Opx granite), from the Kontum massif, central Vietnam, which is situated on the continental collision zone between the South China and Indochina cratons. These granitic rocks were formed at ca. 250 Ma when high-temperature (HT) and ultrahigh-temperature (UHT) metamorphism took place in the same zone. Based on the petrological and geochemical features compared with previously reported experimental results, garnet-bearing granite is derived from pelitic gneisses by partial melting, whereas orthopyroxene-bearing granite is produced by the partial melting of garnet-bearing mafic granulites. We inferred that a significantly high-geothermal gradient is required to produce Vietnamese granitic magmatism and related HT to UHT metamorphism. This geotherm may be attributed to upwelling mantle plume beneath the Kontum massif during the Late Permian. (c) 2006 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.gr.2006.11.001

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  • Geologic and metamorphic evolution of the basement complexes in the Kontum Massif, central Vietnam Reviewed

    N. Nakano, Y. Osanai, M. Owada, Tran Ngoc Nam, T. Toyoshima, P. Binh, T. Tsunogae, H. Kagami

    GONDWANA RESEARCH   12 ( 4 )   438 - 453   2007.11

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    This paper presents a regional scale observation of metamorphic geology and mineral assemblage variations of Kontum Massif, central Vietnam, supplemented by pressure-temperature estimates and reconnaissance geochronological results. The mineral assemblage variations and thermobarometric results classify the massif into a low- to medium-temperature and relatively high-pressure northern part characterised by kyanite-bearing rocks (570-700 degrees C at 0.79-0.86 GPa) and a more complex southern part. The southern part can be subdivided into western and eastern regions. The western region shows very high-temperature (> 900 degrees C) and -pressure conditions characterised by the presence of garnet and orthopyroxene in both mafic and pelitic granulites (900-980 degrees C at 1.0-1.5 GPa). The eastern region contains widespread medium- to high-temperature and low-pressure rocks, with metamorphic grade increasing from north to south; epidote- or muscovite-bearing gneisses in the north (< 700-740 degrees C at < 0.50 GPa) to garnet-free mafic and orthopyroxene-free pelitic granulites in the south (790-920 degrees C at 0.63-0.84 GPa). The Permo-Triassic Sm-Nd ages (247-240 Ma) from high-temperature and -pressure granulites and recent geochronological studies suggest that the south-eastern part of Kontum Massif is composed of a Siluro-Ordovician continental fragment probably showing a low-pressure/temperature continental geothermal gradient derived from the Gondwana era with subsequent Permo-Triassic collision-related high-pressure reactivation zones. (c) 2007 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.gr.2007.01.003

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  • 日高衝突帯下部地殻の岩石構成と変形運動(共著) Reviewed

    小山内康人, 大和田雅昭, 豊島剛志

    地質学雑誌   113   29 - 50   2007.1

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  • Pan-African adakitic rocks from the Sr Rondane Mountains, East Antarctica Reviewed

    Owada, M, Toyoshima, T, Shiraishi, K, Kagami, H

    Polar Geoscience   19   173 - 188   2006.12

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  • 日高変成帯にみられる地殻深部現象

    小山内康人, 豊島剛志, 大和田正明, 志村俊昭

    地質学雑誌   112   XXI - XXII   2006.11

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  • 日高変成帯,最下部トーナル岩マグマの冷却プロセス Reviewed

    志村俊昭, 小山内康人, 豊島剛志, 大和田正明, 小松正幸

    地質学雑誌   112   654 - 665   2006.11

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    DOI: 10.5575/geosoc.112.654

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  • Provenance of Paleozoic-Mesozoic sedimentary rocks in the Inner Zone of Southwest Japan: An evaluation based on Nd model ages Reviewed

    H. Kagami, Y. Kawano, M. Akiyama, T. Ikawa, T. Imaoka, J. Ishioka, T. Toyoshima, T. Hamamoto, Y. Hayasaka, Y. Ikeda, M. Yuhara, Y. Tainosho

    GONDWANA RESEARCH   9 ( 1-2 )   142 - 151   2006.1

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    Nd model ages using depleted mantle (TDM) values for the sedimentary rocks in the Inner Zone of the SW Japan and western area of Tanakura Tectonic Line in the NE Japan allow classification into five categories: 2.6-2.45, 2.3-2.05, 1.9-1.55, 1.45-1.25, and 1.2-0.85 Ga. The provenance of each terrane/belt/district is interpreted on the basis of the TDMs, Sm-147/Nd-144 vs. Nd-143/Nd-144 relation, Nd isotopic evolution of the source rocks in East China and U-Pb zircon ages. The provenance of 2.6-1.8 Ga rocks, which are reported from Hida-Oki and Renge belts and Kamiaso conglomerates, is inferred to be the Sino-Korean Craton (SKC). The 2.3-1.55 Ga rocks, mostly from Ryoke, Mino and Ashio belts, are originally related with the SKC and/or Yangtze Craton (YC). The provenances of the sedimentary rocks with 1.45-0.85 Ga, from the Suo belt, Higo and some districts in the Mino and Ashio belts, are different from the SKC and YC. Especially, the Higo with 1.2-0.85 Ga is considered as a fragment of collision zone in East China. Akiyosbi belt probably belongs to the youngest age category of 1.2-0.85 Ga.
    Some metasedimentary rocks from the Ryoke belt have extremely high Sm-147/Nd-144 and Nd-143/Nd-144 ratios, whose main components are probably derived from mafic igneous rocks within the Ryoke belt itself and from the adjacent Tamba belt. (c) 2005 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.gr.2005.11.001

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  • 2004年新潟県中越地震震源域周辺における地下水温・水質異常と地下地質構造の関係について

    産業技術総合研究所

    第165回地震予知連絡会資料   2006.1

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  • The Higo metarnorphic complex in Kyushu, Japan as the fragment of Permo-Triassic metamorphic complexes in East Asia Reviewed

    Y Osanai, M Owada, A Kamei, T Hamamoto, H Kagami, T Toyoshima, N Nakano, TN Nam

    GONDWANA RESEARCH   9 ( 1-2 )   152 - 166   2006.1

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    The Higo terrane in west-central Kyushu Island, southwest Japan consists from north to south of the Manotani, Higo and Ryuhozan metamorphic complexes, which are intruded by the Higo plutonic complex (Miyanohara tonalite and Shiraishino granodiorite). The Higo and Manotani metamorphic complexes indicate an imbricate crustal section in which a sequence of metamorphic rocks with increasing metamorphic grade from high (northern part) to low (southern part) structural levels is exposed. The metamorphic rocks in these complexes can be divided into five metamorphic zones (zone A to zone E) from top to base (i.e., from north to south) on the basis of mineral parageneses of pelitic rocks. Greenschist-facies mineral assemblages in zone A (the Manotani metamorphic complex) give way to amphibolite-facies assemblages in zones B, C and D, which in turn are replaced by granulite-facies assemblages in zone E of the Higo metamorphic complex. The highest-grade part of the complex (zone E) indicates peak P-T conditions of ca. 720 MPa and ca. 870 degrees C. In addition highly aluminous Spr-bearing granulites and related high-temperature metamorphic rocks occur as blocks in peridotite intrusions and show UBT-metamorphic conditions of ca. 900 MPa and ca. 950 degrees C. The prograde and retrograde P-T evolution paths of the Higo and Manotani metamorphic complexes are estimated using reaction textures, mineral inclusion analyses and mineral chemistries, especially in zones A and D, which show a clockwise P-T path from Lws-including Pmp-Act field to Act-Chl-Epi field in zone A and St-Ky field to And field through Sil field in zone D. The Higo metamorphic complex has been traditionally considered to be the western-end of the Ryoke metamorphic belt in the Japanese Islands or part of the Kurosegawa-Paleo Ryoke terrane in south-west Japan. However, recent detailed studies including Permo-Triassic age (ca. 250 Ma) determinations from this complex indicate a close relationship with the high-grade metamorphic terranes in eastern-most Asia (e.g., north Dabie terrane) with similar metamorphic and igneous characteristics, protolith assembly, and metamorphic and igneous ages. The north Dabie high-grade terrane as a collisional metamorphic zone between the North China and the South China cratons could be extended to the N-NE along the transcurrent fault (Tan-Lu Fault) as the Sulu belt in Shandong Peninsula and the lmjingang belt in Korean Peninsula. The Higo and Manotani metamorphic complexes as well as the Hida-Oki terrane in Japan would also have belonged to this type of collisional terrane and then experienced a top-to-the-south displacement with forming a regional nappe structure before the intrusion of younger Shiraishino granodiorite (ca. 120 Ma). 0 2005 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.gr.2005.06.008

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  • 2004年新潟県中越地震・地震断層出現域の浅層反射法地震探査:データ取得と処理について Reviewed

    佐藤比呂志, 加藤直子, 越後智雄, 萩野スミ子, 立石雅昭, 戸田 茂, 加藤 一, 越谷 信, 豊島剛志, 伊藤谷生, 今泉俊文, 阿部信太郎, 鈴木規眞, 三沢永一, 小田 晋, 楮原京子, 小池太郎, 赤井 智, 野田克也

    地震研究所彙報   80   1 - 9   2005.12

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  • 2004 年新潟県中越地震に伴う地下水温・水質の異常

    佐藤早苗, 氏原英敏, 豊島剛志, 小林健太, 渡部直喜, 大川直樹, 和田幸永, 小河原孝彦, 播磨雄太, 小泉尚嗣

    新潟大災害研年報   No. 27   41 - 56   2005.12

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  • 液状化対策と地下水面変動からみた中越地震

    中野俊郎, 稲葉一成, 豊島剛志, 卯田 強

    新潟県連続災害の検証と復興への視点 新潟大学・中越地震新潟大学調査団   116 - 125   2005.8

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  • 新潟県中越地震の地質学的背景

    宮下純夫, 豊島剛志, 小林健太

    新潟県連続災害の検証と復興への視点 新潟大学・中越地震新潟大学調査団   17 - 20   2005.8

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  • 新潟県中越地震における地震断層と地表変状の構造地質学的調査

    豊島剛志, 小林健太, 岩下享平, 大塚洋之, 佐藤早苗, 氏原英敏, 大川直樹, 大橋聖和, 和田幸永, 小安孝幸, 小河原孝彦, 山本 亮, 渡部直喜, 立石雅昭, 島津光夫

    新潟県連続災害の検証と復興への視点 新潟大学・中越地震新潟大学調査団   21 - 31   2005.8

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  • 2004 年新潟県中越地震の強振動方向小千谷市街地における解析

    小林健太, 豊島剛志, 大川直樹, 播磨雄太, 大橋聖和, 大友隆史, 小久保晋一, 萩原知之, 洞口圭史, 山本 亮

    新潟県連続災害の検証と復興への視点 新潟大学・中越地震新潟大学調査団   46 - 49   2005.8

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  • 2004 年新潟県中越地震に伴う小千谷市街周辺の地盤変状

    岩下享平, 小林健太, 豊島剛志, 構造地質学研究チーム

    新潟県連続災害の検証と復興への視点 新潟大学・中越地震新潟大学調査団   42 - 45   2005.8

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  • 2004 年新潟県中越地震による地下水異常

    佐藤早苗, 氏原英敏, 豊島剛志, 小林健太, 渡部直喜, 大川直樹, 和田幸永, 小河原孝彦, 播磨雄太

    新潟県連続災害の検証と復興への視点 新潟大学・中越地震新潟大学調査団   50 - 56   2005.8

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  • 中越地震災害への組織的取り組み-新潟大学調査団の場合

    豊島剛志

    日本大学広報部発行「桜門春秋」   2005春季号No.103   18 - 24   2005.4

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  • 陸域地震震源域の地質学的準備過程-日高変成帯南部を例として

    島田耕史, 田中秀実, 豊島剛志, 小原友弘, 新里忠史

    月刊地球号外   no. 50   38 - 44   2005.4

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  • 日高変成帯におけるシュードタキライトの分布と地殻構造,アスペリィティ,化石震源域

    豊島剛志, 小原友弘, 新里忠史, 田中秀実, 島田耕史, 小松正幸, 和田幸永, 小安孝幸, 一ノ瀬ゆき

    月刊地球号外   no. 50   31 - 37   2005.4

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  • 地震と断層(2004年新潟県中越地震を例として)

    豊島剛志

    証券奨学同友会会報   第26号   29 - 32   2005.3

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  • Geologic fault model based on the high-resolution seismic reflection profile and aftershock distribution associated with the 2004 Mid-Niigata Prefecture earthquake (M6.8), central Japan Reviewed

    N Kato, T Echigo, H Sato, M Tateishi, S Ogino, S Sakai, S Toda, S Koshiya, T Ito, T Toyoshima, T Imaizumi, H Kato, S Abe

    EARTH PLANETS AND SPACE   57 ( 5 )   447 - 452   2005

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    The Mid-Niigata Prefecture earthquake in 2004 (M-JMA 6.8) generated surface ruptures along the eastern rim of the Uonuma Hills. To elucidate the structural linkage between the surface ruptures and the source fault at depth, the high-resolution seismic reflection profile across the surface ruptures and nearby active faults, and the data of aftershock distribution are examined. The 5.2-km-long, high-resolution, depth-converted seismic section reveals an emergent thrust beneath the surface ruptures. A two-dimensional model of the fault geometry has been constructed based on the aftershock distribution and the shallow reflection profile. The development of the main geologic structure are well explained by forward modeling using a balanced cross-section method. In detail, the fault system generated the main shock dips at a steep angle (60 degrees) below 5 km depth and more shallowly (30 degrees) near the surface.

    DOI: 10.1186/BF03351832

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  • Petrogenesis of the Late Permian Plei Man Ko granite in the Kontum Massif, central Vietnam Reviewed

    Owada, M, Osanai, Y, Nakano, N, Nam, T. N, Binh, P, Matsushita, T, Tsunogae, T, Toyoshima, T, Kagami, H

    Gondwana Research   7   1363 - 1365   2004.12

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  • Metamorphic evolution of high-pressure and ultrahigh-temperature granulites from the Kontum Massif, central Vietnam Reviewed

    Osanai, Y, Nakano, N, Owada , M, Nam, T. N, Toyoshima, T, Tsunogae, T, Binh, P, Kagami, H

    Gondwana Research   7   1360 - 1363   2004.12

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  • Finding of UHP metamorphic rocks from the Kontum Massif, central Vietnam Reviewed

    Nakano, N, Osanai, Y, Owada , M, Nam, T. N, Tsunogae, T, Toyoshima, T, Binh, P

    Gondwana Research   7   1350 - 1352   2004.12

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  • Pseudotachylytes and an ancient seismogenic area in the Hidaka metamorphic belt, Hokkaido, northern Japan

    Toyoshima, T, Komatsu, M, Tanaka, H, Shimada, K, Obara, T, Niizato, T, Wada, Y

    PROCEEDINGS, 1st International Workshop on WATER DYNAMICS   1   117 - 122   2004.12

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  • Occurrence of mylonite zones and pseudotachylyte veins around the base of the upper crust: An example from the southern Hidaka metamorphic belt, Samani area, Hokkaido, Japan Reviewed

    Shimada, K, Tanaka, H, Toyoshima, T, Obara, T, Niizato, T

    Earth Planets Space   56   1219 - 1225   2004.12

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    DOI: 10.1186/BF03353343

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  • Heterogeneous material distribution, an important reason for generation of strain-localized mylonite and frictional slip zones in the Hidaka metamorphic belt, Hokkaido, Japan Reviewed

    Tanaka, H, Shimada, K, Toyoshima, T, Obara, T, Niizato, T

    Earth Planets Space   56   1227 - 1234   2004.12

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    DOI: 10.1186/BF03353344

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  • Nd-isotopic composition of Phanerozoic sediments in the Inner Zone of Southwest Japan Arc: Implications on provenance characteristics and contribution to formation of mature island arc system Reviewed

    Hiroo Kagami, Yoshinobu Kawano, Toshiyuki Ikawa, Naoko Nishi, Tsuyoshi Toyoshima, Takuji Hamamoto, Yasutaka Hayasaka, Yasuo Ikeda, Masaki Yuhara, Yoshiaki Tainosho

    Proceedings of the Japan Academy Series B: Physical and Biological Sciences   80 ( 1 )   1 - 9   2004.1

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    The Nd-isotopic data on sedimentary and metamorphic rocks of SW Japan Arc allow their discrimination into five different depleted mantle (TDM) model age clusters, 2.6-2.45 Ga, 2.3-2.05 Ga, 1.9-1.55 Ga, 1.45-1.25 Ga, 1.2-0.85 Ga. The 2.6-2.45 Ga and 1.9-1.55 Ga model ages are also coincident with U-Pb inherited zircon ages of the above two epochs as well as the major magmatic activity in the Sino-Korean Craton (SKC). The 2.3-2.05 Ga model ages can be considered as the initial formation ages for the precursors of sedimentary rocks. The Nd-isotopic data suggest that the Hida Belt was most likely formed as a part of the SKC. The mantle underlying the Ryoke Belt had continental lithospheric signature during Triassic-Jurassic period. The 1.9-1.55 Ga model ages, especially 1.8 Ga∼, can be associated with the formation of this belt. The source material for the sedimentary rocks occurring in the accretionary terrane of northeastern areas in the SW Japan Arc was probably in and around the SKC of the Ryoke Belt itself. The sedimentary rocks occurring in southwestern areas of the Arc were mainly composed of materials derived from a relatively younger source (1.45-0.85 Ga).

    DOI: 10.2183/pjab.80.1

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  • Decompression process of mafic granulite from eclogite to granulite facies under ultrahigh-temperature condition in the Kontum Massif, Central Vietnam Reviewed

    Nobuhiko Nakano, Yasuhito Osanai, Masaaki Owada, Tran Ngoc Nam, Toshiaki Tsunogae, Tsuyoshi Toyoshima, Pham Binh

    Journal of Mineralogical and Petrological Sciences   99 ( 4 )   242 - 256   2004

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    Garnet-bearing mafic granulites from the Ngoc Linh Complex of the Kontum massif in central Vietnam occur as lenses or blocks within felsic gneisses. Some of these granulite blocks show some evidences for ultrahigh-temperature and high-pressure metamorphism. Samples studied here consist mainly of garnet (Alm34-48, Prp27-34, Grs18-24, Sps0-3), clinopyroxene (Mg# = 0.73-0.87) and quartz, which are relatively large grains. The garnet and clinopyroxene are surrounded by symplectites composed of orthopyroxene, plagioclase, magnetite and sometimes spinel. Therefore, the presumed equilibrium peak-pressure assemblage could be of garnet, clinopyroxene and quartz, which was stable at eclogite-facies conditions. Dual-stage generated symplectites involving orthopyroxene and plagioclase were identified among garnet, clinopyroxene and quartz. The first-generated symplectite is composed of Al- and Mg-poor orthopyroxene (Mg# = 0.61-0.68, Al 2O 3 = 1.5-2.6 wt%) and Na-rich plagioclase (An45-53). The second symplectite is composed of Al- and Mg-rich orthopyroxene (Mg# = 0.69-0.72, Al 2O 3 = 4.1-5.3 wt%), Na-poor plagioclase (An86-93), spinel (Mg# = 0.42-0.48) and magnetite. The compositional differences between the two symplectites can be interpreted to be due to the difference in metamorphic reaction stages. The first symplectite had been formed by the reaction between garnet, clinopyroxene and quartz, which occurred during the decompression process just after peak-pressure conditions. The second symplectite could be produced during the late breakdown of garnet. Temperature and pressure conditions around peak-pressure conditions are estimated from the garnet-clinopyroxene thermometries and from the reaction of jadeite + quartz = albite, respectively. The results indicated peak-pressure conditions as ca. 950°C and 1.6 GPa. The pressure-temperature conditions for the formations of first- and second-symplectites were 1000°C at 1.3 GPa and 850°C at 0.8 GPa, respectively. Whole mineral assemblages of the mafic granulites show that the metamorphic evolution took place under completely dry conditions. The textual observations as well as the pressure-temperature estimations indicate a near isothermal decompression process for this granulite. This evolution path is consistent with that of ultrahigh-temperature pelitic granulites from the Kannak Complex. Thus, the possibility of simultaneous ultrahigh-temperature metamorphic event in the Kontum massif can be argued.

    DOI: 10.2465/jmps.99.242

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  • Pseudotachylytes, related fault rocks, asperities, and crustal structures in the Hidaka metamorphic belt, Hokkaido, northern Japan Reviewed

    T Toyoshima, T Obara, T Niizato, H Tanaka, K Shimada, M Komatsu, Y Wada, T Koyasu

    EARTH PLANETS AND SPACE   56 ( 12 )   1209 - 1215   2004

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    Many pseudotachylytes and their related fault rocks are found in the Hidaka metamorphic belt representing an ancient crustal section. On the basis of field observations of the pseudotachylytes and related fault rocks, nature of seismogenic faulting in the Hidaka crust is examined. The field observations suggest the following conclusions. (1) Two structural types of pseudotachylytes are distinguished: layer-parallel and layer-oblique. The latter are scattered in the metamorphic belt, but the former occur only in the southern part of the metarnorphic belt. (2) An abundance of the layer-parallel pseudotachylytes suggests that earthquakes occurred repeatedly and frequently in the southern part, where complicated and duplicated crustal structures occur with many low-temperature thin mylonite zones. The southern part with such crustal structures was an ancient seismogenic area containing asperities and having a radius of a few tens of kilometers in the Hidaka crust. In the seismogenic area, the layer-parallel pseudotachylytes resulted from seismic slip on the mylonitic foliation within the low-temperature mylonite zones with strong preferred orientation of micas. (3) The layer-parallel pseudotachylytes and the subsequent layer-oblique pseudotachylytes post-date the latest and very-low-temperature mylonitization in the metarnorphic belt. The former pseudotachylytes formed just above the upper side of the brittle-plastic transition zone.

    DOI: 10.1186/BF03353342

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  • Permo-triassic ultrahigh-temperature metamorphism in the Kontum Massif, Central Vietnam Reviewed

    Yasuhito Osanai, Nobuhiko Nakano, Masaaki Owada, Tran Ngoc Nam, Tsuyoshi Toyoshima, Toshiaki Tsunogae, Pham Binh

    Journal of Mineralogical and Petrological Sciences   99 ( 4 )   225 - 241   2004

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    The Kontum massif in central Vietnam consists of low-grade schists and amphibolite- to granulite-facies metamorphic rocks, that have been intruded by S-type and I-type granites. This terrane was formerly considered to be composed mainly of Archean granulites (the Kannak Complex), Proterozoic amphibolite-facies metamorphic rocks (the Ngoc Linh Complex) and low-grade schists (the Kham Duc Complex). They were thought to be the basement of the Indochina Craton in south-east Asia. The Kannak Complex is dominated by pelitic-semipelitic gneisses metamorphosed under high- to ultrahigh-temperature (UHT) conditions into granulite-facies. A minor amount of mafic and calc-silicate rocks are also intercalated within the gneisses. The major types of ultrahigh-temperature pelitic metamorphic rocks in this complex are garnet-orthopyroxene-sillimanite-cordierite gneiss, orthopyroxene-bearing garnet-cordierite-silliamnite-biotite gneiss and garnet-orthopyroxene charnockitic gneiss. The highest-grade metamorphic condition is determined from garnet-orthopyroxene-sillimanite-cordierite gneiss, which indicates that multi-stage symplectite formation during retrograde stage started from isothermal decompression in UHT condition (1000°C&lt
    ). Because of the high amount of pyrope (up to 59 mole%) in garnet and high-Al 2O 3 in orthopyroxene (up to 10 wt%), these minerals were unstable in the P-T conditions during the retrograde stage. On the other hand, the newly found garnet-clinopyroxene-orthopyroxene granulites (eclogitic ultrahigh-temperature mafic granulite) from the Ngoc Linh Complex shows a series of changes in divariant assemblages from garnet-clinopyroxene-quartz to hornblende-quartz through clinopyroxene-orthopyroxene-plagioclase-(garnet). It was identified that these rocks were formed as a result of their metamorphic evolution of isothermal decompression followed by nearly isobaric cooling. The ultrahigh-temperature metamorphic rocks in the Kontum massif, which are exposed along the Dac To Kan shear zone, show a clockwise pressure-temperature path with the peak metamorphic condition of ca. 12 kbar and ca. 1050°C (M1 metamorphism). High-pressure M0 metamorphism (ca. 17 kbar&lt
    , ca. 1000°C) as part of the prograde metamorphism and low-pressure (but still ultrahigh-temperature) M2 metamorphism (9-10 kbar, ca. 1000°C) as part of the retrograde metamorphism during the clockwise pressure-temperature evolution are also recognized. The widely reported Permo-Triassic metamorphic event (ca. 240-260 Ma) from the ultrahigh-temperature metamorphic rocks would indicate a rapid metamorphic evolution from M0 stage to low-pressure and low-temperature retrograde stage (later M2 stage). The recently determined Sm-Nd internal isochron age of 670 Ma for the garnet amphibolite and monazite-CHIME age of ca. 480-500 Ma for the pelitic granulites from the Kannak Complex would also indicate that the Kontum massif had also undergone the Pan-African metamorphic event. The present results indicate that ultrahigh-temperature metamorphic rocks from the Kontum massif are remnants of previously metamorphosed rocks that might be derived from the Gondwana super continent and then re-metamorphosed by the Permo-Triassic metamorphism during the continents collision in eastern Asia.

    DOI: 10.2465/jmps.99.225

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  • Crustal section and anatexis of lower crust due to mantle flux in the Hidaka metamorphic belt, Hokkaido, Japan Reviewed

    Owada , M, Osanai, Y, Shimura, T, Toyoshima, T, Katsui, Y

    Hutton Symposium V, Field Guidebook, Geological Survey of Japan, Interim-Report no. 28   no. 28   81 - 102   2003.12

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  • ベトナムコンツム地塊の変成作用とテクトニクス

    小山内康人, 中野伸彦, 大和田正明, Tran Ngoc Nam, 豊島剛志, 角替敏昭, 加々美寛雄

    月刊地球   25   244 - 250   2003.12

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  • Fluid inclusions in an osumilite-bearing granulite from Bunt Island in the Archean Napier Complex, East Antarctica: implications for a decompressional P-T path? Reviewed

    Tsunogae, T, Santosh, M, Osanai, Y, Owada, M, Toyoshima, T, Hokada, T, Crowe, A. W

    Polar Geoscience   16   61 - 75   2003.12

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  • High fluorine pargasites in ultrahigh temperature granulites From Tonagh island in the Archean Napier Complex, East Antarctica Reviewed

    T Tsunogae, Y Osanai, M Owada, T Toyoshima, T Hokada, WA Crowe

    LITHOS   70 ( 1-2 )   21 - 38   2003.9

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    Pargasites (F/(F + Cl + OH) ratio (X-F) of up to 0.48) from Tonagh Island in Enderby Land, East Antarctica are closely associated with typical high-grade minerals such as orthopyroxene in quartzo-feldspathic, mafic, and ultramafic granulites, and is regarded as a stable mineral at the peak metamorphic conditions (>1100 degreesC) calculated for the ultrahigh-temperature Archean Napier Complex. Although experimental investigations have suggested that the upper thermal stability limit of F-free pargasite is below 1050 degreesC, thermodynamic calculations for the present pargasite +quartz assemblage indicate that the thermal stability limit of pargasite with X-F = 0.5 is about 150 degreesC higher than that of the hydroxyl end member. Fluorine substitution in the pargasite therefore allowed the mineral to survive the ultrahigh-temperature metamorphism at Tonagh Island.
    A positive correlation between the F content of pargasite and coexisting biotite indicates that the minerals approach chemical equilibrium in terms of F-OH distribution. Although the fluorine composition of pargasites (X-F=0.12-0.48) and bulk rock (300-2500 ppm) varies widely, the log(f(H2O)/F-HF) values calculated for these rocks are relatively constant (3.2-3.7), which is consistent with infiltration of an F-bearing fluid during prograde metamorphism. The infiltration of such a fluid is also supported by the higher bulk F content of most of the analyzed samples compared to those of continental and oceanic basaltic rocks, that is, F had been added from an external source. A positive correlation between bulk MgO and F content suggests that F may have been selectively trapped in high-X-Mg pargasite in MgO-rich rocks. (C) 2003 Elsevier B.V. All rights reserved.

    DOI: 10.1016/S0024-4937(03)00087-2

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  • Early Proterozoic tectonothermal events in the Napier Complex, East Antarctica: Implications for the formation of East Gondwana Reviewed

    M. Owada, Y. Osanai, T. Toyoshima, T. Tsunogae, T. Hokada, W. A. Crowe, H. Kagami

    Gondwana Research   6 ( 2 )   231 - 240   2003

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    Sm-Nd internal isochron ages involving retrograde garnet determined from three ultrahigh-temperature (UHT) gneisses taken from Tonagh Island, the western part of the Napier Complex, East Antarctica gave 1870±82 Ma, 1897±50 Ma and 1557±35 Ma. These ages are younger than the late Archaean timing of UHT metamorphism in the Napier Complex. The ca. 1900 Ma age is considered to reflect an important tectonothermal event in the Napier Complex including a tholeiite dyke intrusion. On the other hand, the ca. 1600 Ma age represents a thermal modification lacking signs of deformational events, and separates from the ca. 1900 Ma event. The related East Gondwana fragments such as the Rayner Complex in Antarctica and the Eastern Ghats Belt in India record extensive tectonothermal event of ca. 1400-1600 Ma, and rare indications of ca. 1900-2000 Ma. It is stressed that the assembly of East Gondwana including the Napier Complex, the Rayner Complex, and the Eastern Ghats Belt, if it existed, should be before ca. 1600 Ma, and may be traced back to ca. 2000 Ma of the supercontinent 'Columbia' era.

    DOI: 10.1016/S1342-937X(05)70972-2

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  • SHRIMP geochronology of a mylonite zone on Tonagh Island: characterization of the last high-grade tectonothermal event in the Napier Complex, East Antarctica Reviewed

    Crowe, W. A, Osanai, Y, Toyoshima, T, Owada, M, Tsunogae, T, Hokada, T

    Polar Geoscience   15   17 - 36   2002.12

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  • Very high-density carbonic fluid inclusions in sapphirine-bearing granulites from Tonagh Island in the Archean Napier Complex, East Antarctica: Implications for CO2 infiltration during ultrahigh-temperature “T>1,100 °C” metamorphism Reviewed

    Toshiaki Tsunogae, M. Santosh, Yasuhito Osanai, Masaaki Owada, Tsuyoshi Toyoshima, Tomokazu Hokada

    Contributions to Mineralogy and Petrology   143 ( 3 )   279 - 299   2002

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    The ultrahigh-temperature “UHT” metamorphism of the Napier Complex is characterized by the presence of dry mineral assemblages, the stability of which requires anhydrous conditions. Typically, the presence of the index mineral orthopyroxene in more than one lithology indicates that H2O activities were substantially low. In this study, we investigate a suite of UHT rocks comprising quartzo-feldspathic garnet gneiss, sapphirine granulite, garnet-orthopyroxene gneiss, and magnetite-quartz gneiss from Tonagh Island. High Al contents in orthopyroxene from sapphirine granulite, the presence of an equilibrium sapphirine-quartz assemblage, mesoperthite in quartzo-feldspathic garnet gneiss, and an inverted pigeonite-augite assemblage in magnetite-quartz gneiss indicate that the peak temperature conditions were higher than 1,000 °C. Petrology, mineral phase equilibria, and pressure-temperature computations presented in this study indicate that the Tonagh Island granulites experienced maximum P-T conditions of up to 9 kbar and 1,100 °C, which are comparable with previous P-T estimates for Tonagh and East Tonagh Islands. The textures and mineral reactions preserved by these UHT rocks are consistent with an isobaric cooling “IBC” history probably following an counterclockwise P-T path. We document the occurrence of very high-density CO2-rich fluid inclusions in the UHT rocks from Tonagh Island and characterize their nature, composition, and density from systematic petrographic and microthermometric studies. Our study shows the common presence of carbonic fluid inclusions entrapped within sapphirine, quartz, garnet and orthopyroxene. Analysed fluid inclusions in sapphirine, and some in garnet and quartz, were trapped during mineral growth at UHT conditions as 'primary' inclusions. The melting temperatures of fluids in most cases lie in the range of -56.3 to -57.2 °C, close to the triple point for pure CO2 “-56.6 °C”. The only exceptions are fluid inclusions in magnetite-quartz gneiss, which show slight depression in their melting temperatures “-56.7 to -57.8 °C” suggesting traces of additional fluid species such as N2 in the dominantly CO2-rich fluid. Homogenization of pure CO2 inclusions in the quartzo-feldspathic garnet gneiss, sapphirine granulite, and garnet-orthopyroxene gneiss occurs into the liquid phase at temperatures in the range of -34.9 to + 4.2 °C. This translates into very high CO2 densities in the range of 0.95-1.07 g/cm3. In the garnet-orthopyroxene gneiss, the composition and density of inclusions in the different minerals show systematic variation, with highest homogenization temperatures “lowest density” yielded by inclusions in garnet, as against inclusions with lowest homogenization “high density” in quartz. This could be a reflection of continued recrystallization of quartz with entrapment of late fluids along the IBC path. Very high-density CO2 inclusions in sapphirine associated with quartz in the Tonagh Island rocks provide potential evidence for the involvement of CO2-rich fluids during extreme crustal temperatures associated with UHT metamorphism. The estimated CO2 isochores for sapphirine granulite intersect the counterclockwise P-T trajectory of Tonagh Island rocks at around 6-9 kbar at 1,100 °C, which corresponds to the peak metamorphic conditions of this terrane derived from mineral phase equilibria, and the stability field of sapphirine + quartz. Therefore, we infer that CO2 was the dominant fluid species present during the peak metamorphism in Tonagh Island, and interpret that the fluid inclusions preserve traces of the synmetamorphic fluid from the UHT event. The stability of anhydrous minerals, such as orthopyroxene, in the study area might have been achieved by the lowering of H2O activity through the influx of CO2 at peak metamorphic conditions “&gt
    1,100 °C”. Our microthermometric data support a counterclockwise P-T path for the Napier Complex.

    DOI: 10.1007/s00410-001-0343-4

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  • Ultrahigh temperature sapphirine-osumilite and sapphirine-quartz granulites from Bunt Island in the Napier Complex, East Antarctica--Reconnaissance estimation of P-T evolution Reviewed

    Osanai, Y, Toyoshima, T, Owada, M, Tsunogae, T, Hokada, T, Crowe, W. A

    Polar Geoscience   14   1 - 24   2001.12

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  • Sm-Nd garnet ages of retrograde garnet bearing granulites from Tonagh Island in the Napier Complex, East Antarctica: A preliminary study Reviewed

    Owada, M, Osanai, Y, Tsunogae, Hamamoto, T, Kagami, H, Toyoshima, T, Hokada, T

    Polar Geoscience   14   75 - 87   2001.12

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  • Carbonic fluid inclusions in ultrahigh-temperature metamorphic rocks from Tonagh Island in the Archean Napier Complex, East Antarctica: A preliminary report Reviewed

    Tsunogae, T, Santosh, M, Osanai, Y, Owada, M, Toyoshima, T, Hokada, T, Crowe, A. W, Miyano, T

    Polar Geoscience   14   25 - 38   2001.12

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  • Ultrahigh-Temperature Pelitic Granulites from Kontum Massif, Central Vietnam: Evidence for East Asian Juxtaposition at ca. 250 Ma Reviewed

    Y. Osanai, M. Owada, T. Tsunogae, T. Toyoshima, T. Hokada, T. V. Long, K. Sajeev, N. Nakano

    Gondwana Research   4 ( 4 )   720 - 723   2001

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    DOI: 10.1016/S1342-937X(05)70518-9

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  • Fluorine-rich calcic amphiboles in ultrahigh-temperature mafic granulite from Tonagh Island in the Napier Complex, East Antarctica: Preliminary report Reviewed

    Tsunogae, T, Osanai, Y, Toyoshima, T, Owada, M, Hokada, T, Crowe, A. W

    Polar Geoscience   13   103 - 113   2000.12

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  • LREE-enriched mafic gneiss and meta-ultramafic rock from Tonagh Island in the Napier Complex, East Antarctica Reviewed

    Owada, M, Osanai, Y, Tsunogae, Toyoshima, T, Hokada, T, Crowe, A. W

    Polar Geoscience   13   86 - 101   2000.12

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  • 北海道イドンナップ帯南部に分布する冬島変成岩類の岩石的構成と変形変成史 Reviewed

    三浦路子, 豊島剛志

    地質学論集   52   83 - 102   1999.12

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  • 新潟-福島県境付近の奥只見地域から産出したペルム紀腕足類とその構造地質学的意義 Reviewed

    田澤純一, 新潟県基盤岩研究会

    地質学雑誌   105   729 - 732   1999.12

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    DOI: 10.5575/geosoc.105.729

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  • Metamorphic reactions and preliminary P-T estimates of ultrahigh-temperature mafic granulite from Tonagh Island in the Napier Complex, East Antarctica Reviewed

    Tsunogae, T, Osanai, Y, Toyoshima, T, Owada, M, Hokada, T, Crowe, W.A

    Polar Geoscience   12   71 - 86   1999.12

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  • Geology of ultrahigh-temperature metamorphic rocks from Tonagh Island in the Napier Complex, East Antarctica Reviewed

    Osanai, Y, Toyoshima, T, Owada, M, Tsunogae, T, Hokada, T, Crowe,W. A

    Polar Geoscience   12   1 - 28   1999.12

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  • Deformation of ultrahigh-temperature metamorphic rocks from Tonagh Island in the Napier Complex, East Antarctica Reviewed

    Toyoshima, T, Osanai, Y, Owada, M, Tsunogae, T, Hokada, T, Crowe, W. A

    Polar Geoscience   12   29 - 48   1999.12

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  • Petrology and metamorphism of sapphirine-bearing aluminous gneisses from Tonagh Island in the Napier Complex, East Antarctica Reviewed

    Hokada, T, Osanai, Y, Toyoshima, T, Owada, M, Tsunogae, T, Crowe, W.A

    Polar Geoscience   12   49 - 70   1999.12

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  • Petrography and geochemistry of mafic and ultramafic rocks from Tonagh Island in the Napier Complex, East Antarctica: a preliminary report Reviewed

    Owada, M, Osanai, Y, Toyoshima, T, Tsunogae, T, Hokada, T, Crawe, W. A

    Polar Geoscience   12   87 - 100   1999.12

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  • Mineralogy of scapolite from Skallen in the Lutzow-Holm Bay region, East Antarctica Reviewed

    Kusachi, I, Osanai, Y, Toyoshima, T, Owada, M, Tsunogae, T, Hokada, T, Crowe, W.A

    Polar Geoscience   12   143 - 156   1999.12

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  • Tonalite mylonite formed during crustal exhumation Reviewed

    Toyohima, T

    In Snoke, A. W., Tullis, J. & Todd, V. R. eds., Fault-related Rocks:A Photographic Atlas, Princeton University Press   518 - 519   1998.12

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  • Gabbro mylonite developed along a crustal-scale deollement Reviewed

    Toyohima, T

    In Snoke, A. W., Tullis, J. & Todd, V. R. eds., Fault-related Rocks:A Photographic Atlas, Princeton University Press   426 - 427   1998.12

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  • 日高変成帯の形成テクトニクス Reviewed

    豊島剛志, 小松正幸, 志村俊昭

    地質学論集   47   259 - 277   1997.12

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Books

  • 新潟県連続災害の検証と復興への視点-2004.7.13水害と中越地震の総合的検証

    中越地震新潟大学調査団( Role: Joint author ,  第2部中越地震で,6編執筆)

    新潟大学・中越地震新潟大学調査団  2005.8 

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  • 須原地域の地質.地域地質研究報告(5万分の1地質図幅)

    高橋 浩, 豊島剛志, 志村俊昭, 原 英俊, 竹内圭史, 酒井 彰, 中野 俊( Role: Joint author ,  3-24,地質図)

    産総研地質調査総合センター  2004.12 

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  • Geological map and its explanatory text of Skallen (revised edition), Antarctica. Antarctic Geological Map Series, Sheet 39

    Osanai, Y, Toyoshima, T, Owada, M, Tsunogae, T, Hokada, T, Crowe, A. W, Ikeda, T, Kawakami, T, Kawano, Y, Kawasaki, T, Ishikawa, M, Motoyoshi, Y, Shiraishi, K( Role: Joint author ,  抽出できず)

    National Institute of Polar Reserch  2004.12 

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  • Geological map and its explanatory text of Tonagh Island, Enderby Land, Antarctica. Antarctic Geological Map Series, Sheet 38

    Osanai, Y, Toyoshima, T, Owada, M, Tsunogae, T, Hokada, T, Yoshimura, Y, Miyamoto, T, Motoyoshi, Y, Crowe, A. W, Harley, S. L, Kanao, M, Iwata, M( Role: Joint author ,  抽出できず)

    National Institute of Polar Reserch  2001.12 

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  • カタログ:日本の断層と断層岩

    小坂和夫, 大友幸子, 高木秀雄, 豊島剛志( Role: Sole author ,  16-18,49-50,53-54)

    日本大学文理学部自然科学研究所  1998.12 

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MISC

  • 東ドロンイングモードランド,セールロンダーネ山地地学調査隊報告2007-2008(JARE-49)(共著)

    小山内康人, 豊島剛志, 馬場壮太郎, 外田智千, 中野伸彦, 阿部幹雄, 足立達郎

    南極資料   52   291 - 398   2008.12

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    Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (bulletin of university, research institution)   Publisher:国立極地研究所  

    DOI: 10.15094/00009458

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  • 2004年新潟県中越地震と地下水異常・活構造(共著)

    村山友之, 佐藤早苗, 氏原英敏, 森 友紀, 豊島剛志, 渡部直喜, 和田幸永, 小安孝幸, 播磨雄太, 小林健太, 大川直樹, 小泉尚嗣

    新潟大学災害復興科学センター年報   ( 1 )   155 - 174   2007.12

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  • 2004 年新潟県中越地震震源域周辺における地下水温・水質異常と地下地質構造の関係について(共著)

    豊島剛志, 渡部直喜, 小林健太, 佐藤早苗, 氏原英敏, 小泉尚嗣

    第165回地震予知連絡会会報   75   453 - 457   2006.12

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  • 4.1 新潟県中越地震における地震断層と地表変状の構造地質学的調査および地下水変動調査

    豊島剛志, 小林健太, 岩下享平, 大塚洋之, 佐藤早苗, 氏原英敏, 大川直樹, 大橋聖和, 和田幸永, 小安孝幸, 小河原孝彦, 山本 亮, 渡部直喜, 立石雅昭

    科研費報告書   145 - 156   2005.5

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  • 2.3.2 日高地域における断層岩解析による断層すべり過程の解明

    豊島剛志

    科学技術振興調整費研究成果報告書(陸域震源断層の深部すべり過程のモデル化に関する総合研究)   199 - 226   2004.3

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  • 2.3.4 断層深部の反応動力学的機構および動的すべり機構のモデル化

    田中秀実, 島田耕史, 豊島剛志

    科学技術振興調整費研究成果報告書(陸域震源断層の深部すべり過程のモデル化に関する総合研究)   235 - 256   2004.3

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  • 2.3.4 断層深部の反応動力学的機構および動的すべり機構のモデル化

    田中秀実, 島田耕史, 豊島剛志

    科学技術振興調整費研究成果報告書(陸域震源断層の深部すべり過程のモデル化に関する総合研究)   203 - 223   2003.3

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  • 2.3.2 日高地域における断層岩解析による断層すべり過程の解明

    豊島剛志

    科学技術振興調整費研究成果報告書(陸域震源断層の深部すべり過程のモデル化に関する総合研究)   183 - 195   2003.3

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  • 野外における地殻物質変形の延性-脆性遷移に関する研究

    豊島剛志編

    科研費報告書   2000.3

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Awards

  • 平成17年度日本岩石鉱物鉱床学会第2回論文賞

    2006.6   日本岩石鉱物鉱床学会  

    「Osanai, Y.」「Nakano, N.」「Owada, M.」「Nam, T. N.」「Toyoshima, T.」「Tsunogae, T.」「Binh, P

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    Award type:Award from Japanese society, conference, symposium, etc.  Country:Japan

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Research Projects

  • 新潟県中越地方長岡市及びその周辺地域の活構造

    2010.10 - 2011.3

    国際石油開発帝石株式会社  共同研究(国内共同研究) 

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    Grant type:Competitive

    Grant amount:\1000000

    既存調査報告のレビュー等に基づき,新潟県中越地方長岡市及びその周辺地域での活構造に関する情報収集と整理,考察を行う。

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  • 知識工学的手法を用いた地質環境の長期安定性に関する調査・解析手法の整備に 関する研究

    2010.8 - 2011.2

    独立行政法人日本原子力研究開発機構  共同研究(国内共同研究) 

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    Grant type:Competitive

    Grant amount:\995220

    共同研究では、地形発達モデル及び地質発達モデルの構築に関する地形・地質調査等を対象として、タスクフロー及び意思決定プロセスのフローダイアグラム(意思決定フロー)を作成し、それらの様々な地域への適用性を確認するとともに、教育活動等における利用可能性について検討する。

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  • 地質構造にもとづく潜在震源断層マッピング

    2010.5 - 2013.3

    日本学術振興会  科学研究費助成事業  基盤研究(B)

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    Grant type:Competitive

    Grant amount:\1100000 ( Direct Cost: \770000 、 Indirect Cost:\330000 )

    地質構造解析

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Teaching Experience (researchmap)

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Teaching Experience

  • 理学スタディ・スキルズ

    2022
    Institution name:新潟大学

  • 野外実習B

    2022
    Institution name:新潟大学

  • 地球科学特別講義II

    2022
    Institution name:新潟大学

  • 野外実習I

    2021
    Institution name:新潟大学

  • 論文講読演習

    2020
    Institution name:新潟大学

  • 課題研究(地質科学)

    2020
    Institution name:新潟大学

  • 地質調査法実習III

    2019
    Institution name:新潟大学

  • 野外実習A

    2019
    Institution name:新潟大学

  • 構造地質学入門

    2018
    Institution name:新潟大学

  • 理学スタディ・スキルズ

    2018
    -
    2020
    Institution name:新潟大学

  • 地学基礎実習b

    2017
    Institution name:新潟大学

  • 地質学入門a

    2017
    Institution name:新潟大学

  • フィールド体験実習

    2017
    Institution name:新潟大学

  • 地学基礎実習a

    2017
    Institution name:新潟大学

  • 地球科学特別講義I

    2015
    Institution name:新潟大学

  • 安全教育

    2013
    Institution name:新潟大学

  • 地球物理学

    2013
    Institution name:新潟大学

  • 課題研究(地質科学科)

    2013
    -
    2016
    Institution name:新潟大学

  • 学術発表演習M

    2013
    -
    2015
    Institution name:新潟大学

  • 地球科学演習Mb

    2013
    -
    2015
    Institution name:新潟大学

  • 中間発表M

    2013
    -
    2015
    Institution name:新潟大学

  • 地球科学特定研究Mb

    2013
    -
    2015
    Institution name:新潟大学

  • 地球科学演習Ma

    2013
    -
    2014
    Institution name:新潟大学

  • 地球科学特定研究Ma

    2013
    -
    2014
    Institution name:新潟大学

  • 野外実習II

    2012
    -
    2017
    Institution name:新潟大学

  • 地球科学特定研究Da

    2012
    Institution name:新潟大学

  • 中間発表D

    2012
    Institution name:新潟大学

  • 地球科学特定研究Db

    2012
    Institution name:新潟大学

  • 地球科学特別講義III

    2012
    Institution name:新潟大学

  • Basic Geology

    2012
    Institution name:新潟大学

  • リサーチキャンプ

    2012
    Institution name:新潟大学

  • セミナー

    2011
    Institution name:新潟大学

  • 課題研究

    2011
    Institution name:新潟大学

  • 土木地質学

    2011
    Institution name:新潟大学

  • 応用地質学実習

    2011
    -
    2017
    Institution name:新潟大学

  • 地質学の基礎

    2011
    Institution name:新潟大学

  • 地球科学特別講義IV

    2011
    Institution name:新潟大学

  • 地学基礎A

    2010
    Institution name:新潟大学

  • 自然科学総論Ⅴ

    2010
    -
    2011
    Institution name:新潟大学

  • 地質調査法II

    2007
    Institution name:新潟大学

  • 構造地質学

    2007
    Institution name:新潟大学

  • ジオダイナミクス

    2007
    Institution name:新潟大学

  • 岩圏変形論

    2007
    Institution name:新潟大学

  • 地質調査法I

    2007
    Institution name:新潟大学

  • 地質調査法実習II

    2007
    Institution name:新潟大学

  • 地質調査法実習I

    2007
    Institution name:新潟大学

  • 地質構造解析法

    2007
    Institution name:新潟大学

  • 野外実習I

    2007
    -
    2021
    Institution name:新潟大学

  • 野外実習III

    2007
    -
    2018
    Institution name:新潟大学

  • 地史学原理

    2007
    -
    2017
    Institution name:新潟大学

  • スタディ・スキルズ(地質科学学習法)

    2007
    -
    2016
    Institution name:新潟大学

  • 地球科学特別講義II

    2007
    -
    2012
    Institution name:新潟大学

▶ display all