Faculty Profiles - WATANABE Naoki

Papers - WATANABE Naoki

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85. Landside Generations by Geopressured Hydrothermal Systems and Neo-tectonic Implication

WATANABE Naoki, OKI Yasue, TATO Osamu

Annual Meeting of the Geological Society of Japan 1995 120 - 120 1995

1992 Tsunan Earthquake of M4.5, Southern Niigata Prefecture

Yasue OKI, Osamu SATO, Shigeru AOKI

Annual report of the Research Institute for Hazards in Snowy Area, Niigata University 16 ( 16 ) 1 - 36 1994.12

448. A Stable Isotopic Study of Groundwaters from the Matsunoyama Landslide Area in Niigata Prefecture.

WATANABE Naoki, OKI Yasue, SATO Osamu, KUSAKABE Minoru

Annual Meeting of the Geological Society of Japan 1994 286 - 286 1994

K-Ar ages of volcanic rocks from the Tomari Area in the Shimokita Peninsula, Northeast Japan Arc. Reviewed

Watanabe N, Takimoto T, Shuto K, Itaya T

Journal of Mineralogy, Petrology and Economic Geology 88 ( 7 ) 352 - 358 1993.7

陸弧火山活動から島弧火山活動へ−東北日本弧第三紀火山活動の時間変遷− Invited

周藤賢治, 大木淳一, 山本和広, 渡部直喜

地質ニュース 464 ( 464 ) 6 - 18 1993.6

K-Ar ages of Miocene Ryozen basalts from the northern margin of the Abukuma Highland, Japan Reviewed

Ohki J, Shuto K, Watanabe N, Itaya T

Journal of Mineralogy, Petrology and Economic Geology 88 ( 6 ) 313 - 319 1993.6

Shifting of the volcanic fronts during Early to Late Miocene in the Northeast Japan arc Reviewed

Jun'ichi Ohki, Naoki Watanabe, Kenji Shuto, Tetsumaru Itaya

Island Arc 2 ( 2 ) 87 - 93 1993

THE RELATIONSHIPS BETWEEN DRASTIC CHANGES IN SR ISOTOPE RATIOS OF MAGMA SOURCES BENEATH THE NE JAPAN ARC AND THE SPREADING OF THE JAPAN SEA BACK-ARC BASIN Reviewed

K SHUTO, J OHKI, H KAGAMI, M YAMAMOTO, N WATANABE, K YAMAMOTO, N ANZAI, T ITAYA

MINERALOGY AND PETROLOGY 49 ( 1-2 ) 71 - 90 1993

東北日本弧の中期中新世（16～12Ma）火山活動とテクトニクス Invited

周藤賢治, 大木淳一, 渡部直喜, 安斎憲夫, 山本和広, 牧野淳史, 猪俣恵理, 滝本俊明, 桑原通泰, 板谷徹丸

松本征夫教授退官記念論文集 333 - 346 1992.4

蛍光Ｘ線分析装置による珪酸塩岩石中のBa，Co，Cr，Vの定量分析

川野良信, 渡部直喜, 山本和広, 周藤賢治

新潟大学理学部地質鉱物教室研究報告 ( 7 ) 111 - 115 1992.3

Large Scale Landslides Generated by Geopressured Hydrothermal System in Matsunoyama, Niigata Prefecture

OKI Yasue, WASHIZU Fuminari, SATO Osamu, WATANABE Naoki

PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN 1992 99 - 99 1992

奥尻島の第三紀火山岩のＫ−Ａｒ年代と東北日本弧周辺の漸新世および前期中新世火山岩の岩石学的特徴 Reviewed

山本和広, 周藤賢治, 渡部直喜, 板谷徹丸, 加々美寛雄

日本岩石鉱物鉱床学会誌 86 ( 11 ) 507 - 521 1991.11

Petrology of Asakusa Volcano Reviewed

Asakusa Volcano Collaborative Research Group

Earth Science (Chikyu Kagaku) 45 ( 2 ) 113 - 130 1991.3

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Association for the Geological Collaboration in Japan

The rocks from Asakusa volcano, Northeast Japan, are described, and the representative 76 samples were chemically analyzed. Asakusa Volcano Collaborative Research Group (1991) divided the geologic history of the volcano into main two stages, early and late stages. The late stage activity formed the principal edifice of the volcano and is further subdivided into four stages. The rocks of the volcano are composed mostly of the rock suites ranging from basalt to andesite with minor amounts of dacite and all the samples are porphyritic with 20-50 vol. % of phenocrysts. The early stage rocks are composed of andesite of Kuno's (1950) hypersthenic rock series (H series), containing phenocrysts of hornblende together with pyroxene. The rock suite of the first stage consists mainly of andesite and basalt, belonging to both Kuno's pigeonitic rock series (P series) and H series, with minor amounts of dacite of H series. Hornblende phenocrysts are also found in the dacite. The second stage volcanic products are composed largely of andesite and basalt, corresponding to both P and H series. Hornblende phenocrysts are present in andesite erupted in the early period of this stage, but phenocrystic hydrous minerals are absent in one formed in the late period. The volcanic products of both the third and fourth stages are made up basalt and andesite without phenocrystic hydrous minerals. They are of both P and H series. The major and trace element chemical characteristics of the rocks from Asakusa volcano are as follows: 1) In the FeO^*/MgO-SiO_2 diagram, the rocks of each stage mostly plot in the field of the tholeiitic series regardless of P or H series and represent similar differentiation trend. 2) They generally plot on around the boundary between the two fields of the low-alkalitholeiite and high-alkalitholeiite series by Kuno (1968) in total alkalies vs. SiO_2 diagram. 3) All of the rocks also plot in the midway region of the field of Gill's (1981) medium-K andesites and its extention in K_2O vs. SiO_2 diagram. 4) The basaltic rocks from the volcano show the incompatible element characteristics typical of island are basalts, indicating the positive Rb, K and Rb anomalies and the negative Zr, Ti and Y anomalies on the N-type MORE normalized pattern for incompatible elements. Although Asakusa volcano is situated in the Moriyoshi volcanic zone, the volcano has the petrographical and chemical characteristics similar to those of both Moriyoshi and Chokai volcanoes according to the comparative examination of LIL element compositions (Na_2O+K_2O, K_2O, Rb, Sr) and petrography among three volcanoes.

DOI： 10.15080/agcjchikyukagaku.45.2_113

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Geology of Asakusa Volcano Reviewed

Asakusa Volcano Collaborative Research Group

Earth Science (Chikyu Kagaku) 45 ( 2 ) 101 - 112 1991.3

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Association for the Geological Collaboration in Japan

Geological study on Asakusa volcano located on the southern part of Moriyoshi volcanic zone in the Northeast Japan arc has been carried out to construct the volcanic history. The volcano had been active in the middle Pleistocene age arid ejected about 6km^3 of the volcanic materials. Volcariism of this volcano began with eruption of minor amounts of lava flows (early stage lava flows), followed by development of the principal constituents of the volcano. The volcanic history of its principal constituents is summarized as follows. Stage 1: Major lava flows and associated pyroclastic flows erupted from a central vent to form a cone-shaped stratovolcano. The estimated volume of the volcanic product is about 2.5km^3. The rocks are composed mainly of andesite and basalt, with augite, hypersthene and sometimes olivine phenocrysts, which is accompanied by a small amount of dacite with phenocrysts of hornblende, augite and hypersthene. Stage II: Central eruption of large amounts of pyroclastic flows and subordinate lava flows also occurred and the stratovolcano built by the first stage volcanism was further grown. The volume of the volcanic edifice is estimated to be about 3 km^3. Andesite with phenocrysts of hornblende, hypersthene and augite was erupted in the early period of this stage, which was followed by eruptions of pyroxene-olivine basalt and pyroxene andesite. The central vents were situated in the uppermost stream of the Tadamizawa Valley throughout the first to second stage. Stage III: After completion of the stratovolcano, small eruptions of lavas composed largely of olivine bearing pyroxene basalt and andesite, and pyroxene andesite occurred from several vents and these lava flows covered the northern and southern flanks of the volcano. Stage IV: Small eruptions of lava flows and pyroclastic flows occurred and their products mainly covered the northern flank. The erupted materials are basalt and andesite containing phenocryst minerals same as those of the rocks in Stage III. Total volume of the volcanic edifice in Stages III and IV amounted roughly to 0.5km^3.

DOI： 10.15080/agcjchikyukagaku.45.2_101

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247 Petrology of Tappi Volcanic Rocks, Tsugaru Peninsula.

WATANABE Naoki

Annual Meeting of the Geological Society of Japan 1991 376 - 376 1991

41 Miocene volcanism and K-Ar ages in Tappi area of the Tsugaru Peninsula

Watanabe Naoki, Itaya Tetsumaru

Annual Meeting of the Geological Society of Japan 1990 172 - 172 1990

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