2004 Fiscal Year Final Research Report Summary
Petrologic study on the Paleozoic ophiolites and high-P metamorphic rocks in Japan (especially in the Joetsu belt)
| Project/Area Number |
14540447
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Petrology/Mineralogy/Science of ore deposit
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| Research Institution | Kanazawa University |
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Principal Investigator |
ISHIWATARI Akira Kanazawa University, Graduate School of Natural Science and Technology, Professor, 大学院・自然科学研究科, 教授 (90184572)
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| Project Period (FY) |
2002 – 2004
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| Keywords | Joetsu metamorphic belt / Mino-Tamba belt / Picrite and meimechite / Ultramafic volcanic rocks / Jurassic superplume / Alaskan-type plutons / Yakuno ophiolite / East Asian accretionary complexes |
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| Research Abstract |
Ishiwatari & Tsujimori (2003) synthesized the time-space distribution of ophiolites and high-P metamorphic rocks in Japan and Russian Primorye, and concluded geological continuity between the two areas before the Miocene opening of the Sea of Japan. They further postulated a hypothesis that the Japanese Late Paleozoic ophiolites and high-P metamorphic belts extend to the west to the Chinese Sulu-Dabie collision zone via Yaeyama (western Ryukyu Islands), detouring Korea. Ishiwatari, Sokolov & Vysotskiy (2003) found that ophiolites in Japan and Russian Far East are characterized by common occurrence of highly depleted harzburgite and opx-type cumulate, and postulated that the Mariana-type ophiolite (and blueschist) formation and the Nankai-type accretion of sediments repeated one after another through the Phanerozoic time, resulting in the multiple ophiolite belts. Ichiyama & Ishiwatari (2004) studied the Yakuno ophiolite in the Yakuno Town area, and concluded that this ophiolite formed
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in a back-arc environment, not in an oceanic plateau as postulated by some geologists. Ishiwatari & Ichiyama (2004) compiled geologic and petrologic data about ultramafic lavas and the Alaskan-type intrusive rocks occurring in the accretionary complexes in Japan, Russian Primorye and Sakhalin, and northeastern China, and concluded that these peculiar rocks may have formed by a superplume magmatism of 2,000 km diameter which hit subductien zones in the East Asian margin in the Jurassic time, though some of them represent Permian superplume activity in an oceanic environment. Ichiyama & Ishiwatari (2005) reported a HFSE-rich picrite (meimechite) sills and hyaloclastites intercalated in the Late Permian chert sequence overlying a huge limestone-greenstone body of Mt. Funafuse-yama in the Mine belt, a Jurassic accretionary complex. They find that the magma resembles ultramafic magmas in the Permian Siberian LIP, and postulated a superplume-related, HIMU-source origin. Shimizu & Ishiwatari (in preparation) studied Late Paleozoic high-pressure metamorphic rocks (glaucophane schist and pelitic schist) of the Joetsu belt, and concluded that the belt consisted of a combination of high-P and medium-P metamorphic belts. Less
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[Journal Article] Petrological diversity and origin of ophiolites in Japan and Far East Russia with emphasis on depleted harzburgite2003
Author(s)
Ishiwatari, A., Sokolov, S.D., Vysotskiy, S.V.
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Journal Title
Ophiolites in Earth History(Dilek, Y., Robinson, P.T. (eds))(Geological Society, London, Special Publications) 218
Pages: 597-617
Description
「研究成果報告書概要(和文)」より
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[Journal Article] Petrologic diversity and origin of ophiolites in Japan and Far East Russia with emphasis on depleted harzburgite.2003
Author(s)
Ishiwatari, A., Sokolov, S.D., Vysotskiy, S.V.
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Journal Title
Ophiolites in Earth History (Dilek, Y., Robinson, P.T.(eds)) (Geological Society, London, Special Publications) vol.218
Pages: 597-617
Description
「研究成果報告書概要(欧文)」より
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[Book] 夜久野町史 夜久野岩類2005
Author(s)
石渡 明, 市山祐司
Total Pages
22(777)
Publisher
京都府天田郡夜久野町 町史編纂室
Description
「研究成果報告書概要(和文)」より
