| Project/Area Number |
63540615
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
地質学一般
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| Research Institution | University of the Ryukyus |
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Principal Investigator |
YAMAMOTO Satoshi Ryukyu University, Department of Oceanography, Assistant Professor, 理学部, 助手 (50124855)
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| Project Period (FY) |
1988 – 1989
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| Project Status |
Completed (Fiscal Year 1989)
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| Budget Amount *help |
¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 1989: ¥300,000 (Direct Cost: ¥300,000)
Fiscal Year 1988: ¥1,100,000 (Direct Cost: ¥1,100,000)
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| Keywords | Pelagic cherts / Hemipelagic cherts / Correlation between Fe and Mg / CCD / Red cherts / Flint / Pelagic seamount / 半遠洋性 / 層状赤色チャ-ト / フリントノジュ-ル / CCD / 多色性層状チャ-ト / 深海 / 遠洋粘土 / 層状チャート / 化学組成 / 原子吸光法 / ミクライト質石灰岩 |
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| Research Abstract |
Geochemical analyses on 172 cherts and associated sedimentary rocks from the Okinawa Islands and Hokkaido reveal some geochemical characteristics for pelagic and hemipelagic cherts. Excluding some local basal cherts above the hyaloclastite, pelagic cherts are characterized by a continuous linear plots with high correlation between Fe and Mg. As well, the correlation between Fe and K is high for pelagic cherts. On the other hand, the hemipelagic cherts are characterized by poor correlations among Fe, Mg, and K.
Jurassic to Cretaceous pelagic cherts, both as bedded red cherts in the abyssal floor below the CCD and as nodular flints on the pelagic seamount above the CCD, are exposed in the Ie Island and Hokkaido. The pelagic bedded red cherts occur as monotonous and continuous red cherts in the stratigraphic succession. The stratigrap of these pelagic cherts on the land is well correlated with the stratigraphy of pelagic cherts, both as cherts below the CCD and as above the CCD, in modern deep-se floors.
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