Discovery of sheeted dikes in the Cretaceous accretionary complex of the Idonnappu Zone, Hokkaido, Japan
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概要
- 論文の詳細を見る
A tectonic slice consisting of sheeted dikes has been found in the Oku-Niikappu Dam Complex (ONDC), a mid-Cretaceous accretionary complex in the Idonnappu Zone, Hokkaido. The sheeted dikes are composed of gabbroic to diabasic rocks with relict clinopy-roxenes showing a character of island arc and transitional from arc to oceanic tholeiites. The dikes are considered to have originated from an intraoceanic remnant arc which was finally accreted, forming the ophiolitic assemblage of the ONDC. Pre-subduction exposure of the sheeted dikes in an pelagic environment, as suggested by the presence of gabbroic clasts in the oceanic debrite, allowed accretion of the sheeted dikes to the continental margin.
- 日本地質学会の論文
- 2003-09-15
著者
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Ueda H
Department Of Geology Faculty Of Science Niigata University
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Ueda Hayato
Department Of Geology Faculty Of Science Niigata University
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MIYASHITA Sumio
Department of Geology, Niigata University
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Miyashita S
Department Of Geology Faculty Of Science Niigata University
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Miyashita Sumio
Department Of Geology Faculty Of Science Niigata University
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MIYASHITA Sumio
Department of Geology and Mineralogy, Faculty of Science, Hokkaido Seiji University
関連論文
- The petrological and geochemical characteristics of an ophiolite volcanic suite from the Ghayth area of Oman
- Accretionary complex of remnant-arc origin : Greenstone-conglomerate-chert succession in the Oku-Niikappu area of the Idonnappu Zone, Hokkaido, Japan
- Tectonic accretion of a subducted intraoceanic remnant arc in Cretaceous Hokkaido, Japan, and implications for evolution of the Pacific northwest
- Discovery of sheeted dikes in the Cretaceous accretionary complex of the Idonnappu Zone, Hokkaido, Japan
- Petrology of the greenstones of the Lower Sorachi Group in the Sorachi-Yezo Belt, central Hokkaido, Japan, with special reference to discrimination between oceanic plateau basalts and mid-oceanic ridge basalts
- Sapphirine from Metamorphosed Layered Complex of Mt. Poroshiri, Hidaka Metamorphic Belt, Hokkaido