Journal of the Faculty of Science, Hokkaido University. Series 4, Geology and mineralogy;Vol.XXI, No.2

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The Iwanai Nappe in the Kamuikotan Tectonic Belt, Sothern Hokkaido, Japan

Jolivet, Laurent;Cadet, Jean-Paul

Permalink : http://hdl.handle.net/2115/36731

Abstract

The Sarugawa ultramafic mass is interpreted as a nappe here called the "Iwanai Nappe", resting, with its sedimentary cover, on a unit reworking ophiolitic rocks and Cretaceous Yezo deposits. The Iwanai Nappe has been emplaced toward the south-west from an area situated east of the "Yezo Syncline". The age of movement is inferred to be Eocene, contemporaneous with the beginning of the strike-slip movement in Hidaka belt. This structure is a good explanation for the Lower Cretaceous facies distribution in the concerned area.

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