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An initial continental margin plutonism — Cretaceous Older Ryoke granitoids, southwest Japan

Published online by Cambridge University Press:  01 May 2009

Toshio Kutsukake
Toshio Kutsukake
Affiliation:
Laboratory of Geological Sciences, College of General Education, Aichi University, Toyohashi, 441, Japan
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Abstract

The emplacement of the Older Ryoke granitoids took place in the Mid-Cretaceous Period in the outermost side of the Inner Zone of southwest Japan, which was located at the eastern margin of the Eurasian Continent before the opening of the Japan Sea. The Ryoke Belt constitutes a long segment of the Cretaceous to Palaeogene felsic magmatic belt of Pacific Asia. The Older Ryoke granitoids represent its initial magmatism, related to the subduction of an oceanic plate underneath the Eurasian plate in that time. Their magmas were generated in the lower to middle crust beneath the Ryoke Belt in the subduction regime. They were emplaced during the Ryoke regional metamorphism and converted to orthogneisses.

Type
Articles
Information
Geological Magazine , Volume 130 , Issue 1 , January 1993 , pp. 15 - 28
Copyright
Copyright © Cambridge University Press 1993

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