The Kurosegawa serpentinite melange zone and its role in the evolution of southwest Japan.

S. Maruyama

    Research output: Contribution to journalArticle

    5 Citations (Scopus)

    Abstract

    This zone, approx 600 km long, developed obliquely and independently from the parallel arrangement of geological units such as the Ryoke and Sanbagawa belts in the outer zone of SW Japan. Tectonic blocks enveloped wholly or partially by serpentinite are: high-P/low-T schists (352-394 m.y. old); the complex of gneiss, high-P amphibolite and granite (approx 400 m.y.); unmetamorphosed Siluro-Devonian, Carboniferous, Permian and Triassic rocks; schists of the albite-epidote-amphibolite facies (317-327 m.y.); winchite-bearing greenstone, and schists of the jadeite- glaucophane series (208-240 m.y. B.P.). The diversity in lithology and age of the tectonic blocks indicates strong lateral and vertical movements, which would be possible only by subduction zone tectonics. A possible model to explain the existence of the oldest glaucophane schist belt in Japan is the collision of a mature island arc, previously situated further SE of the Japanese islands, at some time after the paired metamorphism of the Sanbagawa-Ryoke belt and before the Cretaceous. -P.Br.

    Original languageEnglish
    Pages (from-to)269-279
    Number of pages11
    JournalMemoir of the Geological Society of China (Taiwan)
    Volume4
    Publication statusPublished - Jan 1 1981

    ASJC Scopus subject areas

    • Environmental Science(all)
    • Earth and Planetary Sciences(all)

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