Radiolarians as tracers for provenance of gravels in Lower Cretaceous molasse (Outer Zone of SW Japan)

Keisuke ISHIDA

en Geodiversitas 21 (4) - Pages 637-656

Published on 24 December 1999

This article is a part of the thematic issue InterRad VIII, Paris/Bierville 8-13 septembre 1997

This paper discusses the results and the recent status of the study by radiolarians as tracers for erosional events, especially for those of Jurassic and pre-Jurassic accretionary complexes in the Outer Zone of SW Japan. As a test case to clarify the provenance of radiolarian-bearing gravels in conglomerates, the author reviewed the work previously done to trace the source rocks within oceanic-plate stratigraphy successions from monomictic chert-pebble conglomerates of the Lower Cretaceous Ryoseki-Monobegawa group. The group is a molasse typical of paralic sedimentary facies in the Outer Zone of SW Japan.

Keywords :

Provenance, conglomerate, molasse, radiolarian dating, jurassic accretionary complex, Cretaceous, SW Japan

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