Abstract
Recent K-Ar age data of fault gouge from some active faults in central Japan clarified that shattering and gouge formation induced by the fault movement occurred in the time of Late Cretaceous-Early Paleogene, synchronous with the ages of granite intrusion around the faults. Close spatial association of the faults and granitic intrusion suggests some causal relation between them. Optical observations of granitic rocks around the Atotsugawa and Atera faults demonstrate that grain boundary migration and brittle-ductile deformation are commonly found in the granitic rocks. Based upon the close association of granitic rocks with the faults, a tectonic model of granite intrusion is proposed. In this model, granite intrusion was syntectonically induced at gaps formed by block rotations due to strike-slip faulting. We suggest that fault activities provide a favorable tectonic setting for granite intrusion in central Japan.
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Schedule a callMore From: Zisin (Journal of the Seismological Society of Japan. 2nd ser.)
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