K-Ar age of high magnesium andesite dikes at the Toki River in Gifu Prefecture, central Japan

Autor:	Hidehisa Mashima, Atsushi Tanase, Koji Umeda, Atusi Ninomiya, Teruki Oikawa
Rok vydání:	2006
Předmět:	Dike geography geography.geographical_feature_category Andesite General Engineering Geochemistry Cretaceous Intrusion Dike swarm Magmatism High magnesium General Earth and Planetary Sciences Geomorphology Geology General Environmental Science
Zdroj:	The Journal of the Geological Society of Japan. 112:616-619
ISSN:	1349-9963 0016-7630
DOI:	10.5575/geosoc.112.616
Popis:	A high-magnesium andesite dike swarm intruding into the Jurassic melange of the Mino-Tamba Belt and the Cretaceous Toki Granite is exposed along the Toki River in central Japan. At the time of intrusion, the direction of the maximum horizontal compressive stress was E-W in this area, as indicated by the predominant direction of the dike swarm. New K-Ar age dating suggests that the intrusive age of the dike swarm is 60-70 Ma. We point out of possibility that high-magnesium andesite magmatism occurred at 60-70 Ma in the eastern part of Inner Zone of Southwest Japan.
Databáze:	OpenAIRE
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