Amphibole Chemistry of Jurassic and Cretaceous Granitic Rocks in South Korea:1. Pressure and Temperature of Intrusions
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概要
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In South Korea granitic rocks are mainly Jurassic and Cretaceous, but some are Paleogene. A new geobarometer based on aluminum in amphibole and a new amphibole-plagioclase geothermometer have been proposed by several articles. Amphibole and plagioclase analyses have been carried out for ten samples of Jurassic and Cretaceous granitic rocks utilizing an electron dispersive X-ray analyzer. The amphibole geobarometer of JOHNSON and RUTHERFORD (1989) indicates that Jurassic granitic rocks range 2.5-6.3 kbar and Cretaceous ones range 2-4.2 kbar. The equilibration temperature of amphiboleplagioclase (BLUNDY and HOLLAND, 1990) for Jurassic granitic rocks range 700-790°C and Cretaceous ones range 680-770°C. Therefore, it is suggested that the Jurassic granitic rocks are exposed the lower level of batholiths compared with Cretaceous plutons at the present erosional level.
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