Garnet-clinopyroxene amphibolite from the Takahama metamorphic rocks, western Kyushu, SW Japan: evidence for high-pressure granulite facies metamorphism

Autor:	Kazuhiro Arima, Hitoshi Yoshida, Kazuhiro Miyazaki, Takeru Yanagi, Tadao Nishiyama, Takeshi Ikeda
Rok vydání:	2005
Předmět:	Geophysics Metamorphic core complex Geothermobarometry Metamorphic rock Geochemistry Metamorphism Geology Isograd Granulite Petrology Metamorphic facies Mylonite
Zdroj:	Journal of Mineralogical and Petrological Sciences. 100:104-115
ISSN:	1349-3825 1345-6296
Popis:	Garnet-clinopyroxene amphibolites occur in the mylonite unit structurally at the top of the Takahama metamorphic rocks — a member of the Nagasaki Metamorphic Rocks, western Kyushu, SW Japan. Geothermobarometry applied to an equigranular garnet-clinopyroxene amphibolite, which escaped severe mylonitization, yields the metamorphic condition of 770 ± 70°C and 1.1 ± 0.2 GPa. This condition is comparable with the high-pressure granulite facies, and is much higher-grade than those of the underlying crystalline schists of the Takahama metamorphic rocks that belong to the epidote-glaucophane schist subfacies. Despite the presence of such a gap in metamorphic condition between the crystalline schists and the mylonite unit, nearly identical muscovite K-Ar ages have been obtained from these units, which indicate that both units were juxtaposed at depth before they cooled below the closure temperature of the muscovite K-Ar system.
Databáze:	OpenAIRE
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