Abstracts for Annual Meeting of Japan Association of Mineralogical Sciences
2015 Annual Meeting of Japan Association of Mineralogical Sciences
Session ID : S1-02
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S1: Igneous processes and fluids
Volatile components in deep magma indicated by anorthite megacryst and its inclusions from Mt. Fubo, Miyagi Prefecture
*Takuya EchigoShino NishimakiNaoki TaniguchiMitsuyoshi KimataMasahiro ShimizuShizuo SaitoNorimasa Nishida
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Abstract

Anorthite megacrysts in basaltic andesite from Mt. Fubo, Miyagi Prefecture were examined by EPMA-WDS and SEM-EDS. These observations revealed that anorthite contents of the megacrysts are An92-94 and small Fe-Ni-sulfides (20-50µm) were included in the megacrysts. Our results indicate that these megacrysts have grown in volatile (e.g., H2O and S) rich and low viscosity condition.

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© 2015 Japan Association of Mineralogical Sciences
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