南蔵王不忘山産玄武岩質安山岩に含まれる灰長石巨晶とその包有物が示唆する深部マグマの揮発性成分

越後 拓也; 西間木 志野; 谷口 直暉; 木股 三善; 清水 雅浩; 齋藤 静夫; 西田 憲正

doi:10.14824/jakoka.2015.0_2

2015 Annual Meeting of Japan Association of Mineralogical Sciences

Session ID : S1-02

DOI https://doi.org/10.14824/jakoka.2015.0_2

Conference information

Host: Japan Association of Mineralogical Sciences

S1: Igneous processes and fluids

Volatile components in deep magma indicated by anorthite megacryst and its inclusions from Mt. Fubo, Miyagi Prefecture

*Takuya Echigo, Shino Nishimaki, Naoki Taniguchi, Mitsuyoshi Kimata, Masahiro Shimizu, Shizuo Saito, Norimasa Nishida

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Keywords: Anorthite, Megacryst, Sulfide inclusion, Volatile components

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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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