[R7P-01] Petrography of syenite from Hakata Island, Geiyo Islands, Ehime Prefecture, Japan. | 2022 Annual Meeting of Japan Association of Mineralogical Sciences (JAMS)

2022 Annual Meeting of Japan Association of Mineralogical Sciences (JAMS)

Sep 17 - Sep 19, 2022新潟大学五十嵐キャンパス

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2022 Annual Meeting of Japan Association of Mineralogical Sciences (JAMS)

Sep 17 - Sep 19, 2022新潟大学五十嵐キャンパス

[R7P-01]Petrography of syenite from Hakata Island, Geiyo Islands, Ehime Prefecture, Japan.[Presentation award entry]

*Toko FUKUI¹, Satoshi SAITO¹(1. Graduate School of Science and Engineering, Ehime University )

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Keywords:

Syenite,Hakata Island,metasomatic alteration

In this study, we describe field occurrences, petrographic characteristics and whole-rock chemical compositions of syenite in Hakata Island, Geiyo Islands, Ehime Prefecture, Japan. Gradual lithological variation is observed at the boundary of the syenite and surrounding granites. Aggregates of fine-grained clinopyroxene and garnet are observed. The syenite have higher Na₂O contents compared to granites in the island. These observations are suggestive of syenite formation through metasomatic reactions by Na-rich hydrothermal fluids.

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