Abstracts for Annual Meeting of Japan Association of Mineralogical Sciences
2015 Annual Meeting of Japan Association of Mineralogical Sciences
Session ID : R1-05
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R1: Characterization and description of minerals
Hydrothermal alteration in Nagatare pegmatite, Fukuoka Prefecture
*Yohei ShiroseSeiichiro Uehara
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Abstract

We studied about alteration textures of K-feldspar, petalite, Li-tourmaline and montebrasite-amblygonite, and discussed the alteration processes. K-feldspar was altered to cookeite, muscovite and quartz, or tosudite and beidellite-montmorillonite. Petalite was altered to cookeite and montmorillonite-beidellite. Li-tourmaline was altered to cookeite and muscovite. Montebrasite-amblygonite was altered to various phosphates and muscovite. With decreasing temperature, Li-chroritization, sericitization and smectitization had occured. In acidic condition, K-feldspar and petalite had breakdown, and cookeite formed with releasing K+. In acidic to neutral condition, Li-tourmaline had breakdown, and suffered sericitization. It is estimated that Li, B, P and F escape from pegmatite rock with reaction fluids.

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© 2015 Japan Association of Mineralogical Sciences
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