Presentation Information
[R1P-11]Occurrence of zeolites in Tsuo andesite from Nagato City, Yamaguchi Prefecture, Japan
*Mariko Nagashima1, Miyu Nishioka2 (1. Yamaguchi Uni. Sci. Tech. Innov., 2. Yamaguchi Uni. Sci.)
Keywords:
Zeolite,Tsuo andesite,Stilbite,Heulandite
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Occurrence, assemblages and chemical compositions of zeolite and associated amygdale minerals in Tsuo andesite from Nagato, Yamaguchi, Japan were studied. Amygdale minerals including zeolites were described from bottom and middle andesites, and andesite pebbles from the boundary between middle and upper ones. Stilbite was dominant zeolite in bottom andesite, whereas heulandite and mordenite were common in middle andesite and andesite pebbles. As the results of chemical analysis, zeolites formed in early stage enriched in Ca, and those in later stage enriched in Na and K.
Occurrence, assemblages and chemical compositions of zeolite and associated amygdale minerals in Tsuo andesite from Nagato, Yamaguchi, Japan were studied. Amygdale minerals including zeolites were described from bottom and middle andesites, and andesite pebbles from the boundary between middle and upper ones. Stilbite was dominant zeolite in bottom andesite, whereas heulandite and mordenite were common in middle andesite and andesite pebbles. As the results of chemical analysis, zeolites formed in early stage enriched in Ca, and those in later stage enriched in Na and K.