Abstracts for Annual Meeting of Japan Association of Mineralogical Sciences
2015 Annual Meeting of Japan Association of Mineralogical Sciences
Session ID : S1-03
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S1: Igneous processes and fluids
Uptaking of plagioclase xenocrist into H2O-rich rear-arc basaltic magma
*Morihisa Hamada
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Abstract

Hydrogen concentration of plagioclase xenocrysts in scoriae from the Sannnome-gata volcano, a rear-arc volcano in the northeast Japan arc, was analyzed to understand uptaking process of plagioclase xenocryst (An30) into high-MgO (>8 wt.%) basaltic melt before the eruption. Hydrogen concentration of the outer core of plagioclase is >200 wt. ppm H2O, while that of inner core is 60 wt. ppm H2O. This observation suggests that plagioclase xenocryst was in contact with H2O-rich basaltic melt for a couple of hours before the eruption and that the primary magma of the rear-arc volcano is H2O-rich as well as that of frontal-arc volcano.

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© 2015 Japan Association of Mineralogical Sciences
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