Abstracts for Annual Meeting of Japan Association of Mineralogical Sciences
2016 Annual Meeting of Japan Association of Mineralogical Sciences
Session ID : S1-02
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S1: Igneous processes and fluids
Temperature of the sub-arc mantle constrained by ejecta from Akita-Komagatake volcano
*Chizuko KanaiTakeshi KuritaniMitsuhiro Nakagawa
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Abstract

To constrain the thermal structure of the upper mantle in the NE Japan arc, the conditions of magma generation were estimated for basalts from Akita-Komagatake volcano, using a petrological approach. We estimated that the primary magma was generated by 16% partial melting of the mantle with 0.54 wt.% H2O at 1298°C and 14.2 kbar. This result suggests that the temperature of the sub-arc mantle at 45 km depth is ~1300°C, which is higher than those estimated by geophysical studies by >100°C. 

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© 2016 Japan Association of Mineralogical Sciences
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