Abstracts for Annual Meeting of Japan Association of Mineralogical Sciences
2015 Annual Meeting of Japan Association of Mineralogical Sciences
Session ID : S1-04
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S1: Igneous processes and fluids
Melt ponds dragged by lithosphere regulate petit-spot volcanism
*Shiki MachidaNaoto HiranoHirochika SuminoTakafumi HirataShigekazu YonedaYasuhiro Kato
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Abstract

Petit-spot volcanism is a phenomenon ubiquitous on Earth occurring where the plate flexes and fractures. To define the geological characteristics of petit-spot volcanoes in the northwestern Pacific, we constructed a comprehensive dataset of geochemistry and 40Ar/39Ar ages of alkaline basaltic rocks and glasses collected from three volcanic fields. This dataset and observed temporal migration of vent fields indicate that the magma originates from isolated melt ponds at the lithosphere–asthenosphere boundary, and that the speed at which the melt ponds are dragged by the plate is only slightly slower than that of the plate motion.

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© 2015 Japan Association of Mineralogical Sciences
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