Abstracts for Annual Meeting of Japan Association of Mineralogical Sciences
2015 Annual Meeting of Japan Association of Mineralogical Sciences
Session ID : S1-01
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S1: Igneous processes and fluids
Across-arc noble gas and halogen variations of slab-derived fluids in the Izu-Ogasawara subduction zone
*Hirochika SuminoRay BurgessLisa JepsonDeborah ChavritAya ShimizuShiki MachidaChris Ballentine
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To verify whether and how slab-derived fluids may modify the composition of the mantle beneath subduction zones, we determined the noble gas and halogen compositions of olivines in arc lavas from the northern Izu-Ogasawara subduction zone and IODP sediments and basalts recovered from the northwestern margin of the Pacific plate.
Across arc variations in Ar isotope ratios and halogen compositions suggest that halogen-poor fluid associated with atmospheric noble gases may be predominantly released from the subducting slab beneath the arc, whilst halogen-rich fluid is released at greater depths and is a significant contributor to the magmas of some rear-arc volcanoes.

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© 2015 Japan Association of Mineralogical Sciences
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