Collaborative Research: Mantle and Fluid Evolution Across the Izu Arc

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In order to test three hypotheses regarding petrogenetic processes below the Izu arc, the PIs will analyze submarine rocks collected by dredging, ALVIN and ODP legs, and from a future IFREE/JAMSTEC cruise. Under this award, the PIs will study the petrography, mineral chemistry, major and trace elements (XRF, ICPMS), and Sr-Nd-Pb-Hf isotopes of 50-100 basalts, mostly from the extensional region, but also from the volcanic front and rear arc seamount chains. They will also measure 187 Os/ 188 Os ratios and Re-Os concentrations for a suitably mafic subset of these samples, and for the high-priority subset of sediments and basalts from ODP Site 1149 in the Pacific ocean crust outboard of the Izu arc.