Collaborative Research: Mantle and Fluid Evolution Across the Izu Arc

为了检验关于伊豆弧下岩石形成过程的三个假设，PI将分析通过疏浚、ALVIN和ODP腿以及未来IFREE/JAMSTEC巡航收集的海底岩石。根据该合同，研究员将研究50-100个玄武岩的岩相学、矿物化学、主要和微量元素（XRF、ICPMS）以及Sr-Nd-Pb-Hf同位素，这些玄武岩大多来自伸展区域，但也来自火山前弧和后弧海山链。他们还将测量这些样品中一个适当的镁铁质子集的187 Os/ 188 Os比值和Re-Os浓度，以及伊豆弧外太平洋地壳ODP 1149站点的沉积物和玄武岩的高优先子集。

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.