MARGINS: Constraining the Process of Volatile Transfer from the Subducted Slab to the Surface using Phenocrysts of Recently Erupted Tephras from the Izu-Bonin-Marianas Arc

PI将分析伊豆-波宁-马里亚纳系统熔岩中橄榄石斑晶的氮同位素组成，以扩展他在IBM重点领域对弧火山氮同位素的研究。他以前的工作主要集中在喷气孔和泉水上，但这限制了对活火山的分析。新的方法将使弧线的覆盖范围更广。这些结果将在目前的弧地球化学模型的框架内进行解释，以解决通过板流体或沉积物融化的元素运输的问题。该研究将拓宽n同位素系统在俯冲带的应用范围。该提案具有强大的外展组成部分，并将支持博士生。与日本的国际合作也是一个加分项。

The PI will analyze the isotopic compositions of nitrogen for olivine phenocrysts in lavas from the Izu-Bonin-Mariana system to extend his work on nitrogen isotopes from arc volcanoes in the IBM focus area. His previous work has focused on fumaroles and springs, but this limits analyses to active volcanoes. The new approach will allow much broader coverage of the arc. The results will be interpreted in the framework of current geochemical models of the arc, addressing questions about the element transport via slab fluid or sediment melt. The study will broaden the range of applications for the N-isotope system in subduction zones. The proposal has a strong outreach component and will support a PhD student. International collaboration with Japan is also a plus.