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

国际和平研究所将分析伊豆-博宁-马里亚纳系统熔岩中橄榄石斑晶的氮同位素组成，以扩大他在IBM重点区域弧形火山的氮同位素工作。他之前的工作集中在喷气孔和泉水上，但这将分析限制在活火山上。新的方法将允许更广泛的ARC覆盖范围。结果将在目前的弧化探模型框架内进行解释，解决有关元素通过板条流体或沉积物熔体运输的问题。这项研究将扩大氮同位素系统在俯冲带中的应用范围。该提案有很强的外展成分，将支持一名博士生。与日本的国际合作也是一个加分。

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.