Collaborative Research: Constraining the Volatile and Slab Flux in the Izu-Bonin-Mariana MARGIN Using Geothermal Fluids, Phenocrysts and Melt Inclusions

根据该合同，pi将对伊豆-博宁-马里亚纳边缘的挥发物进行综合研究，包括分析特定挥发物（H2O、CO2、Cl、S）和流体可溶性元素（Li、B、K、Rb、Ba等）及其稳定同位素(d？D, D ?11 b, d ?13 c, d ?18 o d ?34S)利用SIMS测量最近喷发的火山熔体包裹体的系统学。该数据集将由CO2和He丰度和同位素测量（?? ?）补充。d13C和3He/4He)在喷发的phenocys和排放的火山和热液中。此外，该研究将测量完整的气体组成和热液流体的n同位素，以便通过归一化到地面二氧化硫遥感测量来确定整个弧线目前的总挥发通量。综合数据集将使pi能够根据挥发性成分（熔体包裹体数据）量化板块通量，根据海洋基底、俯冲碳酸盐或有机沉积物（CO2-He和N2-He系统）量化板块通量的来源，以及目前从板块和地幔楔块向大气的挥发性通量（SO2通量和火山气体组成）。该研究解决了进出IBM系统的挥发物的通量和组成以及地幔中挥发物的分布及其随时间的地球化学演化。

Under this award, the PIs will carry out an integrated study of volatiles in the Izu-Bonin-Marianas margin that includes the analyses of specific volatiles (H2O, CO2, Cl, S) and fluid soluble elements (Li, B, K, Rb, Ba and others) as well as their stable isotope (?d?D, d?11B, d?13C, d?18O, d?34S) systematics utilizing SIMS measurements of melt inclusions of recently erupted tephra. This data set will be complemented by CO2 and He abundance and isotopic measurements (??d13C and 3He/4He) in erupted phenocysts and discharging volcanic and hydrothermal fluids. Additionally, the study will measure the complete gas composition and the N-isotopes of the hydrothermal fluids in order to determine the present-day total volatile flux from the entire arc through normalization to ground-based SO2 remote sensing measurements. The combined data set will allow the PIs to quantify the slab flux in terms of volatile composition (melt inclusion data), the source of the slab flux in terms of oceanic basement, subducted carbonates or organic sediments (CO2-He and N2-He systematics), the present day volatile flux to the atmosphere from the slab and mantle wedge (SO2 flux and volcanic gas compositions). The study addresses the flux and composition of volatiles into and out of the IBM system and the distribution of volatiles in the mantle and its geochemical evolution through time.