Collaborative Research: Volatiles (H2O and CO2) in Mariana and Izu Arc Magmas

推荐的项目是研究伊豆-波宁-马里亚纳（IBM）电弧系统的挥发通量。水和二氧化碳分析将使用傅里叶变换红外光谱（FTIR）方法对橄榄石中的玻璃状包裹体进行分析，激光烧蚀，电感耦合等离子体质谱（LA-ICPMS）对这些包裹体进行微量元素分析，还将在100-800兆帕斯卡的水饱和和欠饱和条件下对IBM玄武岩进行实验相平衡研究。这项工作对于理解电弧系统的质量平衡，解决不稳定通量预算中的关键未知数非常重要。要使用的样品已经很好地表征了。该研究将解决这些样品的减压与通量熔化的相对作用，确定含水条件下的关键相平衡关系，并开发熔体地湿度计来估计IBM熔岩成分中的含水量。

Recommended project is for a study of the volatile flux in the Izu-Bonin-Mariana (IBM) arc system. Water and CO2 analyses will be done using the Fourier Transform Infrared Spectrometry (FTIR) method on glassy inclusions from olivines, laser-ablation, inductively-coupled plasma mass spectrometry (LA-ICPMS) trace element analysis on these same inclusions, and also will do experimental phase equilibrium studies with IBM basalts at pressures ranging from 100-800 megapascals in water saturated and undersaturated conditions. This work is very important for understanding mass balances in arc systems, addressing key unknowns in volatile flux budgets. The samples to be used are already well characterized. The research will address the relative role of decompression versus flux melting for these samples, determine key phase equilibria relationships under hydrous conditions, and develop melt geohygrometers to estimate water contents in IBM lava compositions.