Experimental Investigation of Mineral-Fluid Equilibria at High Pressure

富水流体普遍存在于地壳深部和上地幔。由于矿物在这些环境中的溶解度很高，因此这些流体的释放和迁移会导致显著的传质。俯冲岩石圈产生的流体从板片转移溶质，因此在介导地球化学循环中起着重要作用。捕虏体套件表明，上地幔的显着地区可能会修改通过H2O-CO2-NaCl流体。在地壳变质过程中，富溶质流体可能在物质再分配中起着至关重要的作用。定量了解流体输送物质的过程需要对矿物溶解度有准确的了解。在高压（5千巴）下，实验挑战以前限制了关键数据的可用性;然而，新技术现在使对重要模型系统进行研究成为可能。该项目包括三组旨在更好地了解高压矿物-流体平衡的实验研究：（1）在宽压力和温度范围内研究二氧化硅-聚合物的形成;（2）与钠长石-水系统第二临界终点有关的溶质化学变化的实验;（3）含挥发分相方解石和硬石膏溶解度的表征。这些数据对于了解流体如何参与地球的物质循环至关重要。更广泛的影响将包括学生培训和指导。关于钠长石-钠长石-石英的拟议实验是博士学位的一个组成部分。研究了A.安廷加诺PI还包括来自加州大学洛杉矶分校岩石学研究的不同背景的本科生，导致在专业会议上发表摘要。

ManningEAR-0337170Water-rich fluids are common in the deep crust and upper mantle. Because mineral solubilities are high in these environments, liberation and migration of such fluids causes significant mass transfer. Fluids generated by subducting lithosphere transfer solutes from the slab and therefore play a fundamental role in mediating chemical cycling in the Earth. Xenolith suites show that significant regions of the upper mantle may be modified by passage of H2O-CO2-NaCl fluids. During crustal metamorphism, solute-rich fluids may play a crucial role in the redistributing matter. Quantitative understanding of the processes by which fluids transport material requires accurate knowledge of mineral solubility. At high pressures (5 kbar), experimental challenges have previously limited the availability of key data; however, new techniques now make it possible to carry out studies on important model systems.This project involves three sets of experimental studies of aimed at better understanding high-pressure mineral-fluid equilibria: (1) studies of silica-polymer formation over a broad range of pressure and temperature; (2) experiments on the changes in solute chemistry associated with the second critical end-point in the system albite-water; and (3) characterization of the solubility of the volatile-bearing phases calcite and anhydrite.The intellectual merit of the proposed investigation will be quantitative constraints on the chemistry of aqueous species at high pressure, where existing data are limited. Such data are critical for understanding how fluids participate in the material cycling in the Earth. Broader impacts will include student training and mentoring. The proposed experiments on albite- paragonite-quartz are a component of Ph.D. studies of A. Antingano. The PI has also included undergraduates from diverse backgrounds in petrologic research at UCLA, resulting in published abstracts at professional meetings.