Solubility of Hydrogen in Al-bearing Silicate Perovskites

这项工作将研究水是如何在下地幔中储存和分布的。实验将在660公里地震速度不连续区进行，以了解氢在铝钙钛矿中的溶解度、压力对羟基带的影响以及水对相变的影响。这些数据对于理解钙钛矿结构中三价离子和氢结合的取代机制以及下地幔中控制地幔过程的缺陷化学至关重要。这项拟议的研究是PI通过实验和热力学模型不断努力了解下地幔的化学和矿物学的一个组成部分。该项目将为研究生（作为博士前研究员）提供获得研究经验的机会。本项目合成的硅酸盐钙钛矿大单晶将可供社区其他研究人员使用。拟议研究的结果将主要通过科学期刊的出版物和参加科学会议来传播。预期结果将在岩石学、矿物物理学、地球化学、地震学和地球动力学等许多不同领域产生广泛影响。

This work will study how water is stored and distributed in the lower mantle. Experiments will be performed to understand the solubility of hydrogen in aluminous perovskites, the effect of pressure on the hydroxyl bands, and the effect of water on phase transformations at the 660-km seismic velocity discontinuity. These data are critically important for understanding substitution mechanisms for the incorporation of trivalent ions and hydrogen in the perovskite structure, and the defect chemistry in the lower mantle that controls the mantle processes. The proposed research is an integral part of the PI's continuous efforts to understand the chemistry and mineralogy of the lower mantle through experimentation and thermodynamic modeling. The project will provide opportunities for graduate students (as pre-doctoral fellows) to gain research experience. The large single crystals of silicate perovskites synthesized in this project will be available for other researchers in the community. Results from the proposed study will be disseminated primarily through publications in scientific journals, and by participation at scientific conferences. The expected results will have broad impact in many different fields including petrology, mineral physics, geochemistry, seismology and geodynamics.