Experimental Studies of Volatile-Bearing Minerals and Rocks Relevant to Subduction Zones, the Mantle and Core

研究者的高压研究方向是限制地球内挥发物（特别是水、氢、碳和氮）的行为。目标是得出以下约束条件：(1)根据含挥发物铁合金的高压行为来评估地核的挥发物含量；(2)氢和碳如何在地幔条件下结合成结晶组合；(3)高压下富挥发物岩浆的结构和性质。这项工作中采用的方法结合了振动光谱（红外和拉曼光谱）和x射线衍射，作为金刚石砧细胞内样品的探针，产生超高压。高压加热是通过外部加热器或激光加热样品来完成的。拟议中的实验的智力价值包括：对地球的碳和氢预算产生根本性的见解；评估大气和水圈成分从地球内部脱气然后通过俯冲重新进入地球的方法；以及富含铁的地核的相位关系和性质。这项研究更广泛的影响包括更好地理解地球海洋和大气的起源，以及建立一个框架来评估两种宇宙化学上最丰富的元素，氢和碳，在行星内部极端条件下的行为。

EAR-0310342Knittle AbstractThe investigator's high pressure studies are oriented towards constraining the behavior of volatiles (particularly water, hydrogen, carbon and nitrogen) within planet Earth. The objectives are to derive constraints on: (1) the volatile content of Earth's core, as evaluated from the high pressure behavior of volatile-bearing iron alloys; (2) how hydrogen and carbon are bound into crystalline assemblages at mantle conditions; and (3) the structure and properties of volatile-rich magmas at high pressures. The methods employed in this work combine vibrational spectroscopy (infrared and Raman spectroscopies) and x-ray diffraction as probes of samples held within the diamond anvil cell, which generate ultra-high pressures. Heating at high pressures is accomplished with either external heaters or laser-heating of samples. The intellectual merits of the proposed experiments include producing fundamental insights into the carbon and hydrogen budgets of planet Earth; evaluating the means by which atmospheric and hydrospheric constituents are degassed from the Earth's interior and then reintroduced into the planet through subduction; and the phase relations and properties of Earth's iron-rich core. The broader impacts of this study includes developing a better understanding of the genesis of Earth's oceans and atmosphere, as well as developing a framework for assessing how two of the most cosmochemically abundant elements, hydrogen and carbon, behave under the extreme conditions of planetary interiors.