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

Knittle摘要研究人员的高压研究旨在限制地球内部挥发物（特别是水，氢，碳和氮）的行为。其目标是获得以下方面的限制：（1）地球核心的挥发物含量，从含挥发物的铁合金的高压行为中评估;（2）氢和碳如何在地幔条件下结合成结晶组合;（3）高压下富含挥发物的岩浆的结构和性质。在这项工作中采用的方法结合联合收割机振动光谱（红外和拉曼光谱）和X射线衍射作为探针的样品内的金刚石砧单元，产生超高压。在高压下的加热是通过外部加热器或激光加热样品来完成的。 拟议实验的智力价值包括对地球的碳和氢收支产生基本的见解;评估大气和水圈成分从地球内部脱气然后通过俯冲重新引入地球的方法;地球富铁核心的相位关系和特性。这项研究的更广泛影响包括更好地了解地球海洋和大气的起源，以及制定一个框架，用于评估两种最丰富的宇宙化学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.