Slab-Related and Volatile-Bearing Materials and the Core's Light Alloying Component

研究人员计划进行一系列实验，以限制地球内挥发性元素（尤其是氢和碳）的行为。他们将在高压和高温下评估含铁碳和铁氢三元体系的弹性和结构行为，目的是确定这些成分是否在地核中丰富。至于地幔，他们将研究太古代火山岩成分的相行为和弹性，以便约束地球历史上俯冲物质的行为。这些研究的目的是了解地球历史早期推动俯冲的过程是否与今天的过程相似。最后，研究人员将在高压下探测与俯冲有关的含水和碳酸相的性质，重点关注那些已知在高压下稳定存在于玄武岩或海洋沉积物组合中的矿物，或者那些已经被观察到存在于地幔源捕虏体中的矿物。该方法旨在提供一个综合数据集，以约束地球大气和水圈中丰富的元素如何循环进入，保留在地球内部，并从地球深处脱气。

Knittle EAR-0087540 The investigators plan to conduct a suite of experiments oriented toward constraining the behavior of volatile elements (especially hydrogen and carbon) within planet Earth. They will assess the elastic and structural behavior of ternary iron-carbon and iron-hydrogen bearing systems at high pressures and temperatures, with the goal of determining whether such compositions could be abundant within Earth's core. With respect to Earth's mantle, they will examine the phase behavior and elasticity of likely Archean volcanic rock compositions, in order to constrain the behavior of subducted material through Earth history. The goal with these studies is to understand whether the processes driving subduction early in Earth history are similar to those that operate today. Finally, the investigators will probe the properties of subduction-related hydrous and carbonated phases at high pressures, focusing on minerals that are either known to be stable in basalt- or oceanic sediment-derived assemblages at high pressure, or those that have actually been observed to occur in mantle-derived xenoliths. The approach is designed to provide an integrative data set to constrain how elements abundant in Earth's atmosphere and hydrosphere are cycled into, retained within, and degassed from Earth's deep interior.