High-pressure and Temperature Elasticity and Equation of State of Hydrous Phase

海洋地壳中的含水相是通过岩石圈和上覆水圈之间的不断相互作用而稳定下来的。这些含水相锁定了大量的水，在地质时间尺度上，在影响全球海平面方面发挥着重要作用。作为主要构造特征的俯冲带将水输送到地球内部。水的传输效率和地幔水化程度与含水相的热力学稳定性和热弹性密切相关。由于水对固体地球的熔融、弹性和输运性质有着重要的影响，因此对地幔水化程度的限制就显得尤为重要，本研究试图对水向地球内部的输运和地幔水化提出更精确的限制。它将有助于科学地理解可能在俯冲带环境中稳定的各种含水相的晶体结构、热力学、状态方程和弹性。它将涉及能量学和热弹性的含水相以下方面：运输到地球内部的水;地幔水化的程度;观察到的低速层;和大的各向异性在俯冲带设置。该研究将通过使用实验和理论方法的独特组合进行。

Hydrous phases are stabilized in the oceanic crust through constant interaction between the lithosphere and the overlying hydrosphere. These hydrous phases lock up substantial amounts of water and, over geological time scale, play a significant role in influencing the global sea-level. Subduction zones, which are major tectonic features, transport water into the Earth's interior. The efficiency of the transport of water and the extent of mantle hydration are intimately linked with the thermodynamic stability and thermoelasticity of hydrous phases. Since water has considerable effects on melting and on the elastic and transport properties of the Solid Earth, it is important to constrain the degree of mantle hydration.This research attempts to put more accurate constraints on the transport of water into the Earth's interior and on mantle hydration. It will contribute to scientific understanding of the crystal structure, thermodynamics, equation of state, and elasticity of various hydrous phases that are likely to be stabilized in subduction zone settings. It will relate the energetics and thermoelasticity of hydrous phases with the following aspects: transport of water into the Earth's interior; extent of mantle hydration; observed low velocity layers; and large anisotropy in subduction zone settings. The research will be conducted by using a unique combination of experimental and theoretical methods.