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

高压高温弹性及水相状态方程

• 批准号: 1639552
• 负责人: Mainak Mookherjee
• 金额: $ 9.68万
• 依托单位: Florida State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2016
• 资助国家: 美国
• 起止时间: 2016-01-01 至 2017-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1639552&HistoricalAwards=false
• 关键词: pressure; Temperature; Elasticity; Equation; State

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.

通过岩石圈和上覆水圈之间的持续相互作用，洋壳中的水合相得以稳定。这些含水相锁住了大量的水，并在地质时间尺度上对影响全球海平面起着重要作用。俯冲带是主要的构造特征，将水输送到地球内部。水的输导效率和地幔水化程度与水合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、弹性和输运性质有相当大的影响，因此限制地幔水化程度是很重要的。本研究试图对水进入地球内部和对地幔水化施加更精确的限制。这将有助于对俯冲带环境中可能稳定的各种水合相的晶体结构、热力学、状态方程和弹性的科学理解。它将把含水相的能量学和热弹性与以下方面联系起来：水进入地球内部的输送；地幔水化的程度；观测到的低速层；以及俯冲带环境中的大各向异性。这项研究将采用独特的实验和理论相结合的方法。