Experimental Study of Water at Deep Mantle Conditions

地幔深部条件下水的实验研究

• 批准号: 0001087
• 负责人: Raymond Jeanloz
• 金额: $ 17.98万
• 依托单位: University of California-Berkeley
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-06-15 至 2003-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0001087&HistoricalAwards=false
• 关键词: Experimental; Study; Water; Deep; Mantle

Jeanloz 0001087 Understanding the properties of H2O deep inside the Earth has major implications for deciphering the geochemical cycling of water and the possible initiation of melting inside the planet, as well as the geophysically observed properties of the mantle. Thermodynamic analysis even suggests that ice may be present at depth, subducted within cold rapidly-sinking slabs. The proposal requests support for a 2-year experimental effort intended to document 1) the crystal-structural identity, 2) thermal equation of state and 3) melting temperature of crystalline H2O (Ice VII, and potentially other polymorphs) at high pressures and temperatures, providing fundamental constraints on the stability and the geophysically relevant properties (elasticity, density) of H2O phases at lower-mantle pressures, ~20-80 GPa.

Jeanloz 0001087了解地球深处H2O的性质对于破译地球内部水的地球化学循环和可能的熔融起始以及地幔的地球化学观测性质具有重要意义。热力学分析甚至表明，冰可能存在于深处，俯冲在快速下沉的冷板中。该提案要求支持一项为期2年的实验工作，旨在记录1）晶体结构特性，2）状态热方程和3）结晶H2O的熔化温度（冰VII，和潜在的其他多晶型物）在高压和高温下，提供了对稳定性和化学相关性质的基本约束（弹性，密度）的H2O相在下地幔压力，~20-80 GPa。