Constraints on Mantle Fluids and Hydrous Phases from High Pressure Diamond Anvil Cell Experiments

高压金刚石砧室实验对地幔流体和水相的限制

• 批准号: 0711315
• 负责人: Quentin Williams
• 金额: $ 27.82万
• 依托单位: University of California-Santa Cruz
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-07-01 至 2011-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0711315&HistoricalAwards=false
• 关键词: Constraints; Mantle; Fluids; Hydrous; Phases

This project has a research plan to examine the structure and speciation of a variety of impure aqueous fluids using a combination of spectroscopic techniques (particularly infrared spectroscopy) at high pressures and temperatures. Initial studies by the team will focus on halide- and carbonate-bearing water-rich systems to pressures near 10 GPa and temperatures of 600°C. These conditions are compatible with those associated with the slab-mantle interface within the planet, and thus with the dehydration of subducted oceanic crust and sediments. Such fluids are thus representative of the fluids that ultimately generate the initiation of hydrous melting associated with arc volcanism. The main scientific goals are to characterize the structural changes taking place within the water itself as a consequence of both impurities and high pressures and temperatures - changes that have been associated with marked shifts in the chemical behavior of aqueous solutions at high pressures - and to, where feasible, characterize the local bonding environment of the impurity itself. These studies hold the prospect for illuminating one of the most poorly understand features of the subduction process: the behavior of the fluids that ultimately give rise to subduction-related magmatism around the planet.

该项目具有研究计划，可在高压和温度下使用光谱技术（部分红外光谱）的组合来检查各种不纯净的水性流体的结构和规格。团队的初步研究将集中于卤化物和碳酸盐水的系统，以在10 GPA接近的压力和600°C的温度附近。这些条件与与行星内的板膜螺栓界面相关的条件兼容，因此笛子代表了最终产生与弧火山相关的含水熔化的流体。主要的科学目标是表征由于杂质，高压力和温度的结果，水域本身发生的结构变化 - 与高压水性溶液的化学行为显着转移有关的变化 - 可行的，可行的是，在不可行的情况下，特征是杂质本身的局部粘结环境。这些研究的前景是阐明俯冲过程中最糟糕的理解特征之一：最终导致地球周围俯冲相关的磁岩的行为。