Experimental and Theoretical Studies of Deep Fluids

深层流体的实验和理论研究

• 批准号: 9909583
• 负责人: Craig Manning
• 金额: $ 21.02万
• 依托单位: University of California-Los Angeles
• 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: 2000-01-01 至 2004-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9909583&HistoricalAwards=false
• 关键词: Experimental; Theoretical; Studies; Deep; Fluids

EAR-9909583ManningThe liberation and movement of aqueous fluids is important in many high-pressure geologic processes. For example, aqueous solutions are produced during deep-crustal metamorphism, and their migration redistributes geologically important elements in the crust. Similarly, in the mantle, the source regions for diverse magma types show signs of the passage of water-bearing fluids. The transport of substantial quantities of matter arises from the increasing solubilities of most minerals in water-rich solutions with increasing pressure. However, despite abundant evidence that these processes occur in the Earth, systematic study remains limited because the properties of the solutes dissolved in the fluid are poorly known at high pressure.This project involves experimental and theoretical investigations of the chemistry of aqueous fluids and their dissolved constituents at high pressures (5 kb). The approach is to use recent advances in prediction of the thermodynamic properties of aqueous species in deep fluids to compute model phase relations in the presence of fluid in different environments. The predictions are then used to guide experimental studies on solubilities of major rock-forming minerals. In addition, we are determining solubilities of selected trace-element oxides to identify elements that should readily be redistributed during high-pressure fluid flow. Finally, we are studying the effect of Cl and CO2 on fluid transport in deep environments by measuring mineral solubility in aqueous solutions containing these components. When completed, the combined theoretical and experimental studies will provide a quantitative framework for studying the physical and chemical aspects of fluid flow in deep geologic environments.

含水流体的释放和运动在许多高压地质作用中是重要的。例如，水溶液是在地壳深部变质作用期间产生的，其迁移使地壳中具有地质重要性的元素重新分布。同样，在地幔中，不同岩浆类型的源区显示出含水流体通过的迹象。随着压力的增加，大多数矿物质在富水溶液中的溶解度增加，从而导致大量物质的迁移。然而，尽管有大量的证据表明，这些过程发生在地球上，系统的研究仍然有限，因为溶解在流体中的溶质在高压下的属性知之甚少。本项目涉及高压下含水流体及其溶解成分的化学实验和理论研究（5 kb）。该方法是使用最近的进展，在深部流体中的水相物质的热力学性质的预测计算模型中的流体在不同的环境中的相关系。预测，然后用于指导实验研究的主要造岩矿物的溶解度。此外，我们正在确定选定的微量元素氧化物的溶解度，以确定在高压流体流动过程中应容易重新分布的元素。最后，我们正在研究Cl和CO2对深部环境中流体输送的影响，通过测量含有这些成分的水溶液中的矿物溶解度。一旦完成，理论和实验相结合的研究将为研究深部地质环境中流体流动的物理和化学方面提供一个定量框架。