Mineral Dissolution and Precipitation Rates Under Near Equilibrium Conditions: An Application of Isotopic Doping Techniques to the CaO-MgO-SiO2-H2O System

近平衡条件下的矿物溶解和沉淀速率：同位素掺杂技术在 CaO-MgO-SiO2-H2O 体系中的应用

• 批准号: 9418719
• 负责人: William Seyfried
• 金额: $ 13.5万
• 依托单位: University of Minnesota-Twin Cities
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1995
• 资助国家: 美国
• 起止时间: 1995-02-01 至 1998-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9418719&HistoricalAwards=false
• 关键词: Mineral; Dissolution; Precipitation; Rates; Under

9418719 Seyfried This research will utilize a newly developed method to measure near equilibrium dissolution and precipitation rates of minerals in the CaO-MgO-SiO2-H2O system at temperatures from 100-400 oC and pressures up to 1 kbar. The method involves measuring rates of crystal growth and dissolution during reaction of fluids with metastable reactant and stable product minerals. The technique to be used involves monitoring reaction progress continuously during experiments by means of isotopic tracers. Metastable steady state conditions and adjustments of the relative states of saturation with respect to mineral phases can be established by systematically changing the relative surface areas of "reactant" and "product". Results of the experiments will provide near-equilibrium rate data for geochemically important minerals at a wide range of temperatures and pressures. These data can be included in reaction path codes such as EQ6, which will allow construction of better models for the chemical evolution of fluids in active hydrothermal systems.

小行星9418719 这项研究将利用一种新开发的方法来测量温度从100 - 400 ℃和压力高达1千巴的CaO-MgO-SiO2-H2O系统中矿物的近平衡溶解和沉淀速率。 该方法涉及测量晶体生长和溶解的速率在流体与亚稳反应物和稳定的产物矿物的反应。 所使用的技术包括在实验过程中通过同位素示踪剂连续监测反应进程。 相对于矿物相的亚稳稳态条件和相对饱和状态的调节可以通过系统地改变"反应物"和"产物"的相对表面积来建立。 实验结果将提供地球化学上重要矿物在各种温度和压力下的近平衡速率数据。 这些数据可以包括在反应路径代码，如EQ6，这将允许建设更好的模型，在活跃的热液系统中的流体的化学演化。