Kinetics of Dissolution and Crystal Growth of Silicates and Aluminosilicates in Aqueous Solutions at Low Temperatures

低温水溶液中硅酸盐和铝硅酸盐的溶解和晶体生长动力学

• 批准号: 9017976
• 负责人: Antonio Lasaga
• 金额: $ 17.63万
• 依托单位: Yale University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-01-01 至 1993-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9017976&HistoricalAwards=false
• 关键词: Kinetics; Dissolution; Crystal; Growth; Silicates

This is a continued study of the experimental determination of the dissolution and precipitation kinetics of silicates and aluminosilicates as functions of pH, temperature and the Gibbs Free Energy of reaction ( G); to examine the surfaces of the reacted minerals using surface analytical techniques (e.g. XPS, AES, STM, AFM) which when combined with rates determined from solution chemistry using flow-through reactors will provide information on surface reaction mechanisms; and to apply the rate data obtained to model low temperature, predominantly meteoric water diagenesis of a Jurassic feldspathic sandstone in the North Sea. Our experimental work is the first to describe both dissolution and precipitation rates of major rock-forming silicates and aluminosilicates as a function of G, as well as the first to measure precipitation rates in phases more complex than quartz. Incorporation of the full rate laws in an accurate two-dimensional hydrodynamic model of fluid flow in porous media should result in the first completely quantitative physical and chemical explanation of diagenesis in a dynamic sedimentary basin.

这是对硅酸盐和铝硅酸盐溶解和沉淀动力学随pH、温度和吉布斯反应自由能(G)的变化的实验测定的继续研究；使用表面分析技术(如XPS、AES、STM、AFM)检查反应矿物的表面，这些分析技术与使用流动反应堆的溶液化学测定的速率相结合，将提供关于表面反应机理的信息；并将获得的速率数据用于模拟北海侏罗纪长石砂岩的低温、主要是大气降水成岩作用。我们的实验工作首次描述了主要成岩硅酸盐和铝硅酸盐的溶解和沉淀速率作为G的函数，以及第一次测量了比石英更复杂的相的沉淀速率。将全速率定律结合到流体在多孔介质中流动的准确的二维流体动力学模型中，应该会首次对动态沉积盆地中的成岩作用做出完全定量的物理化学解释。