The Geochemical Consequences of Fluid Immiscibility on Ore Deposition (Earth Science)

流体不混溶性对矿石沉积的地球化学影响（地球科学）

• 批准号: 8800108
• 负责人: Teresa Bowers
• 金额: $ 8.77万
• 依托单位: Harvard University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1988
• 资助国家: 美国
• 起止时间: 1988-07-01 至 1989-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8800108&HistoricalAwards=false
• 关键词: Geochemical; Consequences; Fluid; Immiscibility; Ore

Fluid inclusion evidence exists in a number of economic ore deposits suggesting a link between the onset of fluid immiscibility and initiation of ore deposition. The effects of fluid immiscibility on mineral equilibria and ore deposition can be assessed by incorporation of a modified Redlich-Kwong activity model for H2O and CO2 from Bowers and Helgeson (1983) into the EQ3/6 chemical equilibria and mass transfer computer code (Wolery, 1978, 1979, 1983). This model will account for loss of components from the system and the effects of two-phase separation on pH and chemical speciation of the fluid, as well as mineral stabilities and deposition. In addition, stable isotope partitioning between liquid and vapor phases and simultaneously forming mineral phases will be considered. Preliminary calculations for a fluid intersecting the H2O - CO2 miscibility gap by a drop in pressure at 250oC are presented. The model predicts the expected rise in pH upon CO2 loss from the system as well as deposition of carbonate minerals. One of the paths results in deposition of substantial amounts of metal sulfides at the onset of fluid immiscibility. Dr. Bowers will teach a course entitled Thermodynamics of Geologic Processes, present a series of graduate lectures on various aspects of her work, and bring to Harvard complete computer capabilities for geochemical modeling appropriate to the course and for further student use on their own research projects. This project furthers VPW program objectives which are (1) to provide opportunities for women to advance their careers in engineering and in the disciplines of science supported by NSF and (2) to encourage women to pursue careers in science and engineering by providing greater visibility for women scientists and engineers employed in industry, government, and academic institutions. By encouraging the participation of women in science, it is a valuable investment in the Nation's future scientific vitality.

一些经济矿石中存在流体包裹体证据 这些沉积物表明液体的出现 不相容性和成矿作用的启动。 的影响 流体对矿物平衡和矿床的不渗透性， 通过纳入经修改的Redlich-Kwong活动进行评估 Bowers和Helgeson（1983年）的H2O和CO2模型 EQ 3/6化学平衡和传质计算机程序 （Wolery，1978，1979，1983）。 该模型将考虑 系统的组成和两相的影响 根据流体的pH值和化学形态进行分离，以及 矿物稳定性和沉积作用。 此外，稳定同位素 液相和气相之间的分配，同时 将考虑形成矿物相。 初步 与H_2 O-CO_2渗透率相交的流体的计算 间隙的压力下降，在250 ℃。 模型 预测系统中CO2损失后pH值的预期升高， 以及碳酸盐矿物的沉积。 路径之一 导致大量金属硫化物的沉积， 开始出现体液不能吸收。 鲍尔斯博士将教授一门名为“热力学”的课程。 地质过程，提出了一系列的研究生讲座， 她的工作的各个方面，并使哈佛完成 计算机能力的地球化学建模适当的 课程和进一步的学生使用自己的研究 项目 本项目进一步促进了VPW计划的目标，即（1） 为妇女提供机会， 工程和科学的学科由NSF支持 （2）鼓励妇女从事科学事业， 通过提高女科学家的知名度， 以及受雇于工业、政府和学术界的工程师 机构职能体系 通过鼓励妇女参与 这是对国家未来的宝贵投资。 科学生命力。