The Use of U/Th Decay Series Radioisotopes to Estimate Rates of Water-Rock Exchange in the Coso Geothermal System

使用 U/Th 衰变系列放射性同位素估算科索地热系统中水-岩石交换率

• 批准号: 8804735
• 负责人: Douglas Hammond
• 金额: $ 9.35万
• 依托单位: University of Southern California
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1988
• 资助国家: 美国
• 起止时间: 1988-08-01 至 1991-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8804735&HistoricalAwards=false
• 关键词: Use; Th; Decay; Series; Radioisotopes

The PI's propose measuring U and Th decay series radionuclides in geothermal brines and their associated solid phases obtained from commercial geothermal wells in the Coso Geothermal Field. Past work in the Salton Sea geothermal field demonstrate that radioactive disequilibria between brines and solid phases can be used to determine (1) behavior of actinides and their daughters in high temperature waters; (2) rates of brine-rock interaction, and (3) hydrogeologic parameters. A crystalline plutonic/metamorphic basement below Coso provides a different environment (from Salton Sea; sedimentary basement) to contrast the effects of different host rocks on fluid evolution.

PI建议测量从Coso地热田的商业地热井获得的地热盐水及其相关固相中的U和Th衰变系列放射性核素。过去在索尔顿海地热田的工作表明，盐水和固相之间的放射性不平衡可以用来确定(1)锕系元素及其子元素在高温水中的行为；(2)盐岩相互作用速率；(3)水文地质参数。Coso下方的结晶深成/变质基底提供了一个不同的环境（从索尔顿海；沉积基底）来对比不同的宿主岩石对流体演化的影响。