Boron Isotopic Studies of Hydrothermal Fluids and AssociatedVein Mineralization

热液和伴生脉矿化的硼同位素研究

• 批准号: 9015619
• 负责人: William Leeman
• 金额: --
• 依托单位: William Marsh Rice University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-07-01 至 1991-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9015619&HistoricalAwards=false
• 关键词: Boron; Isotopic; Studies; Hydrothermal; Fluids

The purpose of this SGER award is to initiate a collaborative investigation of B isotopic fractionation between well characterized samples of hydrothermal brines and associated vein mineralization at the Salton Sea, Coso, and Geysers geothermal fields. This study will serve to evaluate both B elemental and isotopic partitioning between several common alteration minerals and the fluids from which they precipitated. Empirical calibration of temperature effects on such partitioning is also possible using reservoir characteristics established for commercial geothermal wells in these fields. Essentially, it is planned to use the natural systems as a form of experimental calibration. This approach will provide an important survey of B concentrations in a variety of hydrothermal minerals(and of the feasibility of B isotopic analysis in each) that will focus subsequent detailed experimentation on those mineral species having the greatest potential for practical applications. Isotopic measurements will be carried out at the National Institute for Standards and Technology in collaboration with R. Vocke whose research group has recently developed an improved method for B isotopic mass spectrometry. It is proposed to first analyze selected fluid samples previously collected by M.A. McKibben to refine methods for isotopic analysis, then to visit representative wells from each of the geothermal fields for further sampling of fluids and vein mineralization (from core and cuttings).

该SGER奖的目的是对萨尔顿海，COSO和间歇泉地热场的水热盐水和相关静脉矿化样品的B同位素分馏进行合作研究。 这项研究将用于评估几种常见改变矿物质与它们沉淀的流体之间的B元素和同位素分配。 使用针对这些领域的商业地热井建立的储层特性，还可以对温度对这种分配的影响进行经验校准。 本质上，计划将天然系统用作实验校准的一种形式。 这种方法将对各种热液矿物质（以及每种B同位素分析的可行性）的B浓度进行重要的调查，这些调查将集中在随后的详细实验上，这些实验对那些具有最大实用应用潜力的矿物质物种。 同位素测量将在美国国家标准技术研究所与R. Vocke合作进行，其研究小组最近为B同位素质谱法开发了一种改进的方法。 提议首先分析先前由M.A. McKibben收集的选定的流体样品，以优化同位素分析的方法，然后参观来自每个地热场的代表性井，以进一步对流体和静脉矿化进行进一步采样（来自核心和切口）。