Isotope Ratio and Trace Elemental Imaging of Minerals by Secondary Ion Mass Spectometry

通过二次离子质谱法对矿物进行同位素比和痕量元素成像

• 批准号: 9160939
• 负责人: Ronald Fleming
• 金额: $ 5万
• 依托单位: Charles Evans & Associates
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-01-15 至 1992-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9160939&HistoricalAwards=false
• 关键词: Isotope; Ratio; Trace; Elemental; Imaging

This is a proposal to develop secondary ion mass spectrometry (SIMS) based imaging isotope ratio techniques for isotopic microanalysis of mineral deposits. This capability will be combined with SIMS based trace element microanalysis. The petrogenesis of ore deposits often involves an aqueous solution by which the ore-bearing components are transported. These hydrothermal solutions also transport sulfur. Different aqueous processes give rise to different 34S/32S isotope fractionations. The 34S/32S ratios can provide important indications of the sulfur origin, and by extension, the origin of economically important metals. Isotope ratio and trace element imaging show the interrelationships of different mineral generations. These generations often coexist within a single mineral grain. The PIs have demonstrated that imaging SIMS can successfully identify the location of trace gold levels ("invisible" gold) in pyrite rims, and that isotope ratio imaging of meteoritic materials highly enriched in deuterium is possible. However, extension to 34S/32S isotope ratio imaging requires further innovation and many careful measurements. In Phase II, these imaging techniques will be extended to microanalytical age dating and microanalytical trace element petrogenesis.

这是一个发展二次离子质谱的建议 基于西姆斯的同位素成像技术 矿床的微观分析 这种能力将是 结合基于西姆斯的微量元素分析。 的 矿床的岩石成因通常涉及水溶液， 其中含矿组分被运输。 这些 热液溶液也输送硫。 不同水性 过程产生不同的34 S/32 S同位素分馏。 34 S/32 S比值可以提供硫的重要指示 起源，并通过扩展，经济上重要的起源 金属. 同位素比值和微量元素成像显示 不同矿物世代的相互关系。 这些 几代人往往共存于一个单一的矿物颗粒。 法律与正义党 已经证明，成像西姆斯可以成功地识别 黄铁矿边缘中痕量金水平（“不可见”金）的位置， 陨石物质的同位素比成像 富含氘是可能的。 然而，延伸至34 S/32 S 同位素比成像需要进一步的创新和许多仔细的 测量. 在第二阶段，这些成像技术将 扩展到微量分析年龄测定和微量分析痕量 元素成因