Geochemical Evolution and Mineralization of Felsic Liquids: The Function and Behavior of Volatiles, Fluxing Components, and Ore Metals During Late-Stage...

长英质液体的地球化学演化和矿化：后期阶段挥发物、熔剂成分和矿石金属的功能和行为...

• 批准号: 9725072
• 负责人: James Webster
• 金额: $ 12.69万
• 依托单位: American Museum Natural History
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-01-15 至 2002-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9725072&HistoricalAwards=false
• 关键词: Geochemical; Evolution; Mineralization; Felsic; Liquids

9725072 Webster The proposed study will determine compositions of granitic, pegmatitic, and aplitic liquids that generated tin and tungsten mineralization in the historic Erzgebirge mountains of southern Germany and will investigate the evolution of granitic to pegmatitic and aplitic liquids by analyzing silicate melt inclusions in rocks from several mineralized systems in this mining district. Particular attention will be directed at the behavior of the volatiles water, fluorine, chlorine, phosphorus, and boron, because these constituents exert strong controls on magmatic processes and concomitant processes of hydrothermal alteration and ore formation. Another goals of the study will be to determine the abundances of the ore metals tin and tungsten in the silicate melt inclusions. The melt inclusions will be analyed by electron and ion microprobes and infrared spectroscopy. The behavior of tin in mineralizing, magmatic systems will be investigated through experimental study of the dissolution of cassiterite (the chief ore mineral of tin) in granitic liquids that are variably enriched in fluorine, water, and phosphorus. The results of these investigations are important for understanding how granitic liquids evolve, form pegmatite and aplite facies, and generate tin and tungsten ore deposits.

9725072韦伯斯特拟议的研究将确定在德国南部历史悠久的埃尔兹伯里山脉产生锡和钨矿化的花岗岩、伟晶岩和辉长岩流体的组成，并将通过分析该矿区几个成矿系统岩石中的硅酸盐熔体包裹体来研究花岗岩向伟晶岩和辉长岩流体的演化。将特别关注挥发物水、氟、氯、磷和硼的行为，因为这些成分对岩浆过程以及伴随的热液蚀变和成矿过程起着强有力的控制作用。这项研究的另一个目标是确定硅酸盐熔体包裹体中矿石金属锡和钨的丰度。熔体包裹体将用电子、离子探针和红外光谱进行分析。通过锡石(锡的主要矿石矿物)在富氟、富水、富磷的花岗岩液体中溶解的实验研究，研究锡在成矿、岩浆系统中的行为。这些研究结果对于了解花岗岩流体如何演化、形成伟晶岩相和辉长岩相，以及如何形成锡和钨矿床具有重要意义。