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厄尔士山脉中产生锡和钨矿化的花岗岩、伟晶岩和细化液体的成分，并将通过分析岩石中的硅酸盐熔体包裹体来研究花岗岩到伟晶岩和细化液体的演化。该矿区有几个矿化系统。 我们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矿石形成过程发挥着强有力的控制作用。 该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。 熔体夹杂物将通过电子和离子微探针以及红外光谱进行分析。 通过实验研究锡石（锡的主要矿石矿物）在富含氟、水和磷的花岗岩液体中的溶解情况，研究锡在矿化、岩浆系统中的行为。 这些研究的结果对于了解花岗岩液体如何演化、形成伟晶岩和细晶岩相以及生成锡和钨矿床非常重要。