Partitioning of F, Cl, the Alkalis and Alkaline Earths in Hydrothermal Ore-Forming Systems

该项目将继续研究微量元素在矿物和热液流体之间的分配。热液如何获得微量元素并成为成矿流体？研究人员最近开发了氟和氯分配的热力学基础，首次能够使用云母和磷灰石的化学分析来限制热液流体的pH值、氟和氯的含量和形态。他们希望扩大应用范围：(1)评价热水沉积盆地和地热流体的PHS：(2)研究密西西比河谷型矿床中氟的富集源；(3)利用已发表的实验研究成果，对Li、Rb、Cs、Sr、Ba在云母、长石和热液流体之间分配的热力学计算进行了标定，从而将配分研究扩展到包括微量碱和碱土。这一结果可能会对我们理解热液成矿产生重大影响。

This project is to continue the study of partitioning of trace elements between minerals and hydrothermal fluids. How do hydrothermal fluids acquire trace elements and become ore-forming fluids? The investigators have recently developed a thermodynamic basis for the partitioning of F and Cl that enables, for the first time, chemical analyses of micas and apatites to be used to place constraints on the pH and the F and Cl contents and speciation of hydrothermal fluids. They expect to expand the applications to (1) Evaluate the pHs of hydrothermal sedimentary basinal and geothermal fluids; (2) study the origins of F enrichment in Mississippi Valley-type ore deposits; and (3) extend the study of partitioning to include the trace alkalis and alkaline earths, by using published experimental studies to calibrate thermodynamic calculations of partitioning of Li, Rb, Cs, Sr, and Ba between micas, feldspars and hydrothermal fluids. The results could have a significant impact upon our understanding of ores develop from hydrothermal solutions.