Ore-Forming Processes in Hydrothermal Systems: A Study Utilizing the SHRIMP Ion Microprobe

该项目旨在利用活动地热系统的新钻芯和流体样品以及古浅成热液金矿床，将S同位素系统学的研究扩展到其他大陆热液系统。PI将研究硫化物矿物硫同位素分区的一般系统学，以响应成矿环境中沸腾和其他形式的流体不混溶。拟议的对贵金属沉积的平行影响的普遍性也将在几个地点进行测试。除了Valles Caldera，加利福尼亚州的间歇泉和Coso地热田提供了两个活跃的环境，在那里发生了沸腾和贵金属沉积。此外，加利福尼亚州的麦克劳克林和仙人掌皇后金矿提供了两个化石浅成热液系统，在成矿过程中可能存在类似的系统。

This project is to extend studies of S isotope systematics to other continental hydrothermal systems, making use of new drillcores and fluid samples from active geothermal systems as well as fossil epithermal gold deposits. The PI will examine the general systematics of sulfur isotopic zoning of sulfide minerals in response to boiling and other forms of fluid immiscibility in ore-forming environments. The generality of the proposed parallel effects on precious metals deposition will also be tested at several localaties. In addition to the Valles Caldera, the Geysers and Coso geothermal fields in California offer two active settings where boiling and precious metals deposition occur. Additionally, the McLaughlin and Cactus Queen gold deposits in California offer two fossil epithermal systems where similar systematics may have existed during ore genesis.