Magmatic and Hydrothermal Processes in Porphyry Copper Deposits Below 3km Depth

9418931迪尔斯斑岩铜矿化的成因广泛地与上地壳花岗岩岩浆房结晶过程中演化的岩浆热液有关。这项研究将提供斑岩铜花岗岩的关键地球化学数据，这些花岗岩暴露在1至6公里深的横截面上(例如内华达州的耶灵顿地区)。这些数据将为花岗岩结晶的当前理论和实验模型提供现场实验室测试，以及沉淀矿石的高盐度、富铜和富硫流体的演化。研究将重点分析花岗岩黑云母、磁铁矿、角闪石和硫化物(黄铁矿、黄铜矿)中的铜、硫、锌和铜的含量。分析将由电子微探针和离子微探针完成，允许将含量量化到百万分之一的水平。然后，可以利用微量元素的行为来估计花岗岩在结晶过程中达到水饱和并失去铜和硫的深度和时间。同位素和成分数据将使非岩浆流体作为矿石组分来源的重要性得以量化。

9418931 Dilles The origin of porphyry copper mineralization has been broadly related to magmatic hydrothermal fluids that evolve during crystallization of upper crustal, granitic magma chambers. The research will provide critical geochemical data from porphyry copper granites that are exposed in cross- section from 1 to 6 km depth (e.g. the Yerington district, Nevada). The data will provide a field laboratory test of the current theoretical and experimental models of granite crystallization and evolution of highly saline, copper- and sulfur-rich fluids that precipitated ores. The research will emphasize analysis of copper, sulfur, zinc, and copper contents of granite biotite, magnetite, hornblende, and sulfides (pyrite, chalcopyrite). Analyses will be done by electron microprobe and ion microprobe, allowing quantification of contents to the one part-per-million level. The behavior of the trace elements can then be used to estimate at what depths and when during crystallization that granites reached water saturation and lose copper and sulfur. The isotopic and compositional data will allow quantification of the importance of the non-magmatic fluids as source of ore components.