Geochemical Indicators in the Hydrothermal Fluids for Exploration of Overprinting Orebodies

在菲律宾进行了实地工作，收集了斑岩和浅热液矿体的样品。已经准备了岩石样品的薄和厚切片，用于岩石学、流体包裹体研究和电子探针显微分析。利用该项目研制了一种新的光学显微镜，用于岩石学观察。利用电子探针微量分析仪（EPMA）测定了该浅成热液矿体中主要矿物辉石矿的矿物化学特征。在合作者的贡献下，还分析了石英和铝辉石中流体包裹体的总体化学成分。利用红外照相机成功地观察到了铝辉石的内部结构。在红外光观测下，流体包裹体的相变也得到了成功的记录，尽管收集了一些关于含辉石矿流体包裹体均一温度和盐度的数据。目前正在总结对辉石矿矿物化学、流体包裹体化学与形成温度之间关系的观察。会议报告的摘要已经提交，目前正在准备一份关于矿体的手稿。

Fieldwork has been carried out in the Philippines to collect samples of porphyry and epithermal orebodies. Thin and thick sections of rock samples have been prepared for petrographic, fluid inclusions studies and electron probe microanalysis. A new optical microscope has been procured using this project and was used for petrographic observations. Mineral chemistry of enargite, the main ore mineral in the epithermal orebody, has been determined using the electron probe microanalyzer (EPMA). Bulk chemical composition of fluid inclusions in quartz and enargite has also been analyzed with the contribution of the collaborators. The internal structure of enargite have been successfully observed using an infrared camera. Phase transitions of fluid inclusions under infrared light observation have also been successfully documented, although a few data on the homogenization temperature and salinity of enargite-hosted fluid inclusions have been gathered. Observations on the relationships between the mineral chemistry of enargite, the chemistry of fluid inclusions and temperatures of formation are currently being summarized. Abstracts for conference presentations have been submitted and a manuscript about an orebody is currently being prepared.