Geochemical Indicators in the Hydrothermal Fluids for Exploration of Overprinting Orebodies

菲律宾已经开展了野外工作，以收集斑岩和浅成热液矿体的样本。已制备了岩石样品的薄片和厚片，用于岩相学、流体包裹体研究和电子探针显微分析。利用这一项目已经购置了一台新的光学显微镜，并用于岩相学观察。利用电子探针对低温热液矿体中的主要矿石矿物--辉绿岩的矿物化学进行了测定。在合作者的贡献下，还分析了石英和辉绿岩中流体包裹体的整体化学成分。用红外相机成功地观察到了辉绿岩的内部结构。红外光观测下流体包裹体的相变也被成功地记录下来，尽管收集了一些关于榴辉岩中流体包裹体的均一温度和盐度的数据。关于辉绿岩矿物化学、流体包裹体化学和形成温度之间的关系的观察目前正在总结中。会议报告的摘要已经提交，目前正在编写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.