Geochemical Indicators in the Hydrothermal Fluids for Exploration of Overprinting Orebodies

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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.