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Fluid inclusion study in the Huanuni mine, Bolivia.

1989; Volume: 105; Issue: 14 Linguagem: Inglês

10.2473/shigentosozai.105.1073

1880-6244

Osvaldo Arce, M. Nambu,

Minerals Flotation and Separation Techniques

A study on fluid inclusions in quartz and cassiterite from the Huanuni mine in the western part of Bolivia was carried out.Secondary inclusions along a healed crak show a wide range of filling temperatures but a narrow range of salinities. This would suggest that inclusions were trapped from similar solution in different gas/liquid ratios, due mainly to boiling of the ore forming fluid.The mode of occurrence of the fluid inclusions indicate that the fluid boiled frequentely at all stages of mineral deposition. Since the lowest filling temperature of those inclusions would be close to the trapping temperature, we conclude that the forming temperatures in the early and late vein stages were about 350°and 100°, respectively.The boiling under conditions of super saturation, also would cause the profuse deposition of fine grain minerals at Huanuni mine.