Mixing of H 2 O-CO 2 in fluid inclusions; geobarometry and Archean gold deposits

Details Mixing of H 2 O-CO 2 in fluid inclusions; geobarometry and Archean gold deposits Mixing of H 2 O-CO 2 in fluid inclusions; geobarometry and Archean gold deposits

May 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986gecoa..50..847b&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 50, Issue 5, pp.847-852

Physics

10

Scientific paper

A modified Redlich-Kwong (MRK) equation of state for H 2 O and CO 2 was used to calculate bulk molar volumes, mole fractions and CO 2 densities for mixed volatile fluid inclusions. The results allow very useful P-T diagrams to be constructed (for fixed CO 2 density) and contoured with volume percent CO 2 observed in the laboratory. These diagrams permit rapid qualitative or quantitative determination of the P-T path for a bulk inclusion isochore above the solvus in the system H 2 O-CO 2 (±NaCl). The calculations suggest peak metamorphic pressures of 3-5 kb for some Archean greenstone gold deposits. Insights gained from this work may require reinterpretation of pressure estimates in published fluid inclusion studies.

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