Metamorphic equilibria in the siliceous dolomite system: 6 kbar experimental data and geologic implications

Details Metamorphic equilibria in the siliceous dolomite system: 6 kbar experimental data and geologic implications Metamorphic equilibria in the siliceous dolomite system: 6 kbar experimental data and geologic implications

Jul 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981gecoa..45.1039e&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 45, Issue 7, pp.1039-1049

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7

Scientific paper

Hydrothermal experiments with H 2 O-CO 2 fluids at P fluid = 6 kbar yielded the following quilibrium conditions for reactions important in metamorphosed siliceous dolomites ( T = ° C ; X = X co 2 ): (3) dolomite + 2 quartz = diopside + 2 CO 2 T = 620 ± 8 X = 0.73 ± 0.03 (5) 5 dolomite + 8 quartz + H 2 O = tremolite + 3 calcite + 7 CO 2 T = 600 ± 5 550 ±5 540±5 500±5 X = 0.66 ± 0.03 0.21 ± 0.03 0.21 ± 0.04 0.06 ± 0.02 (7) 3 dolomite + 4 quartz + H 2 O = talc + 3 calcite + 3 CO 2 T = 550±5 500±5 450 ±5 X = 0.25 ± 0.05 0.07 ± 0.02 0.03 ± 0.02 (8) 2 dolomite + talc + 4 quartz = tremolite + 4 CO 2 T = 550 ± 5 540 ±5 500 ± 5 X = 0.22 ± 0.03 0.21 ± 0.02 0.06 ± 0.02 A thermodynamically self-consistent 6 kbar T - X CO 2 , topology results by extrapolating equilibria from experimental brackets using a modified Redlich-Kwong equation for activities in H 2 O-CO 2 mixtures. This topology restricts the assemblage talc + calcite to a narrow stability band in T - X CO 2 space at X CO 2 < 0.55 and T < 590° C . Accordingly, the occurrence of talc + calcite in pure siliceous dolomites metamorphosed at P fluid = 6 kbar implies correspondingly water-rich fluids.

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