Dolomite-calcite equilibrium at 220 to 240 °C at saturation vapour pressure: Experimental data

Details Dolomite-calcite equilibrium at 220 to 240 °C at saturation vapour pressure: Experimental data Dolomite-calcite equilibrium at 220 to 240 °C at saturation vapour pressure: Experimental data

Jan 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994gecoa..58..169m&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 58, Issue 1, pp.169-177

Computer Science

1

Scientific paper

Small amounts of dolomite and calcite were added as reactants to a series of CaCl 2 -MgCl 2 solutions with variable Ca:Mg ratios at temperatures of 220°C and 240°C at vapour pressure in sixty experimental runs. Dolomitization of calcite and calcitization of dolomite in these runs indicates that the value of log ( aCa 2+ / aMg 2+ ) in solutions at equilibrium with calcite and dolomite ranges from about 0.4 to 0.9 at these temperatures. This is in agreement with previous experimental work at higher and lower temperatures. These experimentally determined equilibrium log ( aCa 2+ / aMg 2+ ) values are less than those calculated by thermodynamic based programs, such as SUPCRT and PTA, for equilibrium with ordered dolomite and those which may be calculated from calorimetric data obtained from ordered, ideal dolomite. This may indicate that the experimentally observed calcite-dolomite equilibrium is metastable and that the precipitated dolomites are imperfectly ordered. Precipitation of partially disordered, metastable dolomite of stoichiometric composition may be favoured over that of ideal dolomite at these temperatures for kinetic reasons.

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