Equilibrium garnet-calcite oxygen isotope fractionation

Details Equilibrium garnet-calcite oxygen isotope fractionation Equilibrium garnet-calcite oxygen isotope fractionation

Jul 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995gecoa..59.2839r&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 59, Issue 13, pp.2839-2842

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6

Scientific paper

The equilibrium oxygen isotope fractionation between grossular/andradite garnet and calcite has been determined experimentally by direct exchange from 800-1200°C at ~23 kbar. A least-squares fit to the equilibrium fractionation data reflected through the origin has the functional form for temperatures greater than 800°C (±2 errors). This is in good agreement with the difference between the reduced partition function ratios of the two phases recalculated for the purpose of comparison. The temperature coefficient from the experimental data curve has been combined with those of previous mineral-calcite exchange experiments to produce an internally consistent set of garnet-mineral oxygen isotope geothermometers.

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