Oxygen and carbon isotope fractionations between CO 2 and calcite

Details Oxygen and carbon isotope fractionations between CO 2 and calcite Oxygen and carbon isotope fractionations between CO 2 and calcite

Oct 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991gecoa..55.2867c&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 55, Issue 10, pp.2867-2882

Physics

49

Scientific paper

Oxygen and carbon isotopic fractionation factors have been measured by direct exchange between carbon dioxide and calcite over the temperature range 400-950°C at pressures of 1-13 kilobars. Equilibrium constants for oxygen exchange are well determined from 400 to 800°C, and differ substantially from previous experimental and theoretical estimates. Carbon isotopic fractionations have larger uncertainties at all temperatures. Both oxygen and carbon isotopic fractionations are well reproduced by statistical mechanical calculations with simple treatment of the calcite lattice vibrations. A recalculated calcite-graphite fractionation curve based on new calculations of partition functions ratios for calcite suggests that this system is well suited for high-temperature isotopic thermometry of graphitic marbles as first proposed by and (1981). The rate of exchange of both oxygen and carbon between carbon dioxide and calcite is rapid, and proceeds by a combination of diffusion and minor recrystallization.

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