Carbon isotopic thermometry calibrated by dolomite-calcite solvus temperatures

Details Carbon isotopic thermometry calibrated by dolomite-calcite solvus temperatures Carbon isotopic thermometry calibrated by dolomite-calcite solvus temperatures

Apr 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983gecoa..47..697w&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 47, Issue 4, pp.697-706

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18

Scientific paper

The temperature dependence of carbon isotopic fractionations between calcite and graphite, and between dolomite and graphite are calibrated by the calcite-dolomite solvus geothermometry using marbles collected from the contact metamorphic aureole in the Kasuga area, central Japan. The carbon isotopic fractionations ( 13 C Cc - Gr and 13 C Do --- Gr ) systematically decrease with increasing metamorphic temperature. The concordant relationships between the fractionations and solvus temperatures are approximately linear with T -2 over the temperature range. 400° to 680°C: 13 C Cc --- Gr (%.) = 5.6 × 10 6 × T -2 (K) - 2.4 13 C Do --- Gr (%.) = 5.9 × 10 6 × T -2 ( K ) - 1.9 These systematic relationships between fractionation and temperature suggest that carbon isotopic equilibria between carbonates and graphite were attained in many cases. The equation for the calcite-graphite system has a slope steeper than (1969) results. It is, however, in good agreement with that of and (1981) in the temperature range from 600° to 800°C. Because of the relatively high sensitivity to temperature, these isotopic geothermometers are useful for determining the temperatures in moderate- to high-grade metamorphosed carbonate rocks.

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