Oxygen isotope fractionation in quartz, albite, anorthite and calcite

Details Oxygen isotope fractionation in quartz, albite, anorthite and calcite Oxygen isotope fractionation in quartz, albite, anorthite and calcite

Mar 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989gecoa..53..725c&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 53, Issue 3, pp.725-733

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44

Scientific paper

Laboratory measurements of equilibrium oxygen isotope fractionation in quartz, albite, anorthite, and calcite have been carried out by anhydrous exchange between silicates and calcite at temperatures of 600°C and above. Exchange in these systems is as rapid as exchange between silicates and water. Fractionation factors can be summarized in the following equations: ° qc = 0.38·10 6 T -2 Abc = -0.57·10 6 T -2 Anc = -1.59·10 6 T -2 from which the silicate-pair fractionations are readily obtained. These results are compared with published theoretical estimates as well as data derived from hydrothermal experiments. Some significant differences are found. In particular, it is difficult to reconcile all of the hydrothermal data either with theoretical calculations or with the present experimental data. The new experiments provide an internally consistent set of fractionation factors suitable for isotopic thermometry and for test of disequilibrium in natural systems.

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