Mathematics – Logic
Scientific paper
Mar 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993gecoa..57.1079z&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 57, Issue 5, pp.1079-1091
Mathematics
Logic
69
Scientific paper
Thermodynamic oxygen isotope factors for anhydrous silicate minerals have been calculated by means of the modified increment method. The obtained order of 18 O enrichment in common rockforming minerals is quartz > albite K-feldspar > sillimanite leucite > andalusite > Jadeite > kyanite > anorthite cordierite > diopside > wollastonite > zircon garnet > olivine. Two sets of self-consistent fractionation factors between quartz and the silicate minerals and between the silicate minerals and water have been respectively obtained for a temperature range of 0 to 1200°C. The present results on the quartz-mineral systems are in good agreement with high-temperature data derived from semi-empirical calibrations and calcite-exchange experiments, demonstrating that the present calculated fractionation factors for mineral pairs are applicable to isotopic geothermometry and as a test of disequilibrium in natural mineral assemblages over all temperature ranges of geological interest. The silicate-water fractionations obtained from the present calculations also match those from hydrothermal experiments (except 3-isotope exchange results). The present calculations provide a potential insight into the quantitative dependence of oxygen isotope fractionation upon chemical composition and structural state of minerals. Minerals may be depleted in 18 O with increasing pressure as a result of the change in crystal structures.
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