Oxygen isotopic fractionation in the system quartz-albite-anorthite-water

Details Oxygen isotopic fractionation in the system quartz-albite-anorthite-water Oxygen isotopic fractionation in the system quartz-albite-anorthite-water

Jul 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979gecoa..43.1131m&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 43, Issue 7, pp.1131-1140

Physics

110

Scientific paper

Oxygen isotopic fractionations have been determined between quartz and water, albite and water, and anorthite and water at temperatures from 300 to 825°C, and pressures from 1.5. to 25 kbar. The equilibrium quartz-feldspar fractionation curves can be approximated by the following equations: 1000ln Q - PI = (0.46 + 0.55 )10 6 T -2 + (0.02 + 0.85 ) between 500 and 800°C 1000ln Q - PI = (0.79 + 0.90 )10 6 T -2 -- (0.43 - 0.30 ) between 400 and 500°C where is the mole-fraction of anorthite in plagioclase. Application of these isotopic thermometer calibrations to literature data on quartz and feldspar gives temperatures for some metamorphic rocks which are concordant with quartz-magnetite temperatures. Plutonic igneous rocks typically have quartz-feldspar fractionations which are substantially larger than the equilibrium values at solidus temperatures, indicating substantial retrograde exchange effects.

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