Limits on the effect of pressure on isotopic fractionation

Details Limits on the effect of pressure on isotopic fractionation Limits on the effect of pressure on isotopic fractionation

Aug 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975gecoa..39.1197c&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 39, Issue 8, pp.1197-1201

Physics

16

Scientific paper

The equilibrium distribution of oxygen isotopes between calcium carbonate and water was determined at 500°C at pressures from 1 to 20 kbar and at 700°C at pressures of 0.5 and 1 kbar. At both temperatures, the pressure-dependence of the fractionation factor was below the limit of detection. The experimental results are consistent with theoretical estimates of the volume change due to isotope substitution. Application of the theory to silicate systems leads to the conclusion that pressure effects on oxygen isotopic fractionation between silicates are < 0.2% at pressures of tens of kilobars. Thus the observed large variations of O 18 /O 16 ratio in kimberlitic eclogites cannot be attributed to the effect of pressure

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