Oxygen Isotope Fractionation between Minerals and an Estimate of the Temperature of Formation

Details Oxygen Isotope Fractionation between Minerals and an Estimate of the Temperature of Formation Oxygen Isotope Fractionation between Minerals and an Estimate of the Temperature of Formation

Jan 1970

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1970sci...167..536o&link_type=abstract

Science, Volume 167, Issue 3918, pp. 536-538

Computer Science

3

Scientific paper

Oxygen isotopic compositions of separated minerals from three type A and four type B rocks are very uniform. The δ 18O values are: plagioclase, 6.20; clinopyroxene, 5.75; ilmenite, 4.45 (parts per thousand relative to Standard Mean Ocean Water). The isotopic distribution corresponds to equilibrium at 1120 degrees C. The isotopic composition of lunar pyroxenes falls within the range for pyroxenes of terrestrial mafic and ultramafic rocks, ordinary chondrites, enstatite chondrites, and enstatite achondrites, but above the range for basaltic achondrites, hypersthene achondrites, and mesosiderites. Glass isolated from the lunar soil has a δ 18O value of 6.2, significantly richer in 18O than the crystalline rock fragments in the soil.

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