Computer Science
Scientific paper
Nov 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975gecoa..39.1457s&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 39, Nov. 1975, p. 1457-1466. Research supported by the National Research Council of Canad
Computer Science
2
High Pressure, Iron Meteorites, Meteoritic Composition, Pressure Effects, Zincblende, Iron Compounds, Odessa Meteorite, Pressure Distribution, Troilite
Scientific paper
A method is outlined whereby the pressures of formation of some meteorites may be estimated from the mole fraction of FeS in their sphalerites. The FeS content of several sphalerites from meteorites of Ga-Ge group 1 is determined, and the pressures of formation of the meteorites are calculated assuming that FeS diffusion in sphalerite ceases at 350 C. Calculated pressures range from 0.2 to 3.1 kbar, corresponding to formation at the centers of metallic objects from 50 to 200 km in radius or in chondritic objects 100 to 410 km in radius. Formation at various depths in a compositionally-zoned object is suggested by the inverse correlation between Ge content and pressure of formation. Comparison of pressure estimates with radii estimated from cooling rates (Frickner, 1970) indicates that Odessa and Bogou meteorites formed in a single object from 180 to 410 km in radius.
Kissin Stephen A.
Schwarcz Henry P.
Scott Steven D.
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