Other
Scientific paper
Jan 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992phdt........42g&link_type=abstract
Thesis (PH.D.)--UNIVERSITY OF CALIFORNIA, SAN DIEGO, 1992.Source: Dissertation Abstracts International, Volume: 53-01, Section:
Other
Chondrites
Scientific paper
We report the measurement of sulfur isotope ratios (delta33S, delta34S, and delta36S) in meteoritic material, the external precision and accuracy is +/-0.03perthous, +/-0.04perthous and +/-0.2perthous for delta33S, delta34S and delta36S, respectively. Chemical procedures have been developed for the quantitative extraction of sulfur from metallic iron, acid residues and mineral grains. The bulk S analyses have shown systematic variations among chondrite classes. The isotopic variations of bulk samples and different S phases within one specimen in stony meteorites are in mass dependent fractionation fashion. No nuclear isotopic anomalies have been observed. Enrichments of 33 S and 36S have been found in the metallic phase of iron meteorites at consistent Delta33S/ Delta36S ratios. The excess is likely produced by spallation reactions. The metal associated S is apparently derived from two phases, one acid soluble and the other acid resistant. Enrichments in 33S and 36S ranging from 7.65E + 10 to 2.42E + 14 (atoms/g), and 4.33E + 10 to 4.11E + 13 (atoms/g), respectively, have been found in these phases. The ratio of excess 33S and 36S (Delta 33S/Delta^ {36}S) is relatively constant between the various iron meteorites, consistent with production by cosmic ray induced spallation reactions. However, the production ratio of Delta^{33 }S/Delta36 S from both experimental determinations and semiempirical calculations of cosmogenic nuclei, is a factor of 2 smaller than is observed. Further study of the fractional yield of 36S from its isobars following energetic proton reaction with iron is needed to evaluate whether this contribution to the apparent ^{rm 36}S excess is significant.
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