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SULPHUR ISOTOPE RATIOS IN THE CANYON DIABLO METALLIC SPHEROIDS *
Author(s) -
McEwing C.E.,
Rees C.E.,
Thode H.G.
Publication year - 1983
Publication title -
meteoritics
Language(s) - English
Resource type - Journals
eISSN - 1945-5100
pISSN - 0026-1114
DOI - 10.1111/j.1945-5100.1983.tb00819.x
Subject(s) - troilite , canyon , spheroid , metal , impact crater , chemistry , mineralogy , isotope , weathering , geology , meteorite , chondrite , geochemistry , geomorphology , physics , astrobiology , biochemistry , in vitro , organic chemistry , quantum mechanics
Sulphur contents and δ 34 S values have been determined for metallic spheroids collected from the vicinity of Meteor Crater, Arizona. Large spheroids with diameters ∼ 1.3 mm contain about 20% more sulphur than do small spheroids with diameters ∼ 0.5 mm. The mean δ 34 S value for large spheroids is + 0.23°/∞, while that for small spheroids is + 0.4°/∞, both measured relative to Canyon Diablo troilite. Abrasion experiments on large spheroids show that δ 34 S varies radially within them, with values of ∼ 1.9δ/∞ at their surfaces, falling to zero at their centres. The favoured explanation for the observed sulphur content and δ 34 S patterns is low temperature oxidation during post‐formation weathering.