High-Resolution Multiple Sulfur Isotope Studies of Martian Meteorites

Details High-Resolution Multiple Sulfur Isotope Studies of Martian Meteorites High-Resolution Multiple Sulfur Isotope Studies of Martian Meteorites

Aug 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000stin...0013833m&link_type=abstract

Technical Report, California Univ. Los Angeles, CA United States Dept. of Earth and Space Sciences

Mathematics

Logic

High Resolution, Sulfur Isotopes, Pyrites, Snc Meteorites, Mars Surface, Carbonates, Fractionation, Ion Probes

Scientific paper

Sensitive, high resolution measurements of S-32, S-31, and S-34 in individual pyrite grains in martian meteorite ALH84001 by an in situ ion microprobe multi-collection technique reveal mass-independent anomalies in Delta.S-33 (Delta.S-33 = delta.S-33 - 0.516delta.S-34) in addition to the lowest 634S found in an extraterrestrial material. Low delta.S-34 values in two pyrite grains intimately associated with carbonate in ALH84001 can be explained by the sensitivity of sulfur to fractionations in the geologic environment. Anomalies in Delta.S-33 recorded in ALH84001 pyrites probably formed by gas-phase reactions in the early martian atmosphere (>4 Ga). The discovery of clearly resolvable Delta-S33 anomalies in 2 of 12 ALH84001 pyrites analyzed in their petrographic context in thin section, is considered strong evidence for crust-atmosphere exchange and the global cycling of volatile sulfur species on early Mars. These results corroborate previous measurements by Farquhar and co-workers who used a different technique that measures that bulk Delta.S-33 values of martian meteorites. These independent techniques, and their results, suggest that sulfur affected by mass-independent fractionation is common on Mars.

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