Hydrothermal Systems on Mars. Insights from Sulfur Isotopic Systematics in Alteration Assemblages in Martian Meteorite Allan Hills 84001

Details Hydrothermal Systems on Mars. Insights from Sulfur Isotopic Systematics in Alteration Assemblages in Martian Meteorite Allan Hills 84001 Hydrothermal Systems on Mars. Insights from Sulfur Isotopic Systematics in Alteration Assemblages in Martian Meteorite Allan Hills 84001

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27.1183s&link_type=abstract

Lunar and Planetary Science, volume 27, page 1183

Other

Hydrothermal Systems, Isotopes: Sulfur, Mars, Meteorites: Snc, Microprobes: Ion

Scientific paper

Crustal processes and reactions during hydrothermal and biogenic activity result in extreme degrees of sulfur isotopic fractionation on Earth. For example, delta ^(34)S in terrestrial sulfides ranges from -70 per mil to +70 per mil on Earth. In contrast, delta ^(34)S values for sulfides from other planetary bodies that have been sampled (Moon, asteroids) show a very limited mass fractionation. The standard deviation in the bulk isotopic composition of sulfur in meteorites of all types is less than 0.1 per mil. However, the isotopic composition of sulfides in meteorites shows slightly more variability. Troilite in Orgueil, a carbonaceous chondrite, has a delta ^(34)S of 2.6 per mil. Kaplan and Hulston showed that sulfides in enstatite chondrites have delta ^(34)S of between +1.6 to +2.5 per mil. The delta ^(34)S in troilite from ordinary chondrites ranges from -2.7 per mil to +2.5 per mil. The slight fractionation of delta ^(34)S into these sulfides has been attributed to nebular heterogeneity, low temperature (100 degrees C) reactions between water and elemental sulfur, and oxidation of FeS in an aqueous environment. Lunar materials exhibit a much broader variation in bulk delta ^(34)S than has been observed in meteorites. Whereas bulk lunar rocks show variability on the order of +0.37 to +0.68, lunar soils have delta ^(34)S as high as +9.76 per mil. These high values in the bulk lunar soils have been attributed to preferential volatilization of ^(32)S during sputtering caused by micrometeorite bombardment. Until now, S fractionation processes on the larger terrestrial planets such as Mercury, Venus, and Mars has been only speculative. With the discovery of a possible martian meteorite with an imprint of a martian hydrothermal system, we can gain insights into S fractionation on another planet.

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