Abstract
Stepped combustion analysis of sulphur-bearing phases in SNC meteorites indicates that sulphates and sulphides are widespread at low abundance in these meteorites. The amount of sulphate sulphur is highest in shergottites: Shergotty (190 ppm) and ALHA 77005 (90 ppm). Nakhla and Chassigny contain lower sulphate sulphur contents (80–85 ppm) compared with shergottites, but their oxidised/reduced sulphur ratios are significantly greater ( ⩾ 1.5) which indicates higher net oxidation states. Nakhla and Chassigny also contain elemental sulphur as an additional oxidised component. An origin of the sulphates (and elemental sulphur) by terrestrial weathering processes cannot be completely rejected, but it is considered more likely that the minerals were incorporated into the host rocks as relict grains of weathering or alteration products formed on the surface of the SNC parent body.
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