| Abstract: | Sulphur contents and δ34S 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 δ34S 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 δ34S 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 δ34S patterns is low temperature oxidation during post-formation weathering. |
