¹James W. Dottin III, ¹James Farquhar, ²Jabrane Labidi
Geochimica et Cosmochimica Acta (in Press) Link to Article [https://doi.org/10.1016/j.gca.2018.01.013]
¹Department of Geology, University of Maryland, College Park, MD 20742, USA
²Department of Earth, Planetary, and Space Sciences, University of California, Los Angeles, CA 90095-1567, USA
Copyright Elsevier

This study reports the quadruple sulfur isotope composition of troilite nodules from Main Group Pallasites. Values range from -0.23‰ to 0.34‰ (average = 0.03±0.17‰ S.D.) in δ34S and 0.008‰ to 0.025‰ (average = 0.018± 0.006‰ S.D.) in Δ33S and -0.38 to -0.01 (average = -0.17±0.11‰ S.D.) in Δ36S. The variance of these analyses is comparable to estimates of analytical uncertainty (±0.3‰, ± 0.008‰, and ±0.3‰, for δ34S, Δ33S, and Δ36S, respectively) and the average of these values is taken as a constraint on the composition of sulfur in the MG Pallasite parent body. The different Δ33S value compared to CDT and IAB iron meteorites at a similar δ34S value is interpreted as a mass-independent signature. This signature is similar in magnitude and direction to previously published values observed in IIIAB iron meteorites, further supporting a genetic relationship between the two groups of meteorites.