Multiple sulfur isotopic composition of main group pallasites support genetic links to IIIAB iron meteorites

Abstract 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 δ 34 S and 0.008‰ to 0.025‰ (average = 0.018 ± 0.006‰ S.D.) in Δ 33 S and −0.38 to −0.01 (average = −0.17 ± 0.11‰ S.D.) in Δ 36 S. The variance of these analyses is comparable to estimates of analytical uncertainty (±0.3‰, ±0.008‰, and ±0.3‰, for δ 34 S, Δ 33 S, and Δ 36 S, 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 Δ 33 S value compared to CDT and IAB iron meteorites at a similar δ 34 S 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.