Abstract
New sulfur isotopic ratio measurements are reported for seven carbonaceous chondrites. Newly developed procedures permit measurement of δ 33S, δ 34S, and δ 36S at precisions significantly greater than previously reported. A search for 36S nucleosynthetic anomalies coproduced with anomalies in, for example, 50Ti and 48Ca was negative. The high endemic sulfur concentration probably dilutes any 36S anomaly, and separation of individual sulfur phases may be needed to identify 36S carrier phases. Large internal isotopic variations are observed, deriving from parent body and possibly nebular processes. Chondrule separates from Allende demonstrate isotopic compositions which vary as a function of diameter. High-temperature gas-solid exchange and a two-component mixing model may account for the observations. High-resolution isotopic data and structural information are reported for organic sulfur compounds separated by chemical extractions
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