Computer Science
Scientific paper
Jul 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993gecoa..57.3159g&link_type=abstract
Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 57, no. 13, p. 3159-3169.
Computer Science
28
Carbonaceous Chondrites, Chemical Composition, Chemical Evolution, Interstellar Chemistry, Isotopes, Sulfur, Anomalies, Atomic Structure, Chemical Analysis, Neutrons, Meteorites, Stony Meteorites, Chondrites, C Chondrites, Isotopes, Composition, Concentration, Sulfur, Laboratory Studies, Procedure, Anomalies, Parent Bodies, Nebular Processes, Chondrules, Alha84029, Models, Mixing, Structure, Organic Material, Phases, Warrenton, Sulfate, Sulfide, Isotopic Ratios, Samples, Meteorite, Allende, Orgueil, Murchis
Scientific paper
New sulfur isotopic ratio measurements are reported for seven carbonaceous chondrites. Newly developed procedures permit measurement of delta S-33, delta S-34, and delta S-36 at precisions significantly greater than previously reported. A search for S-36 nucleosynthetic anomalies coproduced with anomalies in, for example, Ti-50 and Ca-48 was negative. The high endemic sulfur concentration probably dilutes any S-36 anomaly, and separation of individual sulfur phases may be needed to identify S-36 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. The insoluble organics appear to be of either aliphatic or alicyclic structure and are dominant phases.
Gao XingHui
Thiemens Mark H.
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