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Isotopic composition and concentration of sulfur in carbonaceous chondritesNew 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.
Document ID
19930067748
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Gao, Xia
(NASA Lyndon B. Johnson Space Center Houston, TX, United States)
Thiemens, Mark H.
(California Univ. La Jolla, United States)
Date Acquired
August 16, 2013
Publication Date
July 1, 1993
Publication Information
Publication: Geochimica et Cosmochimica Acta
Volume: 57
Issue: 13
ISSN: 0016-7037
Subject Category
Lunar And Planetary Exploration
Accession Number
93A51745
Funding Number(s)
CONTRACT_GRANT: NAG9-83
Distribution Limits
Public
Copyright
Other

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