Hydrogen and oxygen isotope compositions in kerogen from the Orgueil meteorite: Clues to a solar origin

Journal Article · Tue May 01 00:00:00 EDT 1990 · Geochimica et Cosmochimica Acta; (USA)

DOI:https://doi.org/10.1016/0016-7037(90)90168-K· OSTI ID:6205359

Halbout, J; Robert, F; Javoy, M ^[1]

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1. IPGP Universite Paris VII (France)

Hydrogen and oxygen isotope contamination of acid-demineralized residues of the Orgueil carbonaceous meteorite has been accurately determined by an original method involving isotopically labeled reagents. Results are consistent with contamination occurring by addition and by isotopic exchange of a fraction of the indigenous reservoir with the reagents. The isotopic compositions of the uncontaminated non-exchangeable fraction of the acid residues are: {delta}D = +1,360{per thousand}, {delta}{sup 17}O = +3.3{per thousand}, {delta}{sup 18}O = +6.0{per thousand}. They are ascribed to the mean insoluble meteoritic organic matter. It is unlikely that the number of isotopic reservoirs in the acid residues exceed 2. These results imply that, if organic oxygen and hydrogen acquired their isotopic compositions in the same environment, the process yielding the large deuterium enrichment of the insoluble kerogen has occurred within the solar gas, i.e., within the dense molecular cloud that gave birth to the solar nebula. In the course of this study, isotopically light carbon ({delta}{sup 13}C {le} {minus}48{per thousand}) has been detected in the stepwise pyrolysis of Orgueil acid residues.

• OSTI ID: 6205359
• Journal Information: Geochimica et Cosmochimica Acta; (USA), Vol. 54:5; ISSN 0016-7037
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
METEORITES
PETROCHEMISTRY
PETROGENESIS
ACIDIFICATION
COSMOLOGICAL MODELS
HYDROGEN ISOTOPES
ISOTOPE RATIO
ISOTOPIC EXCHANGE
KEROGEN
OXYGEN ISOTOPES
RESIDUES
BITUMINOUS MATERIALS
CARBONACEOUS MATERIALS
ISOTOPES
MATERIALS
MATHEMATICAL MODELS
ORGANIC MATTER
580000* - Geosciences
640106 - Astrophysics & Cosmology- Cosmology