Noble gases in H-chondrites and potential differences between Antarctic and non-Antarctic meteorites

Journal Article · Tue Jan 01 04:00:00 EST 1991 · Geochimica et Cosmochimica Acta; (USA)

DOI:https://doi.org/10.1016/0016-7037(91)90399-P· OSTI ID:5836054

Schultz, L; Weber, H W; Begemann, F ^[1]

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1. Max-Planck-Institut fuer Chemie, Mainz (West Germany)

Thirty-one Antarctic H-chondrites from the Allan Hills have been analyzed for their noble gases. Seven of the specimens contain solar gases; thirteen have a cosmic-ray exposure age around 8 Ma. Both fractions are as observed for H-chondrites from the rest of the world. Scrutiny of the data for paired samples yields a minimum number of 17 independent falls, with 6 falls required for the 8 Ma peak of exposure age. The distribution of exposure ages as well as that of radiogenic {sup 4}He and {sup 40}Ar yield no evidence that H-chondrites from the Allan Hills region represent a mixture of populations that is different from that brought to moderate latitudes of the Earth in more recent times.

• OSTI ID: 5836054
• Journal Information: Geochimica et Cosmochimica Acta; (USA), Journal Name: Geochimica et Cosmochimica Acta; (USA) Vol. 55:1; ISSN GCACA; ISSN 0016-7037
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
580000* -- Geosciences
AGE ESTIMATION
ANTARCTIC REGIONS
ANTARCTICA
CHEMICAL COMPOSITION
CHEMISTRY
CHONDRITES
COMPARATIVE EVALUATIONS
COSMIC GASES
COSMIC RADIATION
ELEMENTS
FLUIDS
GASES
GEOCHEMISTRY
IONIZING RADIATIONS
METEORITES
NONMETALS
POLAR REGIONS
RADIATIONS
RARE GASES
STONE METEORITES