Computer Science
Scientific paper
Mar 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988metic..23...25e&link_type=abstract
Meteoritics (ISSN 0026-1114), vol. 23, March 1988, p. 25-27. SNSF-supported research.
Computer Science
3
Carbonaceous Chondrites, Galactic Cosmic Rays, Meteoritic Composition, Petrology, Radioactive Age Determination, Rare Gases, Algorithms, Error Analysis, Mass Spectrometers, Meteorites, Guangnan, Ningqiang, L6 Chondrites, Cv3 Chondrites, Helium 4, Stony Meteorites, Exposure Age, Chondrites, Isotopes, Abundance, Argon 40, Rare Gases, Samples, Meteorite, Concentrations, Radiogenic Material, Age, Comparisons, Carbonaceous Chondrites, Laboratory Studies, Procedure, Thermal History, Trapping, Samples, Meteorite
Scientific paper
The radiogenic ages and Galactic cosmic-ray exposure ages (EAs) of two unusual chondrites are determined by measuring their noble-gas isotope abundances. The results are presented in tables and analyzed. Guangnan is found to have EA 2.9 + or - 0.4 Myr, low concentrations of radiogenic He-4 and Ar-40, U/Th-(He-4) age 27 + or - 16 Myr, and (K-40)-(Ar-40) age 142 + or - 14 Myr, consistent with significant gas loss no later than the onset of cosmic-ray exposure. Ningqiang has EA 42.2 + or - 4.0 Myr, U/Th-(He-4) age 4.17 + or - 0.16 Gyr, and (K-40)-(Ar-40) age 4.26 + or - 0.07 Gyr.
Eugster Otto
Michel Th.
Niedermann Samuel
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