The record of cosmogenic, radiogenic, fissiogenic, and trapped noble gases in recently recovered Chinese and other chondrites

Details The record of cosmogenic, radiogenic, fissiogenic, and trapped noble gases in recently recovered Chinese and other chondrites The record of cosmogenic, radiogenic, fissiogenic, and trapped noble gases in recently recovered Chinese and other chondrites

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993gecoa..57.1115e&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 57, no. 5, p. 1115-1142.

Computer Science

45

Chondrites, Gas Composition, Meteoritic Composition, Radioactive Isotopes, Rare Gases, China, Energetic Particles, Lunar Surface, Solar Wind, Meteorites, Stony Meteorites, Chondrites, Rare Gases, Trapping, Data, Laboratory Studies, Abundance, Samples, Meteorite, Outgassing, Size, Temperature, Ordinary Chondrites, C Chondrites, Petrology, Isotopes, Potassium, Exposure Age, Cosmic Rays, Nuclides, Age, Thermal History, Fission, Catalog, Procedure, Solar Wind, Origin, Source, Concentration, Energetic Particles,

Scientific paper

Noble-gas isotopic abundances were determined in 36 recently recovered chondrites including 27 chondrites recovered in China. The comparison of the release patterns of trapped noble gases from ordinary and from carbonaceous chondrites showed that the planetary trapped noble gases in ordinary chondrites were released mainly above 1200 C, whereas more than 85 percent of noble gases trapped in carbonaceous chondrites were released at or below 1200 C, indicating that the carrier phases of the trapped noble gases in ordinary and in carbonaceous chondrites may not be the same. It is suggested that the ordinary chondrites started to retain fission Xe about 48 +/- 30 Ma earlier than Angra dos Reis. No systematic differences were observed between H, L, and LL or type 5 and 6 chondrites with respect to the time of fission Xe retention. Eight chondrites displayed neutron capture effects due to secondary cosmic-ray-produced neutrons.

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