Noble gases, Kr-81-Kr ages, and Be-10 of chondrites from China

Details Noble gases, Kr-81-Kr ages, and Be-10 of chondrites from China Noble gases, Kr-81-Kr ages, and Be-10 of chondrites from China

Jun 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987e%26psl..84...42e&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 84, no. 1, June 1987, p. 42-50. SNSF-supported research.

Computer Science

8

Beryllium 10, Chondrites, Galactic Cosmic Rays, Krypton Isotopes, Meteoritic Composition, Rare Gases, Capture Effect, China, Radiation Effects, Meteorites, Chondrites, Rare Gases, Age, Isotopic Ratios, Dating Methods, Krypton, Beryllium 10, Composition, Samples, Meteorite, Exposure Age, Cosmic Rays, Ordinary Chondrites, Abundance, Concentration, Zhaodong, Stony Meteorites, L Chondrites, H Chondrites, Laboratory Studies, Mass, Nan Yang Pao, Guangrao, Lunan, Zaoyang, Parent Bodies, Experiments, Procedure, Tra

Scientific paper

A comprehensive study of the cosmic-ray exposure history of ordinary chondrites from China was carried out using measurements of the noble gas isotopic abundances and Be-10 concentrations. The following average cosmic-ray exposure ages, based on cosmogenic Ne-21 and on Kr-81-Kr dating were obtained: Zhaodong (L4) - 15.7 + or - 3.0 Myr, Nan Yang Pao (L6) - 48 + or - 10.0 Myr, Guangrao (L6) - 16.8 + or - 3.5 Myr, and Lunan (H6) - 26.7 + or - 5.0 Myr. The H5 chondrite Zaoyang was exposed for only 0.90 + or - 0.12 Myr to Galactic cosmic rays, as calculated from the Be-10 activity and from the low amounts of cosmic-ray-produced noble gases. The Zaodong chondrite contains large amounts of Kr-80 and Kr-82 produced by neutron capture of bromine. From the high slowing down density for neutrons, a preatmospheric mass of more than 1800 kg is derived for this meteorite.

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