Noble gases,81KrKr ages, and10Be of chrondrites from China
作者： O. Eugster , Ch. Shen , J. Beer , M. Suter , W. Wölfli
DOI: 10.1016/0012-821X(87)90174-9
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摘要: Abstract A comprehensive study of the cosmic-ray exposure history five ordinary chondrites from China was carried out using measurements noble gas isotopic abundances and 10 Be concentrations. The following average ages, based on cosmogenic 21 Ne 81 Kr dating were obtained: Zhaodong (L4) — 15.7 ± 3.0 m.y., Nan Yang Pao (L6) 48 10.0 Guangrao 16.8 3.5 Lunan (H6) 26.7 5.0 m.y. H5 chondrite Zaoyang exposed for only 0.90 0.12 to galactic cosmic rays as calculated activity low amounts cosmic-ray-produced gases. contains large 80 82 produced by neutron capture bromine. From high slowing down density neutrons we derive a preatmospheric mass more than 1800 kg this meteorite.
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