36Cl and53Mn in Antarctic meteorites and10Be-36Cl dating of Antarctic ice |
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| Authors: | K. Nishiizumi J.R. Arnold D. Elmore X. Ma D. Newman H.E. Gove |
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| Affiliation: | 1. Department of Chemistry, B-017, University of California at San Diego, La Jolla, CA 92093U.S.A.;2. Nuclear Structure Research Laboratory, University of Rochester, Rochester, NY 14627U.S.A. |
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| Abstract: | Cosmic-ray-produced53Mn (t1/2 = 3.7 × 106years) has been measured in twenty Antarctic meteorites by neutron activation analysis.36Cl (t1/2 = 3.0 × 105years) has been measured in fourteen of these objects by tandem accelerator mass spectrometry. Cosmic ray exposure ages and terrestrial ages of the meteorites are calculated from these results and from rare gases.14C (t1/2 = 5740years) and26Al (t1/2 = 7.2 × 105years) data. The terrestrial ages range from 3 × 104 to 5 × 105 years. Many of the L3 Allan Hills chrondrites seem to be a single fall based on these results. In addition,10Be (t1/2 = 1.6 × 106years) and36Cl have been measured in six Antarctic ice samples. The first measurements of10Be/36Cl ratios in the ice core samples demonstrate a new dating method for ice. |
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