Computer Science
Scientific paper
Nov 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997m%26ps...32..769s&link_type=abstract
Meteoritics & Planetary Science, vol. 32, no. 6, pages 769-773
Computer Science
14
Scientific paper
We have measured the concentrations of the cosmogenic radionuclides 10Be, 26Al and 36Cl (half-lives 1.51 Ma, 716 ka, 300 ka, respectively) in two different laboratories by AMS techniques, as well as concentrations and isotopic compositions of stable helium, neon and argon in the Antarctic H-chondrite Allan Hills 88019. In addition, nuclear track densities were measured. From these results it is concluded that the meteoroid ALH 88019 had a pre-atmospheric radius of (20 ( 5) cm and a shielding depth for the analyzed samples of between 4 and 8 cm. Using calculated and experimentally determined production rates of cosmogenic nuclides, an exposure age of about 40 Ma is obtained from cosmogenic 21Ne and 38Ar. The extremely low concentrations of radionuclides are explained by a very long terrestrial age for this meteorite of (2.2 ( 0.4) Ma. A similarly long terrestrial age was found so far only for the Antarctic L-chondrite Lewis Cliff 86360. Such long ages establish one boundary condition for the history of meteorites in Antarctica.
Knauer M.
Kubik Peter W.
Leya Ingo
Lipschutz Michael E.
Metzler Knut
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