Other
Scientific paper
Jul 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993metic..28q.384k&link_type=abstract
Meteoritics, vol. 28, no. 3, volume 28, page 384
Other
Chondrites, Exposure Ages, Halogens
Scientific paper
From the over 10,000 meteorites collected in Antarctica only 4 have been found still partially embedded in the ice. Allan Hills 82102 was found in the Far Western ice field of the Allan Hills, and was collected together with the surrounding ice. Two splits (120 and 170 mg) of this meteorite were obtained for the investigation of the enrichments of the halogens F, Cl, Br, and I. One split originated from the part embedded in ice, and the other from the area exposed to the atmosphere. Both splits reveal almost identical enrichment profiles, assuming a pristine concentration as measured for other H chondrites [1]. This finding indicates that this meteorite was not embedded in ice throughout its terrestrial history. In comparison to other H chondrites it can be demonstrated that the observed enrichment must be the result of prolonged exposure to the Antarctic atmosphere. In addition, it has been estimated that small Antarctic meteorites (<100 g) can be transported on the ice by strong winds [2]. Therefore, it is not possible that the terrestrial age of Allan Hills 82102 of 11,000 years (determined by C-14 measurement [3]) is a measure for the age of the surrounding ice. References: [1] Langenauer M. and Krahenbuhl U. (1993) Meteoritics, 28, 98- 104. [2] Cassidy W. et al. (1992) Meteoritics, 27, 490-525. [3] Nishiizumi K. et al. (1989) Nature, 340, 550-552.
Krähenbühl Urs
Langenauer Marcel
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