Cosmogenic rare gases and the ⁴⁰K-⁴⁰Ar age of the kodaikanal iron meteorite

Creators: Bogard, D. D.; Burnett, D. S.; Wasserburg, G. J.

Abstract

Measurements have been made of the cosmogenic He, Ne, and Ar in the metal phase and of the K-Ar ages of two glass inclusions in the Kodaikanal iron meteorite. The small amounts of cosmogenic rare gas are best interpreted as due to a low cosmic ray exposure age. From empirical production rates, ages of 12, 15 and 15 m.y. were obtained from the ³He, ²¹Ne and ³⁸Ar concentrations, respectively. The ³He/²¹Ne, ³He/⁴He and ⁴He/³⁸Ar ratios are all consistent with low shielding during the exposure. The feldspar and glass have approximately equal K-Ar ages of 3.5 ± 0.1 and 3.3 ± 0.1 × 10⁹ yr, respectively. These results place constraints on possible origins for the glass and feldspar.

Additional Information

© 1968 Published by Elsevier B.V. Received 11 December 1968. The meteorite samples were generously supplied by Dr. E.J. Olsen of the Field Museum of Natural History (Chicago) and by Drs. P. Pellas, J. Orcel and F. Kraut of the Paris Natural History Museum. The initial development of the rare gas analytical techniques was done in collaboration with P. Ebcrhardt. We were assisted in tile measurements by P. Young and T. Wen. and we acknowledge profitable discussions with J.C. Huneke. This study was financed by NSF grants GP 7976 and GA 1073, NASA grant 05-002-044, and ONR research grant Nonr 220(47).

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Cosmogenic rare gases and the ⁴⁰K-⁴⁰Ar age of the kodaikanal iron meteorite

Abstract

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