Exposure history of ordinary chondrites

Details Exposure history of ordinary chondrites Exposure history of ordinary chondrites

May 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993avest..27...81a&link_type=abstract

Astronomicheskii Vestnik (ISSN 0320-930X), vol. 27, no. 3, p. 81-99

Astronomy and Astrophysics

Astronomy

2

Chondrites, Chronology, Exposure, Life (Durability), Abundance, Cluster Analysis, Cosmic Rays, Statistical Analysis

Scientific paper

Distributions of the cosmic-ray exposure ages of H-, L-, and LL-chondrites are studied. Exposure ages were calculated from cosmogenic He-3, Ne-21, and Ar-38 concentrations using the production rates according to O. Eugster. Distribution of L- and LL-chondrite exposure ages do not have any significant clustering while there is a clear peak at 6-7 Myr for H-chondrites. Average life-times of H-, L- and LL-chondrites in space after release from the parent bodies are found to be about 30 Myr. The assumption of S. Perlmutter and R. A. Muller concerning the clustering of H-chondrites exposure ages at 30 Myr is unlikely.

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