Exposure history of ordinary chondrites.

Details Exposure history of ordinary chondrites. Exposure history of ordinary chondrites.

Nov 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993sosyr..27..273a&link_type=abstract

Solar System Research, Vol. 27, No. 3, p. 273 - 288

Physics

1

Chondrites: Ages

Scientific paper

Distributions of the exposure ages of the most commonly encountered chemical groups of stone meteorites, the H-, L-, and LL-chondrites, are studied. The ages are calculated on the basis of the content of stable cosmogenic isotopes (3He, 21Ne, and 38Ar) together with recourse to new data on the rate of formation of these isotopes. While statistically significant clusterings were found in the distributions of the ages of the L- and LL-chondrites, there was a distinct peak at 6 - 7 Myr in the case of the H-chondrites. The mean lifetime of the H-, L-, and LL-chondrites following release from parent bodies was found to be around 30 Myr, which is in agreement with theoretical estimates if it is assumed that the meteorites were created in cratering events in asteroid collisions in the main asteroid belt. A previously suggested hypothesis of Perlmutter and Muller (1988) of a peak at 30 Myr in the distribution of the exposure ages of H-chondrites coordinated with one of the periods of mass extinctions on the Earth seems to be highly unlikely.

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