Fragmental breccias and the collisional evolution of ordinary chondrite parent bodies

Details Fragmental breccias and the collisional evolution of ordinary chondrite parent bodies Fragmental breccias and the collisional evolution of ordinary chondrite parent bodies

Sep 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983metic..18..179r&link_type=abstract

Meteoritics (ISSN 0026-1114), vol. 18, Sept. 30, 1983, p. 179-196.

Computer Science

25

Breccia, Chondrites, Collision Parameters, Evolution (Development), Abundance, Impact Melts, Petrology, Photomicrography

Scientific paper

The authors' survey of type 4 - 6 ordinary chondrites indicates that gas-poor, melt-rock and/or exotic clast-bearing fragmental breccias constitute 5%, 22% and 23%, respectively, of H, L and LL chondrites. These abundances contrast with the percentages of solar-gas-rich regolith breccias among ordinary chondrites. The low abundance of regolith breccias among L chondrites and evidence that at least two-thirds of the L chondrites suffered a major shock event 0.5 Gyr ago, suggest that the L parent body may have been disrupted by a major collision at that time and that the remaining parent body fragments were too small to develop substantial regoliths. The high proportion of genomict brecciated LL chondrites reflects a complex collisional history, probably including several episodes of parent body disruption and gravitational reassembly. Differences in the abundances of different kinds of breccias among the ordinary chondrite groups are probably due to the stochastic nature of major asteroidal collisions.

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