Multiple parent bodies of polymict brecciated meteorites

Details Multiple parent bodies of polymict brecciated meteorites Multiple parent bodies of polymict brecciated meteorites

Mar 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978gecoa..42..325c&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 42, Mar. 1978, p. 325-327.

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Achondrites, Chondrites, Meteoritic Composition, Oxygen Isotopes, Abundance, Breccia, Carbonaceous Chondrites, Enstatite, Meteorites, Brecciation, Polymict Breccias, Oxygen, Fragments, Cumberland Falls Meteorite, Plainview Meteorite, Isotopes, Composition, Parent Bodies, Chondrites, Breccias, Achondrites, Carbonaceous Chondrites, Collision

Scientific paper

In three brecciated meteorites, Bencubbin, Cumberland Falls and Plainview, the oxygen isotopic compositions of different rock types within each meteorite were determined to seek genetic relationships between them. In all cases the isotopic compositions are not consistent with derivation from a single parent body. There is no evidence that chondrites and achondrites could be derived from a common parent body. The chondritic inclusions in Bencubbin and Cumberland Falls cannot be identified with any of the ordinary chondritic meteorites. The carbonaceous chondritic fragments in Bencubbin are similar to, but not identical with, C2 meteorites. The achondritic portion of Bencubbin has a very unusual isotopic composition, which, along with its close relative Weatherford, sets it in a class distinctly apart from other achondrites. Lithic fragments in brecciated meteorites provide a wider range of rock types than is represented by known macroscopic meteorites. Collisions between some meteorite parent bodies were of sufficiently low velocity that fragments of both are preserved in breccias.

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