Mathematics – Logic
Scientific paper
Aug 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990gecoa..54.2161r&link_type=abstract
Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 54, Aug. 1990, p. 2161-2166.
Mathematics
Logic
6
Achondrites, Breccia, Geochemistry, Petrography, Regolith, Annealing, Carbonaceous Chondrites, Iron Meteorites, Olivine, Pyroxenes
Scientific paper
A 10 g sample of the Bholghati howardite was disaggregated in order to separate two eucrite clasts, several small carbonaceous clasts, fragments of diogenitic pyroxene, and bulk matrix. The eucrite clasts show evidence of moderately rapid cooling from a melt, followed by prolonged subsolidus annealing. The carbonaceous clasts mostly resemble CM2 carbonaceous chondrites with low-iron silicates and Fe-Ni sulphides in a fine grained dark matrix. One clast, however, is mineralogically, petrographically, and compositionally similar to a CI1 chondrite. Both carbonaceous and eucritic clasts have a complex history prior to incorporation into the howardite matrix with no evidence of significant metamorphism since assembly. Most clasts in the howardite breccia are monomineralic, with pyroxene and plagioclase predominant. Pyroxenes range from 'diogenitic' to 'eucritic' with diogenitic compositions most abundant; a significant number of intermediate compositions are present, consistent with derivation from a series of rocks related by fractionation.
Barrett Ruth A.
Buchanan Paul
Reid Michael A.
Zolensky Michael E.
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