The Burnwell, Kentucky, Low-FeO chondrite fall: Description, classification and origin

Details The Burnwell, Kentucky, Low-FeO chondrite fall: Description, classification and origin The Burnwell, Kentucky, Low-FeO chondrite fall: Description, classification and origin

Jul 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998m%26ps...33..853r&link_type=abstract

Meteoritics & Planetary Science, vol. 33, no. 4, pp. 853-856.

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Scientific paper

The Burnwell, Kentucky, meteorite fell as a single stone on 4 September 1990. Burnwell has lower Fa in olivine (15.8 mol%), Fs in orthopyroxene (13.4 mol%), Co in kamacite (0.36 wt.%), FeO from bulk chemical analysis (9.43 wt.%), and (17O (0.51(0.02e), and higher Fe, Ni, Co metal (19.75 wt.% from bulk wet chemical analysis) than observed in H chondrites. Burnwell plots on extensions of H-L-LL chondrite trends for each of these properties towards more reducing compositions than in H chondrites. Extensions of this trend have been previously suggested in the case of other low-FeO chondrites or silicate inclusions in the IIE iron Netscha'vo, but interpretation of the evidence in these meteorites is complicated by terrestrial weathering, chemical disequilibrium or reduction. In contrast, Burnwell is an equilibrated fall that exhibits no evidence for reduction. As such, it provides the first definitive evidence for extension of the H-L-LL ordinary chondrite trend beyond typical H values, towards more reducing compositions.

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