A new kind of primitive chondrite, Allan Hills 85085

Details A new kind of primitive chondrite, Allan Hills 85085 A new kind of primitive chondrite, Allan Hills 85085

Dec 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988e%26psl..91....1s&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 91, no. 1-2, Dec. 1988, p. 1-18.

Mathematics

Logic

69

Chondrites, Iron Compounds, Metallicity, Meteoritic Composition, Nickel Compounds, Metamorphism (Geology), Solar Corona, Solar System

Scientific paper

Allan Hills (ALH) 85085, a chemically and mineralogically unique chondrite whose components have suffered little metamorphism or alteration, is discussed. It is found that ALH 85085 has 4 wt pct chondrules (mean diameter 16 microns), 36 wt pct Fe, Ni, 56 wt pct lithic and mineral silicate fragments, and 2 wt pct trolite. It is suggested that, with the exception of matrix lumps, the components of ALH 85085 formed and accreted in the solar nebula. It is shown that ALH 85085 does not belong to any of the nine chondrite groups and is very different from Kakangari. Similarities between ALH 85085 and Bencubbin and Weatherford suggest that the latter two primitive meteorites may be chondrites with high metal abundances and very large, partly fragmented chondrules.

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