Solar noble gases in the unique chondritic breccia Allan Hills 85085

Details Solar noble gases in the unique chondritic breccia Allan Hills 85085 Solar noble gases in the unique chondritic breccia Allan Hills 85085

Dec 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990e%26psl.101..139e&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 101, no. 2-4, Dec. 1990, p. 139-147. Research supported by SNSF.

Other

5

Breccia, Chondrites, Meteoritic Composition, Rare Gases, Solar Corona, Cosmic Rays, Isotope Effect, Lunar Composition, Silicates

Scientific paper

The chemical composition of the chondritic breccia Allan Hills 85085 does not match that of any known group of chondrites. In this work, the noble gas isotopic abundances were investigated in bulk samples, in a fine-grained silicate fraction, and in a coarse-grained fraction containing the metal phase. Solar gases are present in the fine-grained silicates and indicate processing of the ALH85085 material in an asteroidal regolith. He and Ne are enriched in a smaller than 40-micron grain size fraction, indicating surface implantation of solar particles. The solar noble gas component is characterized by an elemental abundance pattern and isotopic ratios typical for lunar and asteroidal regolith material. The major noble gas component in the bulk and coarse-grained fractions are planetary-type trapped gases. Abundances and isotopic composition are similar to those in type-2 and -3 chondrites. In some aspects, ALH85085 resembles another unique chondrite, Kakangari, but it differs in its FeNi content that is almost twice as high as in Kakangari, and in other characteristics.

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