Allan Hills 77081 - an unusual stony meteorite

Details Allan Hills 77081 - an unusual stony meteorite Allan Hills 77081 - an unusual stony meteorite

Nov 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982e%26psl..61...23s&link_type=abstract

Earth and Planetary Science Letters, vol. 61, no. 1, Nov. 1982, p. 23-31. Research supported by the Centre National de la Reche

Computer Science

27

Meteoritic Composition, Stony Meteorites, Abundance, Chemical Composition, Chondrites, Cosmic Rays, Mineralogy, Particle Tracks, Rare Gases

Scientific paper

Allan Hills (ALHA) 77081 is achondritic in texture while the mineral composition and the chemistry are chondritic with the exception of a few elements. An assignment to one specific group of ordinary chondrites is therefore difficult. In many respects this meteorite is similar to the unusual stone meteorite Acapulco. The REE pattern of ALHA 77081 is essentially flat and the distribution ratios of siderophile elements between metal and silicates are high compared to ordinary chondrites. Gas retention ages are 3.5 plus or minus 0.5 AE for U, Th-He and 4.50 plus or minus 0.15 AE for K-Ar. In spite of the high degree of recrystallization, the meteorite contains trapped noble gases in amounts comparable to type 4 chondrites. Cosmic ray tracks and spallogenic noble gases indicate a small preatmospheric radius of about 2-3 cm. Spallogenic nuclides produced by solar cosmic rays or stopped solar flare ions may be present.

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