Nuclear tracks and light noble gases in ALH84001: Preatmospheric size, fall characteristics, cosmic ray exposure duration and formation age

Details Nuclear tracks and light noble gases in ALH84001: Preatmospheric size, fall characteristics, cosmic ray exposure duration and formation age Nuclear tracks and light noble gases in ALH84001: Preatmospheric size, fall characteristics, cosmic ray exposure duration and formation age

Jan 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997m%26ps...32...91g&link_type=abstract

Meteoritics, vol. 32, pages 91-96

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9

Scientific paper

Cosmic ray produced nuclear tracks and noble gases have been studied in the martian orthopyroxenite ALH84001, to delineate its cosmic ray exposure history, preatmospheric size and fall characteristics. A K-Ar age of 3.9Ga, cosmic ray exposure duration of 16.7Ma and a preatmospheric radius of 10cm have been deduced from the noble gas and track data. The track data suggest ALH84001 to be a single fall that has suffered atmospheric mass ablation in excess of 85%, higher than the value deduced for the shergottites, ALH77005, EET79001 and Shergotty. The formation age as well as the cosmic ray exposure duration determined in this work are in good agreement with values reported earlier, and are distinctly different from the other SNC meteorites analysed so far. The high cosmogenic 22Ne/21Ne ratio of 1.22 most probably reflects an effect due to non-chondritic composition of ALH84001 as the track data suggest high shielding (^5cm) for the analysed samples. There are signatures in the noble gas data that indicate the possible presence of trapped Ar and Ne of martian atmospheric origin in ALH84001.

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