Pre-atmospheric depths and thermal histories of Canyon Diablo spheroids

Details Pre-atmospheric depths and thermal histories of Canyon Diablo spheroids Pre-atmospheric depths and thermal histories of Canyon Diablo spheroids

Jul 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002m%26ps...37.1015l&link_type=abstract

Meteoritics & Planetary Science, vol. 37, no. 7, pp. 1015-1025 (2002)

Physics

2

Scientific paper

Despite having melted during formation, seven of eight Canyon Diablo spheroids weighing from 0.6 to 13 mg retain cosmic-ray-produced 38Ar (38Arcos) in concentrations [10-10 cm3 STP/g] ranging from 0.35 to 68. The presence of 38Arcos is consistent with pre-atmospheric depths of less than 2.3 meters and most likely rules out an origin for the spheroids deep within the projectile, which had a radius of about 15 m. Low levels of 21Necos indicate gas loss from these spheroids. Relative to most Canyon Diablo meteorites, the spheroids contain lower concentrations of cosmogenic noble gases. The difference partly reflects diffusion losses from the spheroids, especially for 3He and 21Ne, but also suggests deeper locations on average for the precursor material, consistent with independent results from 59Ni.

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