Leya, I., Wieler, R., Ma, P., Schnabel, C. and Herzog, G.F. (2002) Pre-atmospheric depths and thermal histories of Canyon Diablo spheroids. Meteoritics and Planetary Science, 37(7), pp. 1015-1025.
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Publisher's URL: http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=2002M%26PS...37.1015L&db_key=AST&high=411cbf3e4729176
Abstract
Despite having melted during formation, seven of eight Canyon Diablo spheroids weighing from 0.6 to 13 mg retain cosmic-ray- produced Ar-38 (Ar-38(cos)) in concentrations (10(-10) cm(3) STP/g) ranging from 0.35 to 68. The presence of Ar-38(cos) is consistent with pre-atmospheric depths of less than 2.3 m 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 Ne- 21(cos) 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 He-3 and Ne-21, but also suggests deeper locations on average for the precursor material, consistent with independent results from Ni-59.
| Item Type: | Articles |
|---|---|
| Status: | Published |
| Refereed: | Yes |
| Glasgow Author(s) Enlighten ID: | Schnabel, Dr Christoph |
| Authors: | Leya, I., Wieler, R., Ma, P., Schnabel, C., and Herzog, G.F. |
| Subjects: | Q Science > QE Geology |
| College/School: | College of Science and Engineering > Scottish Universities Environmental Research Centre |
| Journal Name: | Meteoritics and Planetary Science |
| ISSN: | 1086-9379 |
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