Cosmogenic Nuclides in the Tsarev Chondrite

Details Cosmogenic Nuclides in the Tsarev Chondrite Cosmogenic Nuclides in the Tsarev Chondrite

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992metic..27..234h&link_type=abstract

Meteoritics, vol. 27, no. 3, volume 27, page 234

Computer Science

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Scientific paper

Long-lived and stable cosmogenic nuclides were determined in the Tsarev chondrite, L5, which fell in 1922. ^3He, ^21Ne, ^10Be, ^26Al, and ^53Mn were found in 8 fragments as shown in the table in the printed version of this abstract. The ^22Ne/^21Ne ratios were 1.08-1.12 after corrections for the trapped components. These ratios are not indicative for shielding. ^3He/^21Ne ratios of 2-2.5 seem to indicate approximate levels of the shielding, in spite of possible He escape. In #15383 for example, ^10Be(sub)bulk/^10Be(sub)metal = 7.0+-0.4 and ^26Al(sub)bulk/^26Al(sub)metal = 40+-5 were obtained. These are 2-2.5 times higher than those in ordinary size chondrites. The levels of the ^10Be and ^26Al in stones and metals are lower than usual down to 1/3-1/4 and 1/10 respectively. The lower production rates of noble gases in #15383 can be estimated relative to these radio-nuclides; or 0.1E-8 cc^21Ne/gmy and 0.2E-8 cc^3He/gmy. Based on a single-stage model, 8+-1 my can be estimated for the exposure age. The lower productions of these nuclides can be attributed to a large preatmospheric body of more than 100-cm radius. References: Alexeef V.A., Malishev V.V. and Labrukhina A.K. (1987) LPSC XVIII, 17-18; Honda M. (1988) Meteoritics 23, 3-12; Honda M. et al (1991) Meteoritics (abstract) 26, 346; Labrukhina A.K. and Gorin V.D. (1985) Meteoritics (abstract) 20, 692; Vogt S. et al. (1991) Meteoritics (abstract) 26, 403.

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