Cosmogenic radionuclides and noble gases in Antarctic H chondrites with high and normal natural thermoluminescence levels

Details Cosmogenic radionuclides and noble gases in Antarctic H chondrites with high and normal natural thermoluminescence levels Cosmogenic radionuclides and noble gases in Antarctic H chondrites with high and normal natural thermoluminescence levels

Jul 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000m%26ps...35..713m&link_type=abstract

Meteoritics & Planetary Science, vol. 35, no. 4, pp. 713-721 (2000).

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We report noble gas data for 37 H chondrites collected from the Allan Hills by EUROMET in the 1988/1989 Field Season. Among these are 16 specimens with high levels (>100 krad) of natural thermoluminescence (NTL), originally interpreted as signaling their derivation from a single meteoroid with an orbit that became Earth-crossing -~100 ka ago. One of these 16 is an H3 with a cosmic ray exposure age of ~33 Ma and clearly represents a separate fall. The other 15 H4-6 chondrites derive from 3 separate meteoroids, each of which is represented by a 5- or 6-member group. These groups have mean exposure ages of 3.7, 4.1 and 6.6 Ma: the middle-group members all contain solar Ne. The 2 younger groups also seem to each include a few H chondrites with normal NTL levels. Measurements of cosmogenic 10Be (1.5 Ma), 26Al (710 ka) and 36Cl (301 ka) in 14 of the high NTL chondrites indicate that all reflect a simple irradiation history. In contrast, many of a different, 38-member, randomly-selected suite of Antarctic H chondrites seem to have different cosmic ray irradiation histories. The 3.7 and 6.6 Ma groups from the 37-member Allan Hills suite come, respectively, from about 5-30 cm and about 5-10 cm depths in 80-125 cm and 60-125 cm-radius meteoroids.

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