Noble gas record, collisional history and pairing of CV, CO, CK and other carbonaceous chondrites

Details Noble gas record, collisional history and pairing of CV, CO, CK and other carbonaceous chondrites Noble gas record, collisional history and pairing of CV, CO, CK and other carbonaceous chondrites

Jan 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000m%26ps...35..145s&link_type=abstract

Meteoritics & Planetary Science, vol. 35, no. 1, pp. 145-153 (2000).

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Concentration and isotopic composition of the light noble gases as well as of 84Kr, 129Xe, and 132Xe have been measured in bulk samples of 60 carbonaceous chondrites, 45 were measured for the first time. Solar noble gases were found in 9 specimens (Arch, Acfer 094, Dar al Gani 056, GRA 95229, Grosnaja, Isna, PRE 95404, Y 86009 and Y 86751). These meteorites are thus regolith breccias. CV and CO chondrites contain abundant planetary-type noble gases, but not CK chondrites. A characteristic feature of CK chondrites are high 129Xe/132Xe ratios. The petrologic type of carbonaceous chondrites is correlated with the concentration of trapped heavy noble gases, similar as observations have shown for ordinary chondrites. However, this correlation is disturbed for several meteorites due to a contribution of atmospheric noble gases, an effect correlated to terrestrial weathering effects. Cosmic-ray exposure ages are calculated from cosmogenic 21Ne. They range from about 1 Ma to 63.5 Ma for CO, CV and CK classes which is longer than exposure ages reported for CM and CI chondrites. Only the CO3 chondrite Isna has an exceptionally low exposure age of 0.15 Ma. No dominant clusters are observed in the cosmic-ray exposure age distribution, only for CV and CK chondrites potential peaks seem to develop at ~ 9 Ma and ~ 29 Ma. Several pairings among the chondrites from hot deserts are suggested but 52 of the 60 investigated meteorites are individual falls.

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