Chemical studies of H chondrites 11. Cosmogenic radionuclides in falls

Details Chemical studies of H chondrites 11. Cosmogenic radionuclides in falls Chemical studies of H chondrites 11. Cosmogenic radionuclides in falls

Oct 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002jgre..107.5077f&link_type=abstract

Journal of Geophysical Research (Planets), Volume 107, Issue E10, pp. 7-1, CiteID 5077, DOI 10.1029/2001JE001527

Physics

Planetology: Solar System Objects: Meteorites And Tektites, Planetology: Solar System Objects: Asteroids And Meteoroids, Interplanetary Physics: Cosmic Rays

Scientific paper

We measured the long-lived cosmogenic radionuclides 10Be, 26Al, and 36Cl in 47 H chondrite falls: 13 ``Cluster 1'' members, 9 ``Cluster 5'' members, and 25 random falls. From the date and time of fall, Clusters 1 and 5 were previously identified as possible coorbital meteoroid streams with distinctive thermal histories being confirmed by contents of volatile trace elements. Here, we use model data, including a three-radionuclide plot (10Bebulk/26Albulk versus 36Clmetal/26Albulk) and the multivariate statistical techniques of logistic regression and linear discriminant analysis to compare radionuclide levels and their utility to differentiate specific suites from other H chondrites. From our radionuclide results and from noble gas data from other workers, we identified 35 falls with simple irradiation histories and cosmic ray exposure ages >4 Ma. Eight others exhibit evidence for shorter (<=4 Ma) exposure, three of which had complex exposure histories (two having been reported by others previously); three others may have had such a history. In any event, the small proportion of H chondrite falls with complex exposure histories supports recent suggestions that they are not commonly encountered, as earlier workers suggested. Although cosmogenic radionuclides do not differentiate between Cluster 1 and a random set of H chondrites, H chondrites that lost 3He from solar heating are distinguishable from those with normal 3He levels.

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