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Detailed Reference Information |
Ferko, T.E., Wang, M.-S. and Lipschutz, M.E. (2002). Chemical studies of H chondrites 11. Cosmogenic radionuclides in falls. Journal of Geophysical Research 107: doi: 10.1029/2001JE001527. issn: 0148-0227. |
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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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Abstract |
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Keywords
Planetology, Solar System Objects, Meteorites and tektites, Planetology, Solar System Objects, Asteroids and meteoroids, Interplanetary Physics, Cosmic rays |
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Publisher
American Geophysical Union 2000 Florida Avenue N.W. Washington, D.C. 20009-1277 USA 1-202-462-6900 1-202-328-0566 service@agu.org |
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