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Exposure ages of carbonaceous chondrites, 1The recent exposure histories of carbonaceous chondrites have been investigated using cosmogenic radionuclides. Our results may indicate a clustering of exposure ages of C1 and C2 chondrites into two peaks, 0.2 My and 0.6 My, perhaps implying two collisional events of Earth-crossing parent bodies. Among carbonaceous chondrites are some having short exposure ages which Mazor et al. hypothesized cluster into a small number of families. This hypothesis is based on spallogenic Ne-21 exposure ages, which in some instances are difficult to determine owing to the large amounts of trapped noble gases in carbonaceous chondrites. Also, since Ne-21 is stable, it integrates a sample's entire exposure history, so meteorites with complex exposure histories are difficult to understand using exclusively Ne-21. Cosmogenic radionuclides provide an alternative means of determining the recent cosmic ray exposure duration. To test the hypothesis of Mazor et al. we have begun a systematic investigation of exposure histories of Antarctic and non-Antarctic carbonaceous chondrites especially C2s.
Document ID
Document Type
Conference Paper
Nishiizumi, K. (California Univ. Berkeley, CA, United States)
Arnold, J. R. (California Univ. San Diego, La Jolla., United States)
Caffee, M. W. (Lawrence Livermore National Lab. CA., United States)
Finkel, R. C. (Lawrence Livermore National Lab. CA., United States)
Southon, J. R. (Lawrence Livermore National Lab. CA., United States)
Nagai, H. (Nihon Univ. Tokyo, Japan)
Honda, M. (Nihon Univ. Tokyo, Japan)
Sharma, P. (Rochester Univ. NY., United States)
Imamura, M. (Tokyo Univ. Japan)
Kobayashi, K. (Tokyo Univ. Japan)
Date Acquired
September 6, 2013
Publication Date
January 1, 1993
Publication Information
Publication: Lunar and Planetary Inst., Twenty-Fourth Lunar and Planetary Science Conference. Part 3: N-Z
Subject Category
Distribution Limits
Work of the US Gov. Public Use Permitted.

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