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Cosmogenic Records in 18 Ordinary Chondrites from the Dar Al Gani Region, LibyaIn the past decade more than 1000 meteorites have been recovered from the Dar al Gani (DaG) plateau in the Libyan part of the Sahara. The geological setting, meteorite pairings and density are described. So far, only a few terrestrial ages are known for DaG meteorites, e.g. 60+/- 20 kyr for the DaG 476 shergottite shower and 80+/- 20 kyr for the lunar meteorite DaG 262. However, from other desert areas, such as Oman, it is known that achondrites may survive much longer than chondritic meteorites, so the ages of these two achondrites may not be representative of the majority of the DaG meteorite collection, of which more than 90% are ordinary chondrites. In this work we report concentrations of the cosmogenic radionuclides, 14C (half-life = 5,730 yr), 41Ca (1.04x10 superscript 5 yr), Cl-36 (3.01x10 superscript 5 yr), Al-26 (7.05x10 superscript 5 yr) and 10Be (1.5x10 superscript 6 yr) to determine the terrestrial ages of DaG meteorites and constrain their pre-atmospheric size and exposure history.
Document ID
20030111554
Document Type
Conference Paper
Authors
Welten, K. C. (California Univ. Berkeley, CA, United States)
Nishiizumi, K. (California Univ. Berkeley, CA, United States)
Finkel, R. C. (Lawrence Livermore National Lab. Livermore, CA, United States)
Hillegonds, D. J. (Lawrence Livermore National Lab. Livermore, CA, United States)
Jull, A. J. T. (National Science Foundation Tucson, AZ, United States)
Schultz, L. (Max-Planck-Inst. fuer Chemie Mainz, Germany)
Date Acquired
August 21, 2013
Publication Date
January 1, 2003
Publication Information
Publication: Lunar and Planetary Science XXXIV
Subject Category
Lunar and Planetary Science and Exploration
Funding Number(s)
CONTRACT_GRANT: W-7405-eng-48
CONTRACT_GRANT: NAG5-4992
Distribution Limits
Public
Copyright
Public Use Permitted.

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IDRelationTitle20030110578Analytic PrimaryLunar and Planetary Science XXXIV
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