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Age and isotopic relationships among the angrites Lewis Cliff 86010 and Angra dos ReisThe paper presents results of a wide-ranging isotopic investigation of the the Antarctic angrite LEW-86010 (LEW), and reassesses the type angrite Angra dos Reis (ADOR) in order to obtain precise radiometric ages and initial Sr isotopic compositions, and to search for the erstwhile presence of the short-lived nuclei Sm-146 and Al-26 via their daughter products. The isotopic compositions of Sm, U, Ca, and Ti were measured to allow a detailed appraisal to be made of the relations between, and the geneology of, these two angrites. LEW proves to be severely contaminated with modern terrestrial Pb, which is shown to result from terrestrial weathering. Concordant Pb-Pb model ages of pyroxene separates are obtained; uranium isotopic compositions are normal within error. Overall, striking age and isotopic similarities between LEW and ADOR were found, suggesting almost simultaneous production on the same asteroid, even though recent experimental studies imply that the two are not comagmatic.
Document ID
19920051231
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Lugmair, G. W.
(Scripps Institution of Oceanography La Jolla, CA, United States)
Galer, S. J. G.
(Scripps Institution of Oceanography, La Jolla, CA; Max-Planck-Institut fuer Chemie, Mainz Federal Republic of Germany, United States)
Date Acquired
August 15, 2013
Publication Date
April 1, 1992
Publication Information
Publication: Geochimica et Cosmochimica Acta
Volume: 56
ISSN: 0016-7037
Subject Category
Lunar And Planetary Exploration
Accession Number
92A33855
Funding Number(s)
CONTRACT_GRANT: NAG9-49
Distribution Limits
Public
Copyright
Other

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