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Age and isotopic relationships among the angrites Lewis Cliff 86010 and Angra dos Reis
External Online Source: doi:10.1016/0016-7037(92)90234-A
Author and Affiliation:
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)
Abstract: The 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.
Publication Date: Apr 01, 1992
Document ID:
19920051231
(Acquired Nov 22, 1995)
Accession Number: 92A33855
Subject Category: LUNAR AND PLANETARY EXPLORATION
Document Type: Journal Article
Publication Information: Geochimica et Cosmochimica Acta (ISSN 0016-7037); 56; 1673-169
Publisher Information: United Kingdom
Contract/Grant/Task Num: NAG9-49
Financial Sponsor: NASA; United States
Organization Source: NASA Johnson Space Center; Houston, TX, United States
Description: 22p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: ACHONDRITES; ALUMINUM ISOTOPES; RADIOACTIVE ISOTOPES; SAMARIUM ISOTOPES; STRONTIUM ISOTOPES; ANTARCTIC REGIONS; BRAZIL; MINERALOGY; SOLAR CORONA; SOLAR SYSTEM EVOLUTION
Imprint And Other Notes: Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 56, April 1992, p. 1673-1694. Research supported by Alexander von Humboldt Foundation.
Miscellaneous Notes: Research supported by Alexander von Humboldt Foundation
Availability Source: Other Sources
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