Age and isotopic relationships among the angrites Lewis Cliff 86010 and Angra DOS Reis

Details Age and isotopic relationships among the angrites Lewis Cliff 86010 and Angra DOS Reis Age and isotopic relationships among the angrites Lewis Cliff 86010 and Angra DOS Reis

Apr 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992gecoa..56.1673l&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 56, April 1992, p. 1673-1694. Research supported by Alexander von Humbold

Computer Science

122

Achondrites, Aluminum Isotopes, Radioactive Isotopes, Samarium Isotopes, Strontium Isotopes, Antarctic Regions, Brazil, Mineralogy, Solar Corona, Solar System Evolution

Scientific paper

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.

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