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Title: Age and isotopic relationships among the angrites Lewis Cliff 86010 and Angra dos Reis

Results of a wide-ranging isotopic investigation of the unique Antarctican angrite LEW-86010 (LEW) are presented, together with a reassessment of the type angrite Angra dos Reis (ADOR). The principal objectives of this study are to obtain precise radiometric ages, initial Sr isotopic compositions, and to search for the erstwhile presence of the short-lived nuclei {sup 146}Sm and {sup 26}Al via their daughter products. The isotopic compositions of Sm, U, Ca, and Ti were also measured. This allows a detailed appraisal to be made of the relations between, and the genealogy of, these two angrites.
Authors:
 [1] ;  [2]
  1. (Univ. of California, San Diego, La Jolla (United States))
  2. (Univ. of California, San Diego, La Jolla (United States) Max-Planck-Inst. fuer Chemie, Mainz (West Germany))
Publication Date:
OSTI Identifier:
5299092
Resource Type:
Journal Article
Resource Relation:
Journal Name: Geochimica et Cosmochimica Acta; (United States); Journal Volume: 56:4
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; PYROXENES; CHEMICAL COMPOSITION; STONE METEORITES; ISOTOPE DATING; MINERALOGY; ALUMINIUM 26; CLASSIFICATION; COMPARATIVE EVALUATIONS; GEOCHEMISTRY; ISOTOPE RATIO; PETROGENESIS; SAMARIUM 146; STRONTIUM ISOTOPES; AGE ESTIMATION; ALKALINE EARTH ISOTOPES; ALPHA DECAY RADIOISOTOPES; ALUMINIUM ISOTOPES; BETA DECAY RADIOISOTOPES; BETA-PLUS DECAY RADIOISOTOPES; CHEMISTRY; EVALUATION; EVEN-EVEN NUCLEI; INTERMEDIATE MASS NUCLEI; ISOTOPES; LIGHT NUCLEI; METEORITES; MINERALS; NUCLEI; ODD-ODD NUCLEI; OXYGEN COMPOUNDS; RADIOISOTOPES; RARE EARTH ISOTOPES; RARE EARTH NUCLEI; SAMARIUM ISOTOPES; SECONDS LIVING RADIOISOTOPES; SILICATES; SILICON COMPOUNDS; YEARS LIVING RADIOISOTOPES 580000* -- Geosciences