The Estherville mesosiderite - U-Pb, Rb-Sr, and Sm-Nd isotopic study of a polymict breccia

Details The Estherville mesosiderite - U-Pb, Rb-Sr, and Sm-Nd isotopic study of a polymict breccia The Estherville mesosiderite - U-Pb, Rb-Sr, and Sm-Nd isotopic study of a polymict breccia

Apr 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991gecoa..55.1121b&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 55, April 1991, p. 1121-1133.

Computer Science

5

Breccia, Lead Isotopes, Neodymium Isotopes, Rubidium Isotopes, Samarium Isotopes, Strontium Isotopes, Uranium Isotopes, Geochemistry, Radioactive Age Determination, Meteorites, Estherville, Mesosiderites, Isotopic Ratios, Uranium, Lead, Rubidium, Strontium, Samarium, Neodymium, Breccias, Thermal Effects, Stony-Iron Meteorites, Samples, Meteorite, Heterogeneity, Impacts, Age, Silicate, Origin, Formation, Comparisons, Petrology, Chronology, Iron, Metal, Isochrons, Mixing, Laboratory Studies, Heating, Diagrams

Scientific paper

The U-Pb, Rb-Sr, and Sm-Nd isotopic systematics of the Estherville mesoderite were studied using analytical procedures and mass spectrometric techniques similar to those reported by Nakamura et al. (1976), Tatsumoto et al. (1987), and Premo et al. (1989) to analyze 21 separates of a 13-g Estherville clast, obtained either by handpicking or by using density and magnetic separation methods. The results on the Pb-Pb and U-Pb ages (about 4555 and about 4560 Ma, respectively) indicate that at least a part of the Estherville silicate fraction was formed early in the history of solar system. Younger Pb-Pb and U-Pb ages (about 4.43 Ga) were also obtained, confirming the heterogeneity of the Estherville mesoderite that is in agreement with the Wasson and Rubin (1985) suggestion of several generations of meteoritic impacts. The Sm-Nd and Rb-Sr ages were found to be close to 4.56 Ga.

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