Computer Science
Scientific paper
Mar 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991gecoa..55..829g&link_type=abstract
Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 55, March 1991, p. 829-848.
Computer Science
11
Geochronology, Isotopes, Meteoritic Composition, Petrography, Ureilites, Achondrites, Neodymium Isotopes, Olivine, Pyroxenes, Rubidium Isotopes, Samarium Isotopes, Strontium Isotopes, Meteorites, Ureilites, Isotopic Ratios, Samples, Meteorite, Achondrites, Stony Meteorites, Samarium, Neodymium, Rubidium, Strontium, Oxygen, Classification, Laboratory Studies, Rare Earth Elements, Enrichment, Formation, Age Dating, Age, Parent Material, Chemistry, Petrology, Models, Petrogenesis, Procedure, Mass Spectroscopy,
Scientific paper
The present evaluation of Sm-Nd and Rb-Sr isotopic data for seven ureilites establishes their divisions into three groups on the bases of Sm-Nd isotopic systematics. The first group of ureilites is made up of whole-rock samples whose highly depleted assemblages indicate Sm-Nd model ages consistent with 4.55 Ga. The second group of whole-rock samples of Kenna, Novo Urei, and ALHA77257 are heterogeneous mixtures of an unidentified light REE-enriched component and a light REE-depleted olivine-pyroxene assemblage. In the third group, LEW85440 neither has a model Sm-Nd age of 4.55 Ga nor plots of the 3.74 Ga isochron of the Kenna group; it might have had an evolution similar to the Kenna group, but involving different times and/or isotopic compositions.
Drake Michael J.
Goodrich Cyrena Anne
Jonathan Patchett P.
Lugmair Guenter W.
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