The evolution of complex type B Allende inclusion - an ion microprobe trace element study

Details The evolution of complex type B Allende inclusion - an ion microprobe trace element study The evolution of complex type B Allende inclusion - an ion microprobe trace element study

Sep 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989gecoa..53.2413m&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 53, Sept. 1989, p. 2413-2427.

Computer Science

7

Allende Meteorite, Inclusions, Meteoritic Composition, Rare Earth Elements, Trace Elements, Chemical Composition, Chondrites, Ion Probes, Mineralogy, Spinel, Meteorites, Inclusions, Allende, Cv3 Chondrites, Rare Earth Elements, Microprobe Methods, Trace Elements, Evolution, Refractory Material, Samples, Meteorite, Laboratory Studies, Origin, Fractional Crystallization, Procedure, Diagrams, Melilite, Mantle, Core, Spinel, Isotopes, Description, Composition, Models, Melt, Xenoliths, Volatilization

Scientific paper

Results are presented of a detailed trace-element and isotopic analyses of the constituent phases in each of the major textural parts (mantle, core, and islands) of a Type B refractory inclusion, the USNM 5241 inclusion from Allende, first described by El Goresy et al. (1985). The REE data on 5241 were found to be largely consistent with a model in which the mantle and the core of 5241 formed sequentially out of a single melt by fractional crystallization. The numerical models of REE evolution in the 5241 melt, especially that of Eu, require that a significant mass of spinel-free island material was assimilated into the evolving melt during the last half of the solidification history of 5241. The trace element results obtained thus strongly support the interpretation of El Goresy et al. (1985) that the spinel-free islands in the 5241 are trapped xenoliths.

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