Computer Science
Scientific paper
Sep 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987metic..22..179e&link_type=abstract
Meteoritics (ISSN 0026-1114), vol. 22, Sept. 30, 1987, p. 179-190.
Computer Science
3
Allende Meteorite, Calcium Phosphates, Carbonaceous Chondrites, Meteoritic Composition, Rare Earth Elements, Mass Spectroscopy, Neutron Activation Analysis, Phase Transformations
Scientific paper
The Ca-phosphate phases in the Allende CV3 meteorite were selectively dissolved in ammoniacal EDTA solution and measured for abundances of the rare earth elements (REE) by radiochemical neutron activation and mass-spectrometric isotope dilution analyses. The REE abundances in CA-phosphates of Allende are remarkably different from those of ordinary chondrites. All the REE except Eu were observed to be enriched by factors of 50-100 relative to the Cl values. This is 3-4 times lower than concentrations of REE in the ordinary-chondrite phosphates. Allende phosphates have a small positive Eu anomaly, in contrast to the large negative Eu anomaly in phosphates from ordinary chondrites. Though the positive Eu anomaly in Allende Ca-phosphates is puzzling, the lack of a negative Eu anomaly in Allende Ca-phosphates suggests that they never have been in equilibrium with Allende coarse-grained Ca, Al-rich inclusions or their precursor materials.
Ebihara Mitsuru
Honda Masatake
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