Other
Scientific paper
Nov 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977gecoa..41.1587n&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 41, Nov. 1977, p. 1587-1600.
Other
12
Abundance, Meteoritic Composition, Minerals, Rare Earth Elements, Trace Elements, Crystallography, Granular Materials, Inclusions, Magnesium Isotopes, Pyroxenes, Spinel
Scientific paper
Concentrations of the rare earth elements (REE), Sc, Co, Fe, Zn, Ir, Na, and Cr were determined for mineral separates of the coarseand fine-grained types (group I and II) of the Allende inclusions. These data in combination with other data suggest that the minerals in the coarse-grained inclusions (group I) crystallized in a closed system with respect to refractory elements although a totally molten stage is precluded. The data also indicate that fine-grained (group II) inclusions were formed by condensation from a super-cooled nebular gas; REE-rich clinopyroxene and spinel were formed earlier than REE-poor sodalite and nepheline. In addition, pre-existing Mg isotope anomalies in the coarse-grained inclusions must have been erased during the heating stage.
Blanchard Douglas P.
Brannon Joyce C.
Jacobs Jeffrey W.
Nagasawa Hiroshi
Onuma Naoki
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