Other
Scientific paper
Jun 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979gecoa..43..817g&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 43, June 1979, p. 817-829. Research supported by the Alfred P. Sloan Foundation and Unive
Other
11
Aggregates, Meteoritic Composition, Olivine, Trace Elements, Abundance, Evolution (Development), Inclusions, Planetary Nebulae, Rare Earth Elements, Refractory Materials
Scientific paper
INAA data for Ca, Sc, Hf, La, Ce, Sm, Eu, Tb, Yb, Lu, Os, Ir, Ru, Na, Cl, Br, Fe, Mn, Cr, Co, Au, As, and Sb are presented for ten amoeboid aggregates from the Allende meteorite. Only one lacks olivine. Seven of the remainder, as a group, have cosmic proportions of refractory lithophile and siderophile elements and appear to have formed when coarse-grained Allende inclusion material underwent partial reaction with a low-temperature nebular gas and mixture with FeO-rich olivine. The other two have highly fractionated abundances of refractory elements relative to one another compared to Cl chondrites, including Group II REE patterns, and probably formed by the mixing of fine-grained Allende inclusion material with FeO-rich olivine. Non-refractory siderophile components are also different in composition in each type of amoeboid olivine aggregate.
Davis Aileen M.
Ganapathy Rajesh
Grossman Lawrence
Methot Robert L.
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