Trace element and petrologic clues to the formation of forsterite-bearing Ca-Al-rich inclusions in the Allende meteorite

Details Trace element and petrologic clues to the formation of forsterite-bearing Ca-Al-rich inclusions in the Allende meteorite Trace element and petrologic clues to the formation of forsterite-bearing Ca-Al-rich inclusions in the Allende meteorite

Mar 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987gecoa..51..607w&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 51, March 1987, p. 607-622. Research supported by the Australian Research

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Allende Meteorite, Aluminum Compounds, Calcium Compounds, Forsterite, Petrology, Trace Elements, Chemical Fractionation, Crystallization, Earth Mantle, Electron Probes, Neutron Activation Analysis, Oxidation, Meteorites, Allende, Stony Meteorites, Carbonaceous Chondrites, Petrology, Cv3 Chondrites, Trace Elements, Formation, Fosterite, Cais, Inclusions, Samples, Meteorite, Patterns, Crystallization, Laboratory Studies, Rims, Residue, Evaporation, Refractory Material, Lithophiles, Fractionation, Temperature,

Scientific paper

This work presents new trace element and petrographic data for three forsterite-bearing, Ca-Al-rich inclusions from the Allende meteorite: TE, 818a, and 110-A. Such inclusions form a continuum with Type B1 and B2 Ca-Al-rich inclusions (CAIs), and the authors refer to them as "Type B3" CAIs. Textures, mineral chemistries, crystal-chemically fractionated REE patterns, and other properties suggest that Type B3 crystallized from partly molten evaporative residues. They also present evidence that 818a was strongly re-heated and modified in the nebula after its initial crystallization: it consists of a core of coarse-grained Ti-Al-pyroxene (Tpx), forsterite, spinel and metal grains and a thick, surrounding mantle of melilite.

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