Two forsterite-bearing FUN inclusions in the Allende meteorite

Details Two forsterite-bearing FUN inclusions in the Allende meteorite Two forsterite-bearing FUN inclusions in the Allende meteorite

Mar 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984gecoa..48..533c&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 48, March 1984, p. 533-548.

Computer Science

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Carbonaceous Chondrites, Chemical Fractionation, Forsterite, Inclusions, Isotopic Enrichment, Magnesium Isotopes, Meteoritic Composition, Crystallization, Microphotographs, Petrology, Silicon Isotopes

Scientific paper

Two forsterite-, fassaite-, spinel-rich inclusions in Allende which share common mineralogy and texture with three previously described inclusions are described. These inclusions were at least partially molten at temperatures over 1400 C, and their crystallization sequence was spinel, olivine, fassaite, and Mg-rich melilite. At least some of them experienced partial volatilization of MgO and SiO2 from their outer margins. At least one of the inclusions is highly enriched in MgO relative to CaO and Al2O3 compared to Allende coarse-grained inclusions, although it is just as strongly enriched in refractory trace elements as the latter, relative to C1 chondrites. Two of the objects are FUN inclusions on the basis of their oxygen, magnesium, and silicon isotopic compositions.

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