Mineralogy and petrography of HAL, an isotopically-unusual Allende inclusion

Details Mineralogy and petrography of HAL, an isotopically-unusual Allende inclusion Mineralogy and petrography of HAL, an isotopically-unusual Allende inclusion

May 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980gecoa..44..685a&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 44, May 1980, p. 685-699. Research supported by the Alfred P. Sloan Research Foundation, N

Mathematics

Logic

6

Isotope Effect, Meteoritic Composition, Mineralogy, Petrography, Abundance, Aluminum Oxides, Geochemistry, Inclusions, Iron Oxides, Single Crystals, Solar Corona, Trace Elements, Meteorites, Allende Meteorite, Mineralogy, Petrography, Inclusions, Origin, Isotopic Composition, Isotopic Ratios, Magnesium, Aluminum, Composition, Iron, Calcium, Oxides, Matrix, Layers, Olivines, Pyroxenes, Chemistry, Crystals, Techniques, Textures, Hibonite, Friability, Photographs, Distribution, Abundance, Fractionation, Conden

Scientific paper

Results of a detailed mineralogical and textural study of the HAL (Hibonite ALlende) inclusion of the Allende meteorite, which has been found to exhibit no Mg-26 excesses despite very high Al-27/Mg-24 ratios and large fractionation effects with small nuclear effects in its Ca, are reported. The inclusion is found to consist of three up to 1-mm diameter hibonite crystals partially surrounded by a black rim resembling a devitrified glass and containing an anisotropic Al-Fe oxide, which is in turn surrounded by a 2-mm thick friable rim sequence consisting of five layers distinguishable by mineral composition. From the available evidence, it is concluded that each of the layers of the friable rim formed by the accretion of an assemblage of condensate grains rather than by the complete reaction of a HAL precursor with a nebular gas, thus explaining its unusual isotopic characteristics and supporting the conclusion that the solar nebular contained isotopically-distinct reservoirs.

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