Hibonite-bearing microspherules - A new type of refractory inclusions with large isotopic anomalies

Details Hibonite-bearing microspherules - A new type of refractory inclusions with large isotopic anomalies Hibonite-bearing microspherules - A new type of refractory inclusions with large isotopic anomalies

Jan 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991gecoa..55..367i&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 55, Jan. 1991, p. 367-379.

Computer Science

29

Inclusions, Petrography, Refractory Materials, Spherules, Trace Elements, Calcium Isotopes, Geochemistry, Magnesium Isotopes, Rare Earth Elements, Silica Glass, Titanium Isotopes, Meteorites, Hibonite, Spherules, Inclusions, Refractory Material, Lance, Isotopes, Anomalies, Petrography, Composition, Samples, Meteorite, Laboratory Studies, Major Elements, Trace Elements, Chemistry, Hypotheses, Magnesium 26, Calcium 48, Titanium 50, Silicate, Glasses, Depletion, Co3 Chondrites, Chondrites, Stony Meteorites, Cm

Scientific paper

This paper presents petrographic description as well as results on the major- and trace-element chemistry and on Mg, Ca, and Ti isotopic compositions of three refractory inclusions, including 3413-1/31 inclusion from Lance and Murchison 7-228 and 7-753, the mineralogy of which is dominated by the oxide minerals spinel, hibonite, and perovskite. The microspherules examined seem to constitute a separate class of refractory inclusions, characterized by a distinct morphology and mineralogy; large excesses of Ca-48 and Ti-50, and Mg-26 depletions. It is suggested that this type of inclusions must have formed early, prior to the dilution of isotopic anomalies by mixing processes, and in an area characterized by excesses of Ca-48 and Ti-50, depletions of Mg-26, and a lack of Al-26.

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