Alkali (Rb/K) abundances in Allende barred-olivine chondrules - Implications for the melting conditions of chondrules

Details Alkali (Rb/K) abundances in Allende barred-olivine chondrules - Implications for the melting conditions of chondrules Alkali (Rb/K) abundances in Allende barred-olivine chondrules - Implications for the melting conditions of chondrules

Jun 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990metic..25..137m&link_type=abstract

Meteoritics (ISSN 0026-1114), vol. 25, June 1990, p. 137-143.

Computer Science

4

Abundance, Chondrule, Melts (Crystal Growth), Meteoritic Composition, Olivine, Potassium Compounds, Rubidium Compounds, Alkaline Earth Compounds, Isotopes, Mass Spectrometers, Vaporizing, Meteorites, Alkali, Abundance, Chondrules, Melting, Rubidium, Olivine, Potassium, Laboratory Studies, Mass Spectrometry, Cv3 Chondrites, Origin, Chondrites, Stony Meteorites, Alkaline Earth Metals, Element Ratios, Depletion, Calcium, Formation, Reduction, Fractionation, Procedure, Melting, Petrography, Vaporization

Scientific paper

Twenty five petrographically characterized chondrules, including 18 barred olivine (BO) chondrules from the Allende (CV3) meteorite, were analyzed for alkalis (K and Rb) and alkaline earths (Sr, Ba, Ca and Mg) by mass spectrometric isotope dilution. Most BO chondrules with higher alkalis (greater than the CI level) have nearly CI-chondritic Rb/K ratios, while those with lower alkalis clearly show higher Rb/K ratios than the CI-chondritic. In general, BO chondrules with higher Rb/K exhibit more depletion of alkalis relative to Ca. The mean olivine Fa for individual chondrules positively correlates with bulk alkali concentrations in BO type but not in porphyritic type chondrules. These observations suggest that some BO chondrules formed from more reducing assemblages of precursor minerals, which experienced more intensive vaporization losses of alkalis, accompanied by Rb/K fractionation, during the chondrule-formation melting.

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