Demonstration of REE fractionation among individual chondrules from the Allende (CV3) chondrite

Details Demonstration of REE fractionation among individual chondrules from the Allende (CV3) chondrite Demonstration of REE fractionation among individual chondrules from the Allende (CV3) chondrite

Jun 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988gecoa..52.1699m&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 52, June 1988, p. 1699-1710. Research supported by Okayama University and

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10

Abundance, Allende Meteorite, Fractionation, Meteoritic Composition, Petrography, Rare Earth Elements, Mass Spectroscopy, Olivine, Pyroxenes

Scientific paper

This paper reports on the results of accurate analysis of REE and other trace elements in 24 chondrules from the Allende (CV3) chondrite, using improved isotope dilution techniques. The REE abundances, normalized to the Orgueil CI chondirite, were found to be 2.5-10 x CI for barred olivine chondrules, 2-8 x CI for porphyritic and nonporphyritic pyroxene chondrules, and 0.15-4 x CI for porphyritic olivine and porphyritic olivine-pyroxene chondrules. General REE fractionations and large (up to 170-percent) anomalies of Ce, Eu, and Yb were found in all chondrule types, particularly in barred olivine and pyroxene-rich chondrules. Positive correlations of REE with K and Rb as well as with Ca, Sr, and Ba were found, independent of textural type and major chemical compositions; each type of chondrule had large and systematic abundance variations of K and Rb, but a constant K/Rb ratio close to that of CIs. These results were used to draw constraints on the chemical characteristics of precursors and chondrule-forming events.

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