CE anomalies in the LEW85300 eucrite - Evidence for REE mobilization during Antarctic weathering

Mathematics – Logic

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Antarctic Regions, Cerium, Meteoritic Composition, Rare Earth Elements, Weathering, Anomalies, Europium, Mass Spectroscopy

Scientific paper

SIMS is used to investigate the microdistribution of Ce anomalies in the Antarctic polymict eucrite LEW85300. Ce anomalies are present in all three of the minerals (plagioclase, pyroxene, and silica) analyzed. The anomalies occur in grains from all four clasts as well as in mineral and lithic fragments from the surrounding matrix; thus there apears to be no lithologic association. Silica exhibits a LREE-enriched pattern with negative Ce and Eu anomalies, consistent with a derivation of the REE from a Ca-phosphate dissolution: trivalent REE are leached from the phosphates, with preferential retention of tetravalent Ce, and redeposited on silica. Pyroxene is also widely affected by REE mobilization, due to an extensive, shock-induced microcrack network along cleavage planes. A tendency for the largest Ce anomalies to occur at low LREE concentrations suggests that pyroxene itself experienced REE leaching with concomitant Ce retention.

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