Generation of abnormal trace element abundances in Antarctic eucrites by weathering processes

Details Generation of abnormal trace element abundances in Antarctic eucrites by weathering processes Generation of abnormal trace element abundances in Antarctic eucrites by weathering processes

Jan 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991gecoa..55...77m&link_type=abstract

(Workshop on Differences between Antarctic and non-Antarctic Meteorites, Vienna, Austria, July 27, 28, 1989) Geochimica et Cosmo

Computer Science

25

Antarctic Regions, Meteoritic Composition, Rare Earth Elements, Trace Elements, Weathering, Basalt, Cerium, Europium, Geochemistry, Petrology, Meteorites, Antarctic Meteorites, Trace Elements, Abundance, Weathering, Eucrites, Achondrites, Anomalies, Rare Earth Elements, Patterns, Cerium, Europium, Lew Meteorites, Lew 85300, Lew 85302, Lew 85303, Composition, Samples, Meteorite, Procedure, Analysis, Catalog, Alh Meteorites, Eet Meteorites, Pca Meteorites, Til Meteorites, Trace Elements, Selenium, Major Eleme

Scientific paper

Data were obtained on the trace- and major-element compositions of 16 Antarctic abnormal eucrites, many of which exhibiting positive (but sometimes negative) Ce anomalies, positive Eu anomalies, and low abundances of the remainder of the REEs. The results of data analysis suggest that the unusual REE patterns of abnormal Antarctic eucrites arise from weathering effects generated in or on the Antarctic ice. The suggested scenario involves the formation of melt water and its equilibration with the atmosphere, promoting the dissolution of REE-rich phosphates and the oxidation of Ce. As a result, tetravalent Ce is fractionated from the trivalent REE in solution.

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