Computer Science
Scientific paper
Jun 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993e%26psl.117..671m&link_type=abstract
Earth and Planetary Science Letters, Volume 117, Issue 3-4, p. 671-676.
Computer Science
6
Scientific paper
The distribution of rare-earth elements has been studied for aerobic, alkaline (pH 9.6), carbonate-rich waters from Lake Van, Turkey. Shale-normalized REE (REESN) patterns display an almost linear increase from the light to the heavy REEs and strong positive CeSN anomalies. There exist neither positive nor negative GdSN anomalies. The REESN patterns are consistent with domination of REE speciation in solution by (poly)carbonato-complexes, generating enrichment of the heavy REEs that is even more pronounced than that seen in seawater. This is the first report of positive CeSN anomalies observed in REESN patterns of aerobic natural waters. These anomalies apparently result from stabilization of (penta)carbonato-CeIV-complexes in solution, leading to enhanced abundances of Ce in comparison with its trivalent REE neighbours. Thus, in remarkable contrast to seawater, positive CeSN anomalies may be general features of alkaline, carbonate-rich and aerobic lake waters.
Bau Michael
Moller Peter
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