Rare earth element geochemistry and the "tetrad" effect

Details Rare earth element geochemistry and the "tetrad" effect Rare earth element geochemistry and the "tetrad" effect

May 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994gecoa..58.2025m&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 58, Issue 9, pp.2025-2033

Mathematics

Logic

6

Scientific paper

The "tetrad" effect is found in the rare earth elements (La-Lu) and results from increased stability at quarter, half, three-quarter, and complete filling of the 4f electron shell. Suggestions that this effect is observed in REE patterns of seawater and other geological samples (marine phases, the mineral kimuraite, late stage granitic rocks, the mineral uraninite, and siliciclastic sediments) are not compelling. In the cases of seawater and the carbonate mineral kimuraite, a discontinuity at Gd may be attributed to the "tetrad" effect but the complexity of the overall controls on these REE distributions leaves such an interpretation uncertain at best. Unusual REE patterns in leucogranites and pegmatites are best explained by fractionation of trace minerals, notably apatite. Apparent "tetrad" anomalies in uraninite REEs disappear when normalised to upper crustal (i.e., shale) abundances. Analytical difficulties probably explain apparent "tetrad" effects in some seawater, limestone, and siliciclastic REE patterns.

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