The pore water chemistry of rare earth elements in Buzzards Bay sediments

Details The pore water chemistry of rare earth elements in Buzzards Bay sediments The pore water chemistry of rare earth elements in Buzzards Bay sediments

Nov 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989gecoa..53.2847s&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 53, Issue 11, pp.2847-2856

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10

Scientific paper

A 72 cm deep pore water profile of rare earth elements (REE) is presented from Buzzards Bay sediments. This profile shows large enrichments of all REE in the upper half followed by the preferential removal of light and middle REE in the lower part of the core. As such, this study (1) confirms the observations of and (1987) from a 30 cm profile that REE undergo active diagenesis in Buzzards Bay sediments and (2) provides new data to show that removal and fractionation occur upon further burial and diagenesis. In the upper half of the core, the diagenetic input of REE into pore waters is accompanied by the preferential release of light REE (LREE) and middle REE (MREE) relative to heavy REE (HREE). At their maxima near 40 cm, pore water concentrations reach values 10-20 times (30 times for Ce) those of bottom water. Between 40 and 70 cm, the concentrations of La through Gd decrease by 50% while Er and Yb decrease by only 25% and Lu shows no decrease. Hence both the production and removal of REE results in significant fractionation. Positive Ce anomalies are restricted to the upper 9 cm; at greater depths the Ce profile tracks that of other trivalent neighbors (La, Nd). A mild leach of sediments with 0.3 M HCl showed that a large fraction of REE and P are released (30-40% and 60%, respectively) to solution while the percentage was only 4% for Al. While phosphatic phases are important carriers of REE in marine sediments, their link to diagenesis and pore water chemistry remains to be solved.

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