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Identification of Natural and Anthropogenic Contributions to Heavy Metal Enrichments in Great Lakes Sediments

机译：大湖沉积物中重金属富集的自然和人为贡献的识别

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Surficial sediment samples were collected at 47 stations in Little Traverse Bay, Lake Michigan, to determine the geochemical associations between certain rare earth elements (REE's) and trace metals. Each sample was analyzed for carbonate carbon, organic carbon, grain size and the elements Al, Ca, Ce, Co, Cr, Eu, Re, Hf, La, and Mn. Two distinct Ce subpopulations were identified by graphical analysis, and an R-mode factor analysis was applied to data from the 'enriched' Ce subpopulation (18 samples). Results show that the REE's and trace metals are primarily enriched in the authigenic phase of these sediments. Partial correlation analyses indicate that the REE's are primarily associated with hydrous Fe oxides relative to organic matter in this phase. The ration of Ce/La concentrations increased markedly from the bay margins to the central trough of the bay, indicating that Ce, similar to Fe, exhibits a variable oxidation state in the authigenic phase of nearshore fine-grained sediments. Our results suggest that the REE's and trace metals behave coherently in the authigenic phase of recent lacustrine sediments, and the REE's may be useful as geochemical tracers to differentiate between trace metal enrichments in surface sediments due to diagenesis and pollution loadings.

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