Rare earth elements in the pore waters of reducing nearshore sediments

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doi: 10.1016/0012-821X(87)90202-0
Authors:Elderfield, H.; Sholkovitz, E. R.
Author Affiliations:Primary:
Univ. Cambridge, Dep. Earth Sci., Cambridge, United Kingdom
Woods Hole Oceanogr. Inst., United States
Volume Title:Earth and Planetary Science Letters
Source:Earth and Planetary Science Letters, 82(3-4), p.280-288. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0012-821X
Publication Date:1987
Note:In English. Cambridge Earth Sci.; Contrib. No. 848. 32 refs.; illus. incl. 3 tables
Summary:REE are mobile during early diagenesis in reducing nearshore sediments of Buzzards Bay, Massachusetts, leading to greatly enhanced concentrations in pore waters, e.g. Nd 815 and Ce 1910 pmol/kg within 30 cm of the sediment/sea-water interface, approx 10-50 times local sea-water values. Two principal diagenetic reactions were identified. Preferential Ce enrichment (positive Ce anomalies) and preferential HREE enrichment (LREE removal) in the pore waters is associated with redox cycling of Fe and Mn within the upper few cm of the sediment. Release of REE, without fractionation, from sediments and addition to pore waters occurs deeper within the sediment column. The impact on the bulk sediment chemistry is undetectable, but the pore water gradients imply that there are significant dissolved REE fluxes, both internal to the sediment system and across the sediment/sea-water interface. [P.Br.]
Subjects:Anaerobic environment; Cores; Diagenesis; Early diagenesis; Geochemistry; Marine environment; Marine sediments; Metals; Mobility; Nearshore environment; Pore water; Rare earths; Reduction; Sediments; Trace elements; Atlantic Ocean; Buzzards Bay; Massachusetts; United States; North American Atlantic
Abstract Numbers:87M/6325
Record ID:1987077745
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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