Rare earth element geochemistry of oceanic ferromanganese nodules and associated sediments

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doi: 10.1016/0016-7037(81)90184-8
Authors:Elderfield, H.; Hawkesworth, C. J.; Greaves, M. J.; Calvert, S. E.
Author Affiliations:Primary:
Univ. Leeds, Dep. Earth Sci., Leeds LS2 9JT, United Kingdom
Volume Title:Geochimica et Cosmochimica Acta
Source:Geochimica et Cosmochimica Acta, 45(4), p.513-528. Publisher: Pergamon, Oxford, International. ISSN: 0016-7037
Publication Date:1981
Note:In English. 2 p. refs.; illus. incl. 5 tables
Summary:Analyses have been made of RE contents of a well-characterized suite of deep-sea (>4000 m) principally todorokite-bearing ferromanganese nodules and associated sediments from the Pacific Ocean. RE in nodules and their sediments are closely related; nodules with the largest positive Ce anomalies are found on sediments with the smallest negative Ce anomalies; in contrast, nodules with the highest contents of trivalent RE are found on sediments with the lowest trivalent RE contents and vice versa. 143Nd/144Nd ratios in the nodules (approx 0.51244) point to an original sea-water source, but an identical ratio for sediments in combination with the RE patterns suggests that diagenetic reactions may transfer elements into the nodules. Inter-element relationships and leaching tests suggest that RE contents are controlled by a P-rich phase with a RE pattern similar to that for biogenous apatite, and a Fe-rich phase with a pattern the mirror image of that for sea-water. Ce appears to be added both to nodules and sediments directly from sea-water and is not involved in diagenetic reactions. [C.M.B.H.]
Subjects:Composition; Deep-sea environment; Diagenesis; Ferromanganese composition; Geochemistry; Iron; Isotopes; Marine environment; Marine sediments; Metals; Minor elements; Nd-144/Nd-143; Neodymium; Nodules; Partition coefficients; Rare earths; Sediments; Stable isotopes; Fractionation
Abstract Numbers:82M/2963
Record ID:1982046422
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom, Reference includes data from PASCAL, Institute de l'Information Scientifique et Technique
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