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Rare earth element studies of surficial sediments from the southwestern Carlsberg Ridge,Indian Ocean
Authors:J N Pattan  N C Higgs
Institution:(1) National Institute of Oceanography, 403 004 Dona Paula, Goa, India;(2) Institute of Oceanographie Sciences, Deacon Laboratory, GU8 5UB Wormley, Godalming, UK
Abstract:The rare earth element (REE) contents of sixteen surficial calcareous sediments from the southwestern Carlsberg Ridge, Indian Ocean, have been determined. The total REE vary from 35 ppm to 126 ppm and are inversely related to the calcium carbonate content. REEs show a strong positive correlation with Al + Fe + K + Mg + Na (r 2= 0.98) and Mn + Fe + Cu + Ni (r 2= 0.86) suggesting that the REE is associated with a combined phase of clays (mainly illite) and Mn-Fe oxyhydroxides. The aeolian input into these sediments is suggested from the weak positive Eu/Eu* anomaly. Shale-normalized (NASC) pattern along with La(n)/Yb(n) ratio suggest enrichment of heavy REE (HREE) relative to the light REE (LREE) with a negative Ce/Ce* anomaly implying retention of a bottom water REE pattern. An erratum to this article is available at .
Keywords:REE  clays  Mn-Fe oxyhydroxides
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