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Distribution of REEs and yttrium among major geochemical phases of marine Fe–Mn-oxides: Comparative study between hydrogenous and hydrothermal deposits

DRS at CSIR-National Institute of Oceanography

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Title Distribution of REEs and yttrium among major geochemical phases of marine Fe–Mn-oxides: Comparative study between hydrogenous and hydrothermal deposits
 
Creator SuryaPrakash, L.
Ray, D.
Paropkari, A.L.
Mudholkar, A.V.
Satyanarayanan, M.
Sreenivas, B.
Chandrasekharam, D.
Kota, D.
KameshRaju, K.A.
Kaisary, S.
Balaram, V.
Gurav, T.
 
Subject ferromanganese oxides
yttrium
rare earths
hydrothermal deposits
chemical sediments
 
Description Mineralogy and geochemistry of the ferromanganese oxides collected from two seamounts in the Andaman Sea have been investigated with special reference to the solid phase partitioning behavior of rare earth elements (REEs). Bulk elemental compositions indicate that the oxides from a volcanic cratered seamount, CSM, are hydrothermal while those from another seamount, SM2, are hydrogenous in origin. The distributions of REEs and yttrium in four geochemical phases (viz. easily exchangeable, Mn-oxide, Feoxyhydroxide and residual) of CSM-oxides were distinctly different from that of SM2-oxides. In CSM-oxides, the REEs and yttrium are mainly associated with Fe-oxyhydroxide phase while in SM2-oxides, both Mn-oxide and Fe-oxyhydroxide phases contain the major fraction of these elements. The exchangeable and residual phases of both hydrothermal and hydrogenous oxides have extremely low REE-content. The shale normalized negative Ce-anomalies and relative enrichment of heavy REE, characteristic of hydrothermal oxides, are retained in Fe-oxyhydroxide phase. In hydrogenous oxides, the positive Ce-anomalies occurred in both Fe and Mn-oxide phases while negative Y-anomalies were found only in Fe-oxyhydroxide phase. The phase distribution of REEs and yttrium in hydrothermal oxides is described in terms of co-precipitation and adsorption of their halide complexes and available free ions in hydrothermal solutions. Instead, adsorption of major carbonate species from seawater primarily regulates the partitioning of REEs among the coexisting phases of hydrogenous oxides.
 
Date 2012-06-05T07:03:16Z
2012-06-05T07:03:16Z
2012
 
Type Journal Article
 
Identifier Chemical Geology, vol.312-313; 2012; 127-137
http://drs.nio.org/drs/handle/2264/4069
 
Language en
 
Rights An edited version of this paper was published by Elsevier. Copyright [2012] Elsevier
 
Publisher Elsevier