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

Prakash, L. Surya; Ray, Durbar; Paropkari, A.L.; Mudholkar, Abhay; Satyanarayanan, M.; Sreenivas, B.; Chandrasekharam, D.; Kota, Dalayya; Raju, K. A. Kamesh; Kaisary, S.; Balaram, V.; Gurav, Tripti

doi:10.1016/j.chemgeo.2012.03.024

Cited by 105 publications

(41 citation statements)

References 74 publications

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“…Diagenetic origin from pore waters and/or associated phases. Our foraminiferal REE patterns resemble the easily exchangeable REE and carbonate phase of multi-phase leaching studies from ferromanganese oxides given that the Mn and Fe oxide-phases show clear positive Ce-anomalies (Bau and Koschinsky, 2009;Surya Prakash et al, 2012). Also fish teeth that obtain their REE during early diagenesis show REE patterns similar to our foraminiferal samples having a negative Ce-anomaly and a MREE bulge (Martin et al, 2010).…”

Section: Ree Patternsmentioning

confidence: 48%

Assessment of seawater Nd isotope signatures extracted from foraminiferal shells and authigenic phases of Gulf of Guinea sediments

Kraft

Hathorne

Weldeab

2013

Geochimica et Cosmochimica Acta

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The radiogenic neodymium (Nd) isotope composition of foraminiferal shells provides a powerful archive to investigate past changes in sources and mixing of water masses. However, seawater Nd isotope ratios extracted from foraminiferal shells can be biased by contaminant phases such as organic matter, silicates, or ferromanganese coatings, the removal of which requires rigorous multiple step cleaning of the samples. Here we investigate the efficiency of Flow Through and batch cleaning methods to extract seawater Nd isotope compositions from planktonic foraminifera in a shelf setting in the Gulf of Guinea that is strongly influenced by riverine sediment inputs. Nd isotope analyses of reductively and oxidatively cleaned mono-specific planktonic foraminiferal samples and reductively cleaned mixed benthic foraminifera were complemented by analyses of non-reductively cleaned mono-specific planktonic foraminiferal samples, Fe-Mn coatings of de-carbonated bulk sediment leachates, and the residual detrital fraction of the same sediment.Al/Ca and Mn/Ca ratios of fully cleaned foraminiferal samples reveal indistinguishable levels of cleaning efficiency between the batch and the Flow Through methods and the Nd isotope compositions obtained from application of both methods are identical within error. Furthermore, non-reductively cleaned foraminiferal samples have the same Nd isotope composition as reductively cleaned foraminifera at our study sites. Close to the Niger River mouth the Nd isotope composition of the foraminifera agree with the seawater Nd isotope composition of nearby stations. Based on the combined extracted Nd isotope signatures and element to calcium ratios, as well as rare earth element distribution patterns, we infer that the planktonic foraminiferal Nd isotope signatures reflect bottom water/pore water signatures. The isotopic composition of the bulk de-carbonated sediment leachates (Fe-Mn coatings) differs significantly from the foraminiferal data at this site and probably reflects particles that acquired their ferromanganese/pre-formed pre-formed/ferromanganese coatings in nearby rivers. Therefore, in such river influenced shelf settings foraminiferal shells should be used to obtain unbiased bottom seawater signatures.

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Section: Ree Patternsmentioning

confidence: 48%

Assessment of seawater Nd isotope signatures extracted from foraminiferal shells and authigenic phases of Gulf of Guinea sediments

Kraft

Hathorne

Weldeab

2013

Geochimica et Cosmochimica Acta

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“…Both the diagrams in a and b show most of the Fe–Mn crusts from 06°38.5′S CIR are hydrogenous in nature. Data source of SM2 and CIOB crusts is from Prakash et al () [Colour figure can be viewed at wileyonlinelibrary.com]…”

Section: Resultsmentioning

confidence: 99%

“…A comparison with Fe–Mn oxides from Andaman arc (SM2) and Central Indian Ocean Basin (CIOB) are also shown here. Data source of SM2 and CIOB crusts is from Prakash et al () [Colour figure can be viewed at wileyonlinelibrary.com]…”

Section: Resultsmentioning

confidence: 99%

“…Post‐Archaean Australian Shale (PAAS) normalized bulk rare earth elements (REE)–yttrium patterns of Fe–Mn encrustations from (a) the Central Indian Ridge, and (b) Andaman arc (TVG‐11, TVG‐12, and DR‐06), and Central Indian Ocean Basin (DR‐12 and OG‐116; all data in b are from Prakash et al, ) [Colour figure can be viewed at wileyonlinelibrary.com]…”

Section: Resultsmentioning

confidence: 99%

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Geochemical, mineralogical, and Sr–Nd isotopic compositions of ferromanganese encrustations from Central Indian Ridge at 06°38.5′S

et al. 2017

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Mineralogical, geochemical, and isotopic (Sr and Nd) studies of 14 ferromanganese encrustations on basaltic substrates from Central Indian Ridge at 06°38.5′S indicate that except for two (NC3 and NC4), the samples are hydrogenous type. NC3 and NC4 have slightly higher growth rates, lower bulk trace metal contents, and low ∑REE. They have a lower content of high field strength (e.g., Hf, Ta, Zr, and Nb), incompatible (e.g., Pb, Th, and U), and lithophilic elements (e.g., Sr and Ba) than others. In addition, NC3 has a lower 87Sr/86Sr ratio (0.708825) than the remaining samples (range 0.709169–0.709253) but higher 143Nd/144Nd ratio (0.512296) than others (range 0.512258–0.512279). Both NC3 and NC4 have a higher radiogenic component indicated by their low εNd value (−6.67) than the remaining samples (range −7.00 to −7.41). These evidences together indicate a possible contribution of trace metals by a local mixed source of hydrothermal and hydrogenous origin during their growth history.

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“…subsurface environments surrounding the storage and/or the disposal sites over geological time scale. The migration of REEs in groundwater is greatly influenced by the formation of complexes with inorganic and organic ligands (e.g., Takahashi et al, 1997;Ingri et al, 2000;Ohta and Kawabe, 2001;Yoshida et al, 2004;Tang and Johannesson, 2010;Prakash et al, 2012;Terashima et al, 2012). Most REEs exhibit a trivalent oxidation state in the ambient environment.…”

Section: Introductionmentioning

confidence: 99%

Sorption of trivalent cerium by a mixture of microbial cells and manganese oxides: Effect of microbial cells on the oxidation of trivalent cerium

Ohnuki

Jiang

Sakamoto

et al. 2015

Geochimica et Cosmochimica Acta

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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

Cited by 105 publications

References 74 publications

Assessment of seawater Nd isotope signatures extracted from foraminiferal shells and authigenic phases of Gulf of Guinea sediments

Assessment of seawater Nd isotope signatures extracted from foraminiferal shells and authigenic phases of Gulf of Guinea sediments

Geochemical, mineralogical, and Sr–Nd isotopic compositions of ferromanganese encrustations from Central Indian Ridge at 06°38.5′S

Sorption of trivalent cerium by a mixture of microbial cells and manganese oxides: Effect of microbial cells on the oxidation of trivalent cerium

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