Geochemistry of trace and minor elements in sediments and manganese micronodules from the Angola Basin

Дубинин, А. В.; Sval'nov, Vyacheslav N; Berezhnaya, E. D.; Rimskaya-Korsakova, M. N.; Demidova, T. A.

doi:10.1134/s0024490213030048

Cited by 24 publications

(8 citation statements)

References 23 publications

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“…The average REE concentrations for sedimentary organic matter (This study) are compared with non-exhaustive synthetical data from the literature for: Fe-Mn nodules/crusts (Decarlo, 1991;Dubinin et al, 2013;Nath et al, 1992;Zhang et al, 2012), Fe-Mn oxyhydroxide coatings from marine sediments or foraminifera (Bayon et al, 2004;Charbonnier et al, 2012;Palmer and Elderfield, 1986), Biogenic carbonates: (Akagi et al, 2004;Charbonnier et al, 2012;Kasper-Zubillaga et al, 2010;Liu et al, 2011;Nothdurft et al, 2004;Sholkovitz and Shen, 1995;Webb and Kamber, 2000;Wyndham et al, 2004), Anoxic pore water: (Bayon et al, 2011b), River water: (Elderfield et al, 1990;Goldstein and Jacobsen, 1988b, c;Hoyle et al, 1984;Keasler and Loveland, 1982;Kulaksiz and Bau, 2013;Nozaki et al, 2000;Pokrovsky et al, 2006;Shiller, 2010;Stolpe et al, 2013;Xu and Han, 2009). Average REE data for seawater are from Nozaki, 2001.…”

Section: Table 5: Typical Ree Concentrations In Natural Waters and Mamentioning

confidence: 99%

Rare earth elements and neodymium isotopes in sedimentary organic matter

Freslon

Bayon

Toucanne

et al. 2014

Geochimica et Cosmochimica Acta

127

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International audienceWe report rare earth element (REE) and neodymium (Nd) isotope data for the organic fraction of sediments collected from various depositional environments, i.e. rivers (n=25), estuaries (n=18), open-ocean settings (n=15), and cold seeps (n=12). Sedimentary organic matter (SOM) was extracted using a mixed hydrogen peroxide/nitric acid solution (20%-H2O2-0.02M-HNO3), after removal of carbonate and oxy-hydroxide phases with dilute hydrochloric acid (0.25M-HCl). A series of experimental tests indicate that extraction of sedimentary organic compounds using H2O2 may be complicated occasionally by partial dissolution of sulphide minerals and residual carbonates. However, this contamination is expected to be minor for REE because measured concentrations in H2O2 leachates are about two-orders of magnitude higher than in the above mentioned phases.The mean REE concentrations determined in the H2O2 leachates for samples from rivers, estuaries, coastal seas and open-ocean settings yield relatively similar levels, with σREE=109±86ppm (mean±s; n=58). The organic fractions leached from cold seep sediments display even higher concentration levels (285±150ppm; mean±s; n=12). The H2O2 leachates for most sediments exhibit remarkably similar shale-normalized REE patterns, all characterized by a mid-REE enrichment compared to the other REE. This suggests that the distribution of REE in leached sedimentary organic phases is controlled primarily by biogeochemical processes, rather than by the composition of the source from which they derive (e.g. pore, river or sea-water).The Nd isotopic compositions for organic phases leached from river sediments are very similar to those for the corresponding detrital fractions. In contrast, the SOM extracted from marine sediments display εNd values that typically range between the εNd signatures for terrestrial organic matter (inferred from the analysis of the sedimentary detrital fractions) and marine organic matter (inferred from the analysis of local surface seawater). A notable exception is the case of organic matter (OM) fractions leached from cold seep sediment samples, which sometimes exhibit εNd values markedly different from both terrigenous and surface seawater signatures. This suggests that a significant fraction of organic compounds in these sediments may be derived from chemosynthetic processes, recycling pore water REE characterized by a distinct isotopic composition.Overall, our results confirm that organic matter probably plays an important role in the oceanic REE budget, through direct scavenging and remineralization within the water column. Both the high REE abundances and the shape of shale-normalized patterns for leached SOM also suggest that OM degradation in sub-surface marine sediments during early diagenesis could control, to a large extent, the distribution of REE in pore waters. Benthic fluxes of organic-bound REE could hence substantially contribute to the exchange processes between particulates and seawater that take place at ocean margins. Neodymium ...

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Section: Table 5: Typical Ree Concentrations In Natural Waters and Mamentioning

confidence: 99%

Rare earth elements and neodymium isotopes in sedimentary organic matter

Freslon

Bayon

Toucanne

et al. 2014

Geochimica et Cosmochimica Acta

127

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“…Precipitation of these Mn compounds may fully adhere to the processes of abiotic crystallization especially in the environments rich in dissolved Mn(II) (i.e., hydrothermal vents and acid mine drainages) [95]. It is however believed that the formation of the mentioned Mn phases proceeds from biogenic δMnO2 in those settings deprived in Mn(II), such as Albeit smaller in size the morphology and chemistry of analyzed Mn-Fe mineralization shows a correlation with the Mn nodules described in literature [63][64][65][66][67]. Based on granular morphology, minuscule size, and layered chemistry of studied coatings these may be described as juvenile Mn-micronodules [68][69][70], which are characterized by variable chemistry [69,71] and XRD mineralogy that regularly demonstrates presence of Mn-oxides (i.e., burserite, todorokite, δMnO 2 , jacobsite, and ranciéite), Fe-oxyhydroxides and detrital aluminosilicates [72][73][74].…”

Section: Sem-eds Mineralogy and Morphology Of Mn-fe Micronodulesmentioning

confidence: 79%

Smectitization as a Trigger of Bacterially Mediated Mn-Fe Micronodule Generation in Felsic Glass (Livno-Tomislavgrad Paleolake, Bosnia and Herzegovina)

et al. 2020

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Miocene tuffs preserved in argillaceous sediment interbedded with lacustrine successions are commonly encountered throughout the Dinarides Lake System (DLS) in south-eastern Europe. In this contribution the volcanic glass degradation and co-genetic Mn-Fe precipitation were studied in a 14.68 Ma felsic tuff from DLS Livno-Tomislavgrad Basin. Microbial activity has been involved in both reactions thus adding the interest of revealing effects of biotic and abiotic processes taking place during tuff eogenesis. X-ray diffraction and electron microbeam analysis with energy-dispersive X-ray spectroscopy revealed the pitting or granular structures developed at glass rims along with smectite flakes protruding from a degrading glass. Mn-Fe mineralization emerges in the form of Mn-Fe coatings, an initial step to micronodule formation, where traces of biogenetic influence included a high content of phases rich in structural Mn (IV) (i.e., ranciéite and jacobsite) and presence of microbial microfossils. Co-genetic ties between glass degradation and Mn-Fe precipitation were established through the report of dioctahedral smectite formed out of altered glass; which then served as nuclei of the ongoing biotic and abiotic Mn-Fe mineralization. These processes manifest on a continuous involvement of microbial life in the course of eogenesis of pyroclastic material in lacustrine environments.

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“…Cerium (II) oxidation can be produced by the available oxygen within the water column (e.g. Elderfield et al, 1981;Dubinin et al, 2013) or by MnO 2 (Ohta and Kawabe, 2001) while Ce (IV) reduction can be generated by low redox potentials (Elderfield and Sholkovitz, 1987) and/or acidic conditions (Elderfield et al, 1990;Xu and Han, 2009). The high values of Ce anomalies in SPM (Fig.…”

Section: Particles Transfer From Sediment To Mtzmentioning

confidence: 99%

Particles transformation in estuaries: Fe, Mn and REE signatures through the Loire Estuary

Chanvalon¹,

Metzger²,

Mouret³

et al. 2016

Journal of Sea Research

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During their transfer across estuaries, particles endure numerous cycles of deposition-resuspension accompanied by several redox oscillations. These oscillations are likely to modify the particles content of redox sensitive metals such as Fe, Mn and two rare earth elements (REE): Ce and Eu. The present paper focuses on the fate of particles originating from the Loire Estuary by the study of chemical composition changes of both total and ascorbate-extracted phases. Transformations of particles buried in the sediment are estimated from sediment cores sampled in an estuarine intertidal mudflat Changes affecting particles that are transferred to the ocean are evaluated by comparing the composition of suspended particulate matter (SPM) from riverine time series to coastal marine SPM. Our results show an important decrease of SPM iron content corresponding to a loss of 14.3% of total iron. However, no iron storage was observed in the intertidal mudflat. Manganese is probably also lost during the transfer but the riverine temporal variability prevents its quantification. The similarity of Ce and Eu signatures between highly concentrated SPM and sedimentary particles suggests that most estuarine transformations are probably induced by early diagenesis during deposition (and frequently anoxic) periods. dissolved according to the order predicted by the sequence of microbial anaerobic respiration processes (Froelich et al., 1979). In a predominantly oxic environment affected by short anoxic events, NO 3 and Mn oxides are the most reactive elements (

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Geochemistry of trace and minor elements in sediments and manganese micronodules from the Angola Basin

Cited by 24 publications

References 23 publications

Rare earth elements and neodymium isotopes in sedimentary organic matter

Rare earth elements and neodymium isotopes in sedimentary organic matter

Smectitization as a Trigger of Bacterially Mediated Mn-Fe Micronodule Generation in Felsic Glass (Livno-Tomislavgrad Paleolake, Bosnia and Herzegovina)

Particles transformation in estuaries: Fe, Mn and REE signatures through the Loire Estuary

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