Formation of todorokite from vernadite in Ni-rich hemipelagic sediments

Bodeï, Sabine; Manceau, Alain; Geoffroy, Nicolas; Baronnet, Alain; Buatier, Martine

doi:10.1016/j.gca.2007.07.020

Cited by 154 publications

(182 citation statements)

References 106 publications

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“…Natural marine and soil Mn oxides frequently have been reported to be poorly crystalline and to exhibit layer structures (Post, 1999;Manceau et al, 2005;Bodei et al, 2007). It is likely that such morphologies implicate biogenic origin.…”

Section: Comparison To Laboratory Bacteriogenic Mn Oxidesmentioning

confidence: 99%

“…It can thus be concluded that this nanoparticulate layered structural motif is characteristic of (but not necessarily unique to) laboratory biogenic Mn oxides. These conclusions lead one to question if environmental biogenic Mn oxides exhibit such characteristics (intriguingly, such features are frequently reported for poorly crystalline natural Mn oxides of possible biogenic origin (Post, 1999;Manceau et al, 2005;Bodei et al, 2007)). Establishing similarity between laboratory and environmental biogenic Mn oxides, were it to occur, would represent a significant step forward because it would provide the scientific basis to model the behavior of environmental Mn oxides based on data from laboratory studies.…”

Section: Introductionmentioning

confidence: 99%

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Structural characterization of terrestrial microbial Mn oxides from Pinal Creek, AZ

Bargar

Fuller

Marcus

et al. 2009

Geochimica et Cosmochimica Acta

109

106

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The microbial catalysis of Mn(II) oxidation is believed to be a dominant source of abundant sorption-and redox-active Mn oxides in marine, freshwater, and subsurface aquatic environments. In spite of their importance, environmental oxides of known biogenic origin have generally not been characterized in detail from a structural perspective. Hyporheic zone Mn oxide grain coatings at Pinal Creek, Arizona, a metals-contaminated stream, have been identified as being dominantly microbial in origin and are well studied from bulk chemistry and contaminant hydrology perspectives. This site thus presents an excellent opportunity to study the structures of terrestrial microbial Mn oxides in detail. XRD and EXAFS measurements performed in this study indicate that the hydrated Pinal Creek Mn oxide grain coatings are layer-type Mn oxides with dominantly hexagonal or pseudo-hexagonal layer symmetry. XRD and TEM measurements suggest the oxides to be nanoparticulate plates with average dimensions on the order of 11 nm thick Â 35 nm diameter, but with individual particles exhibiting thickness as small as a single layer and sheets as wide as 500 nm. The hydrated oxides exhibit a 10-Å basal-plane spacing and turbostratic disorder. EXAFS analyses suggest the oxides contain layer Mn(IV) site vacancy defects, and layer Mn(III) is inferred to be present, as deduced from Jahn-Teller distortion of the local structure. The physical geometry and structural details of the coatings suggest formation within microbial biofilms. The biogenic Mn oxides are stable with respect to transformation into thermodynamically more stable phases over a time scale of at least 5 months. The nanoparticulate layered structural motif, also observed in pure culture laboratory studies, appears to be characteristic of biogenic Mn oxides and may explain the common occurrence of this mineral habit in soils and sediments.

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Section: Comparison To Laboratory Bacteriogenic Mn Oxidesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Structural characterization of terrestrial microbial Mn oxides from Pinal Creek, AZ

Bargar

Fuller

Marcus

et al. 2009

Geochimica et Cosmochimica Acta

109

106

View full text Add to dashboard Cite

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“…Todorokite is a manganate with a tunneled-structure and an octahedral sheet of about 10 Å with a cross row octahedral chain running along the b axis. 10Å-vernadite is a disordered phyllomanganate with a 10 Å-thick octahedral sheet layer related to the presence of water and cations within the interlayer (Bodeï et al, 2007;Manceau et al, 2007). These oxyhydroxides show micro-hemispheroidal structures or filament textures under the SEM (Fig.…”

Section: Sedimentology and Mineralogymentioning

confidence: 99%

Characterization of metalliferous sediment from a low-temperature hydrothermal environment on the Eastern Flank of the East Pacific Rise

et al. 2008

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Metalliferous deposits are described from the eastern flank of the East Pacific Rise (EPR) offshore Costa Rica, close to a basaltic seamount called "Dorado high".Based on heat-flow data and porewater profiles, the site is an area of active low temperature hydrothermal discharge. We focus on the mineralogical and chemical analyses from a 124 cm long gravity core (GC50), located on the north-western slope of the 100 m high Dorado high. In this core, the sediments consist of detrital clay minerals as well as authigenic minerals such as zeolites, apatites, and Fe/Mn-rich oxyhydroxides. In contrast, the reference sediments from adjacent areas without hydrothermal activity are olive gray hemipelagic muds composed of volcanic glass particles, clay minerals, siliceous microfossils, and some detrital quartz and feldspar.Bulk sediment chemistry and chemical enrichment factors calculated with respect to the reference sediment indicate that the most important chemical changes occurred at the base of the core from 100 to 124 cm bsf, with strong enrichments in MnO, CaO, P 2 O 5 , and Fe 2 O 3 . These enrichments are correlated with the occurrence of authigenic Fe-oxyhydroxide (goethite) and Mn oxide (todorokite and vernadite, at 100 cm bsf), and hydrothermal apatite (110-124 cm bsf). In the upper section of the core from 12 to 70 cm, the sediment is composed of abundant smectite and authigenic phillipsite, and only minor chemical changes can be observed with respect to the reference sediments.The ubiquitous presence of phillipsite suggests that the entire sedimentary column of core GC50 was first affected by diagenesis. However, below 70 cm bsf, these phillipsites are partially dissolved and Fe oxides occur from 110 to 124 cm, followed 2 upward by Mn oxides at 100 cm. This transition from Fe to Mn rich sediments can be interpreted in terms of an upward increasing redox potential. PAAS-normalized REE patterns of GC50 sediments present clearly negative Ce and positive Y anomalies inherited from seawater at the base of core GC50. These anomalies decrease upward, which we interpret together with the transition from Fe to Mn-rich sediments by an upward migrating low temperature hydrothermal fluid. Thus, after a first stage of diagenesis, the discharge of a low temperature hydrothermal fluid occurred through the sedimentary column, leading to the precipitation of hydrothermal compounds that are lacking towards the surface.

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“…Besides the retention of Ni on birnessite precipitated in soils or sediments of metalimpacted ecosystems, ferromanganese nodules can accumulate up to percent levels of Ni by mass (Manceau et al, 1987;Bodei et al, 2007;Manceau et al, 2007a). In nodules from marine (Bodei et al, 2007;Peacock and Sherman, 2007a), freshwater (Manceau et al, 2007a), and soil environments (Manceau et al, 2002b;Manceau et al, 2003), Ni was present as a divalent cation incorporated (inc) into the octahedral sheets of layer-type Mn(IV) oxide minerals ( Fig.…”

Section: Introductionmentioning

confidence: 99%

“…In nodules from marine (Bodei et al, 2007;Peacock and Sherman, 2007a), freshwater (Manceau et al, 2007a), and soil environments (Manceau et al, 2002b;Manceau et al, 2003), Ni was present as a divalent cation incorporated (inc) into the octahedral sheets of layer-type Mn(IV) oxide minerals ( Fig. 1a).…”

Section: Introductionmentioning

confidence: 99%

Mechanisms of nickel sorption by a bacteriogenic birnessite

Peña

Kwon

Refson

et al. 2010

Geochimica et Cosmochimica Acta

119

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Bacteriogenic birnessite nanoparticles have a large capacity to adsorb metal cations due to their high proportion of cation vacancy defects. In the current study, a synergistic experimental-computational approach was used to study the molecular-scale mechanisms of Ni sorption at varying loadings and at pH 6-8 using the hexagonal birnessite produced by Pseudomonas putida GB-1. We found that Ni is scavenged effectively by the biomass-

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Formation of todorokite from vernadite in Ni-rich hemipelagic sediments

Cited by 154 publications

References 106 publications

Structural characterization of terrestrial microbial Mn oxides from Pinal Creek, AZ

Structural characterization of terrestrial microbial Mn oxides from Pinal Creek, AZ

Characterization of metalliferous sediment from a low-temperature hydrothermal environment on the Eastern Flank of the East Pacific Rise

Mechanisms of nickel sorption by a bacteriogenic birnessite

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