Chemical processes for the extreme enrichment of tellurium into marine ferromanganese oxides

Kashiwabara, Teruhiko; Oishi, Yasuko; Sakaguchi, Aya; Sugiyama, Tatsurou; Usui, Akira; Takahashi, Yoshio

doi:10.1016/j.gca.2014.01.020

Cited by 50 publications

(50 citation statements)

References 60 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Ferromanganese crusts are products of extremely slow sedimentation rates (1–10 mm/Ma; Hein et al., ), while black shales accumulate about 1,000 times faster (1–10 m/Ma; Stow, Huc, & Bertrand, ), though still slowly for sedimentary deposition. The extreme enrichment of Te in ferromanganese crusts (average 31 ppm) reflects the extremely slow precipitation rate of these deposits (Hein et al., ; Kashiwabara et al., ). Taking into account a potential three orders of magnitude difference in sedimentation rate, the sequestration rate of Te is greater in the black shale of the Gwna Group.…”

Section: Discussionmentioning

confidence: 99%

“…Deep marine ferromanganese crusts are considered key targets for seafloor mining due to their abundance in a range of trace elements, specifically Te and Co (Hein, Conrad, & Staudigel, ; Hein, Koschinsky, Bau, & Roberts, ; Hein, Koschinsky, & Halliday, ). Tellurium is fractionated from its common partner Se in oxidising conditions by adsorption on iron oxide, while Se is soluble in oxidising conditions (Kashiwabara et al., ) and not enriched in ferromanganese crusts. The expense and environmental impact of seafloor mining are key issues in the extraction of ferromanganese crusts, which may become utilised as demand for Co and Te increases.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Tellurium, selenium and cobalt enrichment in Neoproterozoic black shales, Gwna Group, UK: Deep marine trace element enrichment during the Second Great Oxygenation Event

et al. 2018

View full text Add to dashboard Cite

Black shales of the late Neoproterozoic Gwna Group (570-580 Ma), UK, contain enrichments of tellurium (Te), selenium (Se) and cobalt (Co) relative to average shale compositions. The Te and Co enrichments bear comparison with those of ferromanganese crusts in the modern deep ocean. Gwna Group deposition coincides with the Second Great Oxidation Event, which had a significant effect on trace element fixation globally. Selenium and Te concentrations within these black shales indicate increased continental weathering rates, high biological productivity and corresponding increases in atmospheric O 2 concentrations. Cobalt, nickel (Ni) and arsenic (As) enrichments in this succession are secondary mineralisation phases. Demand for many of the trace elements found enriched in the Gwna Group black shales make their mechanisms of accumulation, and variations through the geological record, important to understand, and suggests that new resources may be sought based on black shale protoliths from this period.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Tellurium, selenium and cobalt enrichment in Neoproterozoic black shales, Gwna Group, UK: Deep marine trace element enrichment during the Second Great Oxygenation Event

et al. 2018

View full text Add to dashboard Cite

show abstract

“…In all these cases, the events would have likely been short lived compared to the growth rates typical of crusts and would have influenced the composition of only extant laminae formation, <1-2 mm, perhaps longer for a series of productivity cycles. A further possibility is variable co-precipitation of V with the Mn oxides, which would avoid the conflict of particle surface charge and sorbed ion charge being the same, such as was proposed for Te, e.g., [42]. Up to 59% of the Cr in the Arctic crusts occurs in the L4 detrital material, a marked difference compared to the central Pacific crusts where 89% of Cr occurs in the L3 Fe phase and less than 2% in the L4 residual phase.…”

Section: Elements Forming Oxyanionsmentioning

confidence: 99%

Mineral Phase-Element Associations Based on Sequential Leaching of Ferromanganese Crusts, Amerasia Basin Arctic Ocean

et al. 2018

View full text Add to dashboard Cite

Ferromanganese (FeMn) crusts from Mendeleev Ridge, Chukchi Borderland, and Alpha Ridge, in the Amerasia Basin, Arctic Ocean, are similar based on morphology and chemical composition. The crusts are characterized by a two- to four-layered stratigraphy. The chemical composition of the Arctic crusts differs significantly from hydrogenetic crusts from elsewhere of global ocean by high mean Fe/Mn ratios, high As, Li, V, Sc, and Th concentrations, and high detrital contents. Here, we present element distributions through crust stratigraphic sections and element phase association using several complementary techniques such as SEM-EDS, LA-ICP-MS, and sequential leaching, a widely employed method of element phase association that dissolves mineral phases of different stability step-by-step: Exchangeable cations and Ca carbonates, Mn-oxides, Fe-hydroxides, and residual fraction. Sequential leaching shows that the Arctic crusts have higher contents of most elements characteristic of the aluminosilicate phase than do Pacific crusts. Elements have similar distributions between the hydrogenetic Mn and Fe phases in all the Arctic and Pacific crusts. The main host phases for the elements enriched in the Arctic crusts over Pacific crusts (Li, As, Th, and V) are the Mn-phase for Li and Fe-phase for As, Th, and V; those elements also have higher contents in the residual aluminosilicate phase. Thus, higher concentrations of Li, As, Th, and V likely occur in the dissolved and particulate phases in bottom waters where the Arctic crusts grow, which has been shown to be true for Sc, also highly enriched in the crusts. The phase distributions of elements within the crust layers is mostly consistent among the Arctic crusts, being somewhat different in element concentrations in the residual phase.

show abstract

“…On the basis of the bulk chemical analyses, the concentrations of As and Mo in AD14 were ∼194 and ∼469 mg/kg, respectively, and those in D535 were ∼157 and ∼289 mg/kg, respectively. 2,3,12 The XRD patterns of AD14 and D535 were scanned by a RIGUKA diffractometer (RINT-2100) equipped with Cu Kα (λ = 1.5406 Å) radiation (40 kV voltage and 20 mA cathodic current). The scanning range was from 5°to 70°, and the scanning step was 0.02°.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

Comparison of Arsenate and Molybdate Speciation in Hydrogenetic Ferromanganese Nodules

Yang

Uesugi

Qin

et al. 2018

ACS Earth Space Chem.

Self Cite

View full text Add to dashboard Cite

Marine ferromanganese oxides contain a large amount of trace elements, such as arsenic (As) and molybdenum (Mo). However, the host phases of tetrahedral AsO 4 3− and MoO 4 2− oxyanions therein have not been clearly identified thus far. In this work, we explored the mineralogical components of hydrogenetic (HG) ferromanganese nodules and compared the distribution behaviors of As and Mo. The X-ray diffraction (XRD) and X-ray absorption spectroscopy (XAS) analyses showed that the predominant manganese and iron phases were vernadite (δ-MnO 2 ) and ferrihydrite, respectively. According to the sequential extraction examination, both As and Mo were associated with the iron (oxyhydr)oxide phases. However, the XAS analyses indicated that As was retained by the ferrihydrite phase via double cornershared complexation, while Mo was preferentially adsorbed on δ-MnO 2 via edge-shared complexation. The immobilization of As and Mo by HG ferromanganese samples was attributed to specific chemical binding (ΔG chem ) rather than Coulombic interaction (ΔG coul ) as proposed in previous studies. The comparison of Mo XAS spectra before and after extraction revealed the unreliability of the sequential extraction approach to determine the host phase of trace elements as a result of the potential readsorption risk. The different distribution trends of As and Mo were due to their disparate intrinsic properties (e.g., averaged dissociation constants of conjugate acids) and the diverse properties (i.e., surface site densify, adsorption equilibrium constant, and crystalline structure) of ferrihydrite and δ-MnO 2 . These research findings would be significant for evaluating the geochemical behaviors and environmental fate of trace elements in marine systems.

show abstract

Chemical processes for the extreme enrichment of tellurium into marine ferromanganese oxides

Cited by 50 publications

References 60 publications

Tellurium, selenium and cobalt enrichment in Neoproterozoic black shales, Gwna Group, UK: Deep marine trace element enrichment during the Second Great Oxygenation Event

Tellurium, selenium and cobalt enrichment in Neoproterozoic black shales, Gwna Group, UK: Deep marine trace element enrichment during the Second Great Oxygenation Event

Mineral Phase-Element Associations Based on Sequential Leaching of Ferromanganese Crusts, Amerasia Basin Arctic Ocean

Comparison of Arsenate and Molybdate Speciation in Hydrogenetic Ferromanganese Nodules

Contact Info

Product

Resources

About