Uranium accumulation in modern and ancient Fe-oxide sediments: Examples from the Ashadze-2 hydrothermal sulfide field (Mid-Atlantic Ridge) and Yubileynoe massive sulfide deposit (South Urals, Russia)

Ayupova, N. R.; Melekestseva, I. Yu.; Масленников, В. В.; Tseluyko, A. S.; Blinov, Ivan A.; Bel’tenev, V. E.

doi:10.1016/j.sedgeo.2018.02.009

Cited by 22 publications

(21 citation statements)

References 39 publications

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“…The nodule from sulfide-carbonate-hyaloclastite diagenites of the Talgan deposit is rich in V, Mn, Cu, Zn, Cd, Sb, Te, W, and Pb, which were sourced from seawater (V), hyaloclastites (Mn, W), and Cu-Zn ore clasts with numerous inclusions of accessory Te-, Pb-, and Sb-bearing minerals (Cu, Zn, Cd, Te, Pb). In contrast to the Saf'yanovskoe nodule, V in the Talgan pyrite nodule was not consumed by organic matter and was absorbed directly from seawater by clay minerals included in pyrite [63], which is supported by a positive correlation (r = 0.87, Supplementary Material) between V and U (typical seawater-derived elements [60,64]) in pyrite. The formation of abundant authigenic sphalerite occurred in higher alkaline conditions because of the presence of carbonate material (cf.…”

Section: Geochemistry Of Pyrite Nodulesmentioning

confidence: 80%

Authigenesis at the Urals Massive Sulfide Deposits: Insight from Pyrite Nodules Hosted in Ore Diagenites

et al. 2020

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The pyrite nodules from ore diagenites of the Urals massive sulfide deposits associated with various background sedimentary rocks are studied using optical and electron microscopy and LA-ICP-MS analysis. The nodules are found in sulfide–black shale, sulfide–carbonate–hyaloclastite, and sulfide–serpentinite diagenites of the Saf’yanovskoe, Talgan, and Dergamysh deposits, respectively. The nodules consist of the core made up of early diagenetic fine-crystalline (grained) pyrite and the rim (±intermediate zone) composed of late diagenetic coarse-crystalline pyrite. The nodules are replaced by authigenic sphalerite, chalcopyrite, galena, and fahlores (Saf’yanovskoe), sphalerite, chalcopyrite and galena (Talgan), and pyrrhotite and chalcopyrite (Dergamysh). They exhibit specific accessory mineral assemblages with dominant galena and fahlores, various tellurides and Co–Ni sulfoarsenides in sulfide-black shale, sulfide–hyaloclastite–carbonate, and sulfide-serpentinite diagenites, respectively. The core of nodules is enriched in trace elements in contrast to the rim. The nodules from sulfide–black shale diagenites are enriched in most trace elements due to their effective sorption by associated organic-rich sediments. The nodules from sulfide–carbonate–hyaloclastite diagenites are rich in elements sourced from seawater, hyaloclastites and copper–zinc ore clasts. The nodules from sulfide–serpentinite diagenites are rich in Co and Ni, which are typical trace elements of ultramafic rocks and primary ores from the deposit.

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Section: Geochemistry Of Pyrite Nodulesmentioning

confidence: 80%

Authigenesis at the Urals Massive Sulfide Deposits: Insight from Pyrite Nodules Hosted in Ore Diagenites

et al. 2020

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“…Researchers state that the rocks for which formation processes could not be resolved by the suggested models can be explained by halmyrolysis processes. In particular, elevated U and V values in this system are interpreted as a consequence of interaction processes with seawater (Maslennikov et al, 2009;Revan et al, 2014;Ayupova et al, 2018). The high U and V contents in the metalliferous sedimentary rocks indicate an origin by reaction with seawater and suggest that the processes leading to the concentration of U and V by iron hydroxides occurred exclusively in the near-vent submarine environment (Garuti and Zaccarini, 2005;Maslennikov et al, 2009;Revan et al, 2014).…”

Section: Discussionmentioning

confidence: 95%

Mineralogy and geochemistry of metalliferous sedimentary rocks from the Upper Cretaceous VMS deposits of the Eastern Pontides (NE Turkey)

Revan¹,

Genç²,

Delibaş³

et al. 2019

Turkish J Earth Sci

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Metalliferous sedimentary rocks, despite being limited in scope, are important stratigraphic horizons within the volcanogenic massive sulfide (VMS) deposits in the Upper Cretaceous volcanic belt of the Eastern Pontides. The metalliferous sedimentary rocks compose a distinctive genetic class. The abundance of such rocks in the Eastern Pontide district provides a basis for study and description that may be more widely applied in other VMS districts. The metalliferous sedimentary rocks generally form layers less than 1.5 m thick above stratiform massive sulfide ores. The metalliferous sediments are largely composed of quartz and hematite. While the Si ± Fe content of sediments directly overlying the stratiform massive sulfide ores is high, an increase in the amount of carbonate is observed in sediments that are not directly overlying the ores. The metalliferous sedimentary rocks were formed by the mixing of mainly chemical components and to a smaller degree detrital components in various proportions due to sedimentation processes occurring on the seafloor. Of the major constituents of the metalliferous sediments, Si, Fe, Cu, Zn, Pb, Sb, and Au generally have a hydrothermal origin, whereas Al, Zr, and Ti are from detrital volcanic and volcaniclastic components. The high levels of U and V indicate a seawater origin, pointing to a submarine environment for the formation of the Eastern Pontide metalliferous sedimentary rocks. The composition of the metalliferous sediments of Eastern Pontide VMS deposits implies that these sediments carry a continental-arc provenance signature. Silica (±iron)-rich rocks in the Eastern Pontides can be used as guide horizons in exploring for volcanogenic massive sulfide deposits in the district since they formed close to the sulfide ores and their areal extents are much greater than those of the sulfide ores. In comparison with their analogues on a global scale, these rocks are broadly comparable to silica-and iron-rich sedimentary rocks in the VMS-bearing districts of the Urals.

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“…These elements may be concentrated at the oxic-postoxic boundary of organic-rich sediments [73] or on the surface of sulfide sediments where U and V are concentrated by an efficient redox trap mechanism [12]. The Pobeda ore deposits yields a maximum average of U (24.86 ppm) in comparison to other massive sulfide deposits (mean 3.53 ppm) of the Mid-Atlantic Ridge [23]. The similar diagenetic processes of U accumulation as uraninite in modern and ancient Fe-oxyhydroxide sediments were the result of U fixation from seawater during the oxidation of sulfide minerals.…”

Section: Co and Nimentioning

confidence: 99%

“…The similar diagenetic processes of U accumulation as uraninite in modern and ancient Fe-oxyhydroxide sediments were the result of U fixation from seawater during the oxidation of sulfide minerals. Uraninite in gossanites is mainly deposited from diagenetic pore fluids, which circulated in the sulfide-hyaloclast-carbonate sediments [23]. Pyrite surfaces are thought to have strong reducing capabilities, which caused fixation of the very low solubility redox-sensitive elements such as V and U, ensuring that they are retained by the pyrite [12].…”

Section: Co and Nimentioning

confidence: 99%

“…The best results were obtained when LA-ICP-MS analyses were combined with genetic interpretation of mineral microfacies and facies [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28]. Most studies so far were dedicated to black smoker chimney microfacies, and less is known about trace elements partitioning in sulfides of low-temperature hydrothermal pyrite-rich crusts associated with diffusers in comparison with high-temperature black smoker microfacies [26].…”

Section: Introductionmentioning

confidence: 99%

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Pyrite Varieties at Pobeda Hydrothermal Fields, Mid-Atlantic Ridge 17°07′–17°08′ N: LA-ICP-MS Data Deciphering

et al. 2020

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The massive sulfide ores of the Pobeda hydrothermal fields are grouped into five main mineral microfacies: (1) isocubanite-pyrite, (2) pyrite-wurtzite-isocubanite, (3) pyrite with minor isocubanite and wurtzite-sphalerite microinclusions, (4) pyrite-rich with framboidal pyrite, and (5) marcasite-pyrite. This sequence reflects the transition from feeder zone facies to seafloor diffuser facies. Spongy, framboidal, and fine-grained pyrite varieties replaced pyrrhotite, greigite, and mackinawite “precursors”. The later coarse and fine banding oscillatory-zoned pyrite and marcasite crystals are overgrown or replaced by unzoned subhedral and euhedral pyrite. In the microfacies range, the amount of isocubanite, wurtzite, unzoned euhedral pyrite decreases versus an increasing portion of framboidal, fine-grained, and spongy pyrite and also marcasite and its colloform and radial varieties. The trace element characteristics of massive sulfides of Pobeda seafloor massive sulfide (SMS) deposit are subdivided into four associations: (1) high temperature—Cu, Se, Te, Bi, Co, and Ni; (2) mid temperature—Zn, As, Sb, and Sn; (3) low temperature—Pb, Sb, Ag, Bi, Au, Tl, and Mn; and (4) seawater—U, V, Mo, and Ni. The high contents of Cu, Co, Se, Bi, Te, and values of Co/Ni ratios decrease in the range from unzoned euhedral pyrite to oscillatory-zoned and framboidal pyrite, as well as to colloform and crystalline marcasite. The trend of Co/Ni values indicates a change from hydrothermal to hydrothermal-diagenetic crystallization of the pyrite. The concentrations of Zn, As, Sb, Pb, Ag, and Tl, as commonly observed in pyrite formed from mid- and low-temperature fluids, decline with increasing crystal size of pyrite and marcasite. Coarse oscillatory-zoned pyrite crystals contain elevated Mn compared to unzoned euhedral varieties. Framboidal pyrite hosts maximum concentrations of Mo, U, and V probably derived from ocean water mixed with hydrothermal fluids. In the Pobeda SMS deposit, the position of microfacies changes from the black smoker feeder zone at the base of the ore body, to seafloor marcasite-pyrite from diffuser fragments in sulfide breccias. We suggest that the temperatures of mineralization decreased in the same direction and determined the zonal character of deposit.

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Uranium accumulation in modern and ancient Fe-oxide sediments: Examples from the Ashadze-2 hydrothermal sulfide field (Mid-Atlantic Ridge) and Yubileynoe massive sulfide deposit (South Urals, Russia)

Cited by 22 publications

References 39 publications

Authigenesis at the Urals Massive Sulfide Deposits: Insight from Pyrite Nodules Hosted in Ore Diagenites

Authigenesis at the Urals Massive Sulfide Deposits: Insight from Pyrite Nodules Hosted in Ore Diagenites

Mineralogy and geochemistry of metalliferous sedimentary rocks from the Upper Cretaceous VMS deposits of the Eastern Pontides (NE Turkey)

Pyrite Varieties at Pobeda Hydrothermal Fields, Mid-Atlantic Ridge 17°07′–17°08′ N: LA-ICP-MS Data Deciphering

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