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)

2018 ◽  
Vol 367 ◽  
pp. 164-174 ◽  
Author(s):  
N.R. Ayupova ◽  
I.Yu. Melekestseva ◽  
V.V. Maslennikov ◽  
A.S. Tseluyko ◽  
I.A. Blinov ◽  
...  
Keyword(s):  
Massive Sulfide ◽  
Sulfide Deposit ◽  
South Urals ◽  
Massive Sulfide Deposit ◽  
Fe Oxide ◽  
Hydrothermal Sulfide ◽  
Mid Atlantic Ridge ◽  
Uranium Accumulation

Gossan of the Yubileinoe Massive Sulfide Deposit (South Urals): Evidence for Formation on the Seafloor

2019 ◽  
Vol 54 (1) ◽  
pp. 66-78 ◽  
Author(s):  
K. A. Novoselov ◽  
E. V. Belogub ◽  
S. A. Sadykov ◽  
I. V. Vikentyev
Keyword(s):  
Massive Sulfide ◽  
Sulfide Deposit ◽  
South Urals ◽  
Massive Sulfide Deposit

scholarly journals Mineralogical and geochemical features of pyrite nodules of sulfide turbidites from the Talgan Cu–Zn massive sulfide deposit (South Urals)

2019 ◽  
pp. 518-539
Author(s):  
N. R. Ayupova ◽  
V. V. Maslennikov ◽  
D. A. Artemyev ◽  
I. A. Blinov
Keyword(s):  
Trace Element ◽  
Host Rock ◽  
Inner Core ◽  
Outer Zone ◽  
Massive Sulfide ◽  
Intermediate Zone ◽  
Sulfide Deposit ◽  
South Urals ◽  
Massive Sulfide Deposit ◽  
The Core

Pyrite nodules were found in thin-layered sulfide ores localized at the flanks of the Talgan Cu‒Zn massive sulfide deposit (South Urals). The nodules consist of (1) an inner core of microgranular pyrite with inclusions of authigenic sulfides and host rock minerals, (2) an intermediate zone of anhedral and subhedral pyrite metacrystals, (3) an outer zone formed by parallel subhedral pyrite crystals and (4) dioctahedral chlorite rimming the pyrite crystals of zone 3. Each zone exhibits specific trace element association, which is identified using LA ICP-MS micromapping. The trace element content of pyrite significantly (by 13 orders of magnitude) decreases in a range of microgranular pyrite of the core an- and subhedral pyrite crystals of the intermediate zone subhedral pyrite crystals of the outer zone (average values, ppm): 131069 Zn, 241001783 Pb, 1323134 As, 10271.81 Co, 4564 Ni, 39038 Ag, 0.10.01 Au, 550.6 Te, 9.80.6 Bi. The subhedral pyrite crystals of the outer zone are enriched (ppm, up to) in Cu (8367), Sb (1627) and Mn (734) relative to microgranular pyrite of the core. The extremely high trace element contents are related to the inclusions of authigenic chalcopyrite, sphalerite, fahlore, gold and silver minerals. The host rock components of the nodules include quartz, calcite, chlorite, illite and REE minerals. The ore clasts of distal sulfide turbidites mixed with hyaloclastites, which were altered during dia- and anadiagenesis, were the source of ore material for the nodules.

scholarly journals Mineralogical and geochemical evidenceof contact transformation of Dzhusа base metal massive sulfide deposit (South Urals)

2017 ◽  
pp. 39-44
Author(s):  
E. I. Yartsev ◽  
I. V. Vikentyev ◽  
V. Yu. Prokofiev
Keyword(s):  
Regional Metamorphism ◽  
Massive Sulfide ◽  
Homogenization Temperature ◽  
Sulfide Deposit ◽  
South Urals ◽  
Contact Transformation ◽  
Massive Sulfide Deposit ◽  
High Concentration ◽  
Thermal Metamorphism ◽  
Ore Minerals

Dzhusа volcanogenic massive sulfide deposit is characterized by a high concentration of dykes of basic and intermediate rocks. Thermal metamorphism of ore and recrystallization of ore minerals were caused by formation of post-ore dykes. It was shown that homogenization temperature regular increased from 156 °С at a distance of the dyke to 287-305 °С in its contact zone. Highly saline (6,4-15,7 wt.% eq. NaCl) water fluids saturated with CO2 suggest high pres- sure conditions (up to 1500 bars) and can result from contact and regional metamorphism.

scholarly journals U-Th-He dating of pyrite from the Uzelga Copper-Zinc massive sulfide deposit (South Urals, Russia): first application of a new geochronometer

2019 ◽  
Vol 485 (6) ◽  
pp. 708-712
Author(s):  
O. V. Yakubovich ◽  
I. V. Vikentyev ◽  
O. V. Zarubina ◽  
N. V. Bryanskiy ◽  
B. M. Gorokhovskii ◽  
...  
Keyword(s):  
Crystal Lattice ◽  
Measurement Errors ◽  
Massive Sulfide ◽  
Age Dating ◽  
Sulfide Deposit ◽  
South Urals ◽  
Massive Sulfide Deposit ◽  
Ore Mineralization ◽  
Copper Zinc ◽  
Dating Method

Based on a study of pyrite from the Uzelga Cu-Zn volcanogenic massive sulfide (VMS) deposit (South Urals) the age of ore mineralization was first determined with the direct age-dating method, based on the fraction of radiogenic helium, incorporated into the pyrite crystal lattice from submicron inclusions of U and Th minerals. Taking into account the measurement errors, the obtained age of 377 ± 8 Ma (MSWD = 1.2) is quite consistent with the independent age dates available for the ore mineralization (Late Eifelian-Early Givetian, 385-390 Ma).

scholarly journals Gossan of the Yubileynoe massive sulfide deposit (South Urals): evidence for formation on the seafloor

2019 ◽  
Vol 1 (1) ◽  
pp. 90-100
Author(s):  
K. A. Novoselov ◽  
E. V. Belogub ◽  
S. A. Sadykov ◽  
I. V. Vikentyev
Keyword(s):  
Organic Matter ◽  
Isotope Composition ◽  
Massive Sulfide ◽  
Carbon Isotope Composition ◽  
Oxidation Zone ◽  
Sulfide Deposit ◽  
South Urals ◽  
Massive Sulfide Deposit ◽  
Fermentation Products ◽  
Plant Remains

Oxidation zone of the Yubileinoe massive sulfide deposit, South Urals, is buried beneath Jurassic sediments containing coalified plant remains. Mineralogy of gossan of this deposit is marked by the abundance of siderite. The carbon isotope composition (δ13C) in siderite varies from -20.0 to -23.4‰ PDB, which is close to δ13C variation in coals from the overlying sediments (-23.5 to -26.2‰ PDB). The formation of siderite is likely related to interaction between solutions of the Triassic oxidation zone and fermentation products of the organic matter.

scholarly journals Trace-elements in sulfides of the Dergamysh cobalt-bearing massive sulfide deposit, the Southern Urals: Mode of occurrence and matter sources

LITOSFERA ◽  
2020 ◽  
Vol 20 (4) ◽  
pp. 499-516
Author(s):  
I. Yu. Melekestseva ◽  
V. V. Maslennikov ◽  
S. P. Maslennikova
Keyword(s):  
Trace Elements ◽  
Inductively Coupled Plasma ◽  
Massive Sulfide ◽  
Sulfide Deposit ◽  
South Urals ◽  
Massive Sulfide Deposit ◽  
The Southern Urals ◽  
Diagenetic Alteration ◽  
Ore Body ◽  
Mode Of Occurrence

Subject of study. The article presents the results of study of trace elements (TEs) in sulfides of the main ore body (borehole 1T) and the northwestern ore body (borehole 200) of the Dergamysh cobalt-bearing massive sulfide deposit hosted in serpentinites (South Urals). Materials and methods. The chalcopyrite-pyrite-marcasite sandstones of the main ore body and pyrite-chalcopyrite-pyrrhotite “gravelites” of its northwestern satellite were studied with laser ablation with inductively coupled plasma. Results. The TE contents, distribution and mode of occurrence differ in sulfides of the main ore body and its northwestern satellite. In ores of the main ore body, most TEs (Ag, Sn, Mn, As, Co, Ni, Te, Pb, Au) accumulate in pyrite-1, pyrite-marcasite aggregates concentrate Tl and Bi, marcasite is a host to Mo and Sb, and chalcopyrite contains Zn, Se and Cd. Pyrite-2 is depleted in TEs relative to other sulfides. In sulfides of the northwestern satellite, most TEs are related to chalcopyrite (Bi, Te, Zn, Cd, Se, Pb, Au, Tl, Ni, Co). Tin accumulates in cubanite, As and Ni are hosted in pyrite-4, Ag, Mn and Mo are concentrated in pyrrhotite, Sb is typical of pyrite-3, and Co accumulates in pyrite-2. Conclusions. Based on the correlation analysis, it is shown that sulfides of the main ore body and its northwestern satellite are characterized by different mode of TE occurrences. The differences are explained by two main reasons: 1) “mafic” and “ultramafic” metal sources for sulfides of the main ore body and its northwestern satellite, respectively, and 2) different degree of diagenetic alteration of sulfides.

FACTORS OF LOCALIZATION AND PREDICTION OF MINERALIZATION IN DZHUSA MASSIVE SULFIDE DEPOSIT (SOUTH URALS)

2018 ◽  
pp. 48-58
Author(s):  
E. I. Yartsev ◽  
A. A. Burmistrov ◽  
I. V. Vikentyev
Keyword(s):  
Tectonic Evolution ◽  
Block Diagram ◽  
Massive Sulfide ◽  
Island Arc ◽  
Open Pit ◽  
Sulfide Deposit ◽  
South Urals ◽  
Massive Sulfide Deposit ◽  
Ore Bodies ◽  
Ore Mineralization

Analysis of tectonic displacements along fractures and faults enabled to reveal changes in character of tectonic deformations resulted from tectonic evolution of the Magnitogorsk island arc. Structural conditions of localization of ore mineralization of various types were investigated in the open pit of the Dzhusa deposit. The ore shoot on block diagram of the deposit coincides with intersection of NW-trending and sublongitudinal faults. Trends in distribution of enriched mineralization are slightly different for various metals. The data obtained enable to predict position of rich ore bodies at deeper levels of the deposit and help in prospecting for new deposits in the Terensai ore field.

scholarly journals Tellurium-bearing minerals in clastic ores of Ybileynoe massive sulfide deposit (South Urals)

2019 ◽  
Vol 61 (2) ◽  
pp. 39-71
Author(s):  
A. S. Tseluyko ◽  
V. V. Maslennikov ◽  
N. R. Ayupova ◽  
S. P. Maslennikova ◽  
L. V. Danyushevsky
Keyword(s):  
Solid Solution ◽  
Massive Sulfide ◽  
Sulfide Deposit ◽  
South Urals ◽  
Massive Sulfide Deposit ◽  
Black Smoker ◽  
Fine Grained ◽  
Intermediate Solid Solution ◽  
Sedimentation Processes

At the well preserved Yubileynoe VMS deposit (South Urals), sulfide breccias and turbidites contain abundant tellurides represented by hessite, coloradoite, altaite, volynskite, stutzite, petzite, calaverite as well as phases of intermediate solid solution tellurobismuthite – rucklidgeite. There is three generation of tellurides were highlighted: 1) primary hydrothermal tellurides in the fragments of chalcopyrite and sphalerite of chalcopyrite-rich black smoker chimneys; 2) authigenic tellurides in pseudomorphic chalcopyrite and veins of chalcopyrite after fragments of colloform and granular pyrite; 3) authigenic tellurides in pyrite nodules. Authigenic tellurides are widespread in pyrite-chalcopyrite turbidites. In sulfide turbidites and gravelites with fragments of sphalerite-pyrite, pyrite-sphalerite paleosmoker chimneys and clasts of colloform and fine-grained seafloor hydrothermal crusts, primary hydrothermal and authigenic tellurides are less common. Siliceous siltstones intercalated with sulfide turbidites contain pyrite nodules, which peripheral parts contain inclusions of epigenetic tellurides. It is assumed that the source of tellurium for authigenic tellurides were fragments of colloform pyrite and hydrothermal chalcopyrite of pyrite-chalcopyrite chimneys, which dissolved during post-sedimentation processes. The main concentrators of tellurium in clastic ores are pseudomorphic chalcopyrite, which inherits high contents of Te, Bi, Au, Ag, Co, Ni, As from the substituted colloform pyrite, and varieties of granular pyrite, containing microinclusions of tellurobismuthite (Bi, Te), petzite (Au, Ag, Te), altaite (Pb, Te), coloradoite and hessite (Ag, Te).

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