Structural controls of lode-gold mineralization by mafic dykes in late-Paleozoic granitoids of the Kochkar district, southern Urals, Russia

Kisters, Alexander F. M.; Meyer, Franz Michael; Znamensky, S. E.; Seravkin, I. B.; Ertl, R. G. W.; Kosarev, A. M.

doi:10.1007/s001260050013

Cited by 19 publications

(5 citation statements)

References 13 publications

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“…Archean mesothermal gold deposits such as Boddington (Allibone et al 1998), Paleozoic lode-gold systems such as Kochkar (Kisters et al 2000), regionally metamorphosed deposits like Clogau, Iilijärvi and Fragant, and skarn systems (Ardino) all fall in this category.…”

Section: Genetic Considerationsmentioning

confidence: 97%

COMPOSITIONAL DATA FOR Bi-Pb TELLUROSULFIDES

Cook¹,

Ciobanu²,

Stanley³

et al. 2007

The Canadian Mineralogist

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Compounds containing essential Bi, Pb, Te and S are rare in nature. Aleksite, PbBi 2 Te 2 S 2 , is known from less than ten localities worldwide, and the single other recognized mineral, saddlebackite, Pb 2 Bi 2 Te 2 S 3 , is known only from the type locality, the Boddington Au deposit, Western Australia. Another phase, unnamed PbBi 4 Te 4 S 3 , had earlier been recognized as homogeneous grains and lamellar intergrowths within an assemblage consisting of aleksite, tellurobismuthite and tetradymite from St. David's mine, Clogau, Wales, U.K. Re-investigation of this assemblage, including careful micro-analysis to avoid obvious intergrowths of phases, reveals an almost continuous range of compositions between tetradymite and aleksite. Investigations of complex sulfosalt-telluride assemblages from Iilijärvi, a satellite deposit within the Orijärvi orefield, southwest Finland, have revealed compositions approximating to the range Pb 5 Bi 4 Te 4 S 7 -Pb 7 Bi 4 Te 4 S 9 . These occur as fine intergrowths, rarely as larger single lamellae, also with aleksite, within a matrix of giessenite, galena and cosalite. The samples contain abundant gold, seen also as symplectite intergrowths with rutile. Investigation of the microparagenesis of precious-metal-bearing galena -chalcopyrite -pyrite mineralization in quartz veins at Fragant ("Langenleiten"), Carinthia Province of Austria, revealed the presence of several compositionally different Bi-Pb tellurosulfides. Aleksite is the most abundant, followed by unnamed phases with compositions close to Pb 3 Bi 4 Te 4 S 5 , Pb 5 Bi 4 Te 4 S 7 and Pb 6 Bi 4 Te 4 S 8 . They occur as inclusions in galena and are variably associated with sulfosalts such as lillianite, cosalite, felbertalite and aikinite. The compositional dataset from the above occurrences is difficult to interpret § Part 3 418 the canadian mineralogist without accompanying structural data. The data, however, suggest the existence of an incremental chemical series with the general formula Pb N Bi 4 Te 4 S N+2 . Alternatively, these are not discrete, essentially immiscible phases within a chemically defined modular series, but are simply compositions across a continuous compositional series. If the existence of a series can be proven, tetradymite, Bi 4 Te 4 S 2 , would correspond to N = 0, unnamed PbBi 4 Te 4 S 3 , to N = 1, aleksite, to N = 2, unnamed Pb 3 Bi 4 Te 4 S 5 , to N = 3, and saddlebackite, to N = 4, where the N values reflect chemical composition, rather than structurally defined homologous order. Indirect support for such a hypothesis comes from the recognition in the literature of four phases (N = 1, 2, 3 and 4) as synthetic products (phases D, E, F and J) obtained at 500 °C. The unnamed phases from Iilijärvi and Fragant may correspond to unspecified higher members of the same series. The lamellar banding with galena and tetradymite, and extended compositional fields observed in the Clogau and Iilijärvi specimens, are highly reminiscent of similar issues in Bi-sulfosalt series, allowing us to speculate that we...

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Section: Genetic Considerationsmentioning

confidence: 97%

COMPOSITIONAL DATA FOR Bi-Pb TELLUROSULFIDES

Cook¹,

Ciobanu²,

Stanley³

et al. 2007

The Canadian Mineralogist

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“…The stress field will locally have changed at the contacts between the schist and the marbles (compare Kisters et al, 2000). The location of the Upper Schist area at the periphery of the dome has further exposed this unit to higher strain during rotation of the dome.…”

Section: Accepted Manuscriptmentioning

confidence: 97%

The Relationship between the Structural Orientation and the Gold Mineralisation of Quartz-Sulphide Veins in the Navachab Gold Deposit, Namibia

Wulff

Steven

Hein

et al. 2017

Ore Geology Reviews

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“…Gold mineralization is associated with tabular quartz lodes that are preferentially developed along the margins of easterly trending mafic dykes (Kisters et al 2000). Deformation and formation of associated gold-quartz lodes occurred close to the peak of metamorphism at conditions of the upper-greenschist to lower-amphibolite facies.…”

Section: Occurrencementioning

confidence: 99%

“…Deformation and formation of associated gold-quartz lodes occurred close to the peak of metamorphism at conditions of the upper-greenschist to lower-amphibolite facies. Fracturing in the gneissic rocks promoted the access of mineralizing fluids (Kisters et al 2000). Both ore-controlling dykes and gold-quartz lodes were subsequently overprinted by lower greenschist-facies assemblages, and an associated hydrothermal alteration postdated the gold mineralization.…”

Section: Occurrencementioning

confidence: 99%

THE CRYSTAL STRUCTURE OF SKIPPENITE, Bi2Se2Te, FROM THE KOCHKAR DEPOSIT, SOUTHERN URALS, RUSSIAN FEDERATION

Bindi¹,

Cipriani²

2004

The Canadian Mineralogist

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Skippenite, Bi 2 Se 2 Te, was found in a sample from the Kochkar deposit, southern Urals, Russian Federation. The sample forms part of the mineralogical collection of the Natural History Museum of the University of Florence. Electron-microprobe analyses gave the chemical formula (Bi 2.06 Cu 0.05 Sb 0.03 ) ⌺2.14 Se 2.00 (Te 0.89 S 0.11 ). The mineral occurs as anhedral grains up to 0.3 mm across. Skippenite is steel-grey in color, shows a black streak, and has a perfect basal cleavage. In reflected light, the mineral is greyish white, weakly bireflectant, nonpleochroic, moderately anisotropic in yellowish tints. Reflectivity values (R min and R max , in %) are 47.

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Structural controls of lode-gold mineralization by mafic dykes in late-Paleozoic granitoids of the Kochkar district, southern Urals, Russia

Cited by 19 publications

References 13 publications

COMPOSITIONAL DATA FOR Bi-Pb TELLUROSULFIDES

COMPOSITIONAL DATA FOR Bi-Pb TELLUROSULFIDES

The Relationship between the Structural Orientation and the Gold Mineralisation of Quartz-Sulphide Veins in the Navachab Gold Deposit, Namibia

THE CRYSTAL STRUCTURE OF SKIPPENITE, Bi2Se2Te, FROM THE KOCHKAR DEPOSIT, SOUTHERN URALS, RUSSIAN FEDERATION

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