New age datings of gabbroides of the Kershor complex (Polar Urals)

Remizov, D. N.; Grigoriev, Serguej; Petrov, S. Yu.; Kos’yanov, A. O.; Nosikov, M. V.; Сергеев, С. А.

doi:10.1134/s1028334x10090205

Cited by 13 publications

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“…In the geological aspect, the Dzelyatyshor massif is surrounded by the Voykar-Synya dunite-harzburgite ophiolite massif, which occurs in the polar part of the Main Uralian fault zone (Figure 1). The rocks of the northeastern framing of this massif belong to the Karshor peripheral striped dunite-wehrlite-clinopyroxenite-gabbro complex, whose age is determined as Late Ordovician [12]. In the southeast, the Karshor complex borders granitoids of the Sobsky granodiorite-tonalite complex (D 1-2 ).…”

Section: Brief Description Of the Study Areamentioning

confidence: 97%

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The Gold–Palladium Ozernoe Occurrence (Polar Urals, Russia): Mineralogy, Conditions of Formation, Sources of Ore Matter and Fluid

et al. 2022

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We studied the mineralization and sulfur isotopic composition of sulfides of gold–palladium ores in olivine clinopyroxenites from the Dzelyatyshor massif made up of a continuous layered series of rocks: olivine-free clinopyroxenite–olivine clinopyroxenite–wehrlite. The primary igneous layering of rocks, manifested as different quantitative ratios of clinopyroxene and olivine in them, controls the local trends of variability in the chemistry of mineral-forming medium and the concentrations of ore components, including noble metals, and sulfur in each separate layer during its cooling. The replacement of primary rock-forming minerals by secondary minerals, when the temperature decreases, is a characteristic trend for pyroxenites: (a) olivine → serpentine, secondary magnetite, and (b) clinopyroxene → amphibole, secondary magnetite → chlorite. The deposition of native gold in parageneses with PGM and sulfides at the Ozernoe occurrence took place during the replacement of earlier rock-forming minerals by chlorite. This process completed mineral formation at the deposit and took place at temperatures 150–250 °С and at the high activity of S, Te, Sb, and As of fluid. The variability of mineral formation conditions during chloritization is reflected in the change of native-sulfide forms of Pd by arsenide-antimonide forms and the sulfur isotopic composition of sulfides. The Pd content in native gold increases in the series—Au-Ag solid solution (<1.5 wt.% Pd)—Au-Cu intermetallides (to 6 wt.% Pd)—Cu-Au-Pd solid solutions (16.2–16.9 wt.% Pd). The sulfur isotopic composition of pyrite, chalcopyrite, and bornite varies from −2.1 to −2.9‰. It is assumed that a deep-seated magmatic basic melt was the source of fluid, ore components, and sulfur.

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Section: Brief Description Of the Study Areamentioning

confidence: 97%

“…The composition of Ag-Au particles (Ag 0.76-0.90 Au 0.1-0.24 ) corresponds to fineness 170-240‰. The composition of copperpalladium sulfide is calculated for the formula of (Pd,Cu,Fe) 2 S not described in literature (Table 10, No 12).…”

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confidence: 99%

The Gold–Palladium Ozernoe Occurrence (Polar Urals, Russia): Mineralogy, Conditions of Formation, Sources of Ore Matter and Fluid

et al. 2022

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“…Four main elements are recognized in the Voikar-Synya massif: (1) dunite-harzburgite complex, (2) banded dunite-wehrlite-pyroxenite-gabbro com plex, (3) Lagorta Complex of isotropic taxitic gabbro and dolerite dikes, and (4) gabbronorite complex [36,37,45,46,57]. The first three complexes belong to the ophiolitic section.…”

Section: Dike Complex In Ophiolites Of the Polar Uralsmentioning

confidence: 99%

“…Gabbroic rocks of the banded com plex of ophiolites are subdivided into early Trubayu and late Kershor complexes [45]. Remizov [36] regards them as rocks of the Kershor Complex. No lava (vol canic-sedimentary) complex is known in this ophi olitic association.…”

Section: Dike Complex In Ophiolites Of the Polar Uralsmentioning

confidence: 99%

Dike complexes in ophiolites of the Urals

2015

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The structure of dike complexes and their relationships with country rocks are considered for ophiolitic sections of the Polar and the Southern Urals. It has been established that composition of country rocks intruded by dikes is related to geodynamic settings of spreading. The Ordovician dike complexes of the Polar Urals and the Early Devonian complexes in the Southern Urals formed in the prearc setting contain screens of mantle, lower crustal, and upper crustal rocks pertaining to the ophiolitic section. The Late Sil urian-Early Devonian complex of dikes and volcanic rocks in the Aktau-Tanalyk Zone of the Southern Urals was formed in the course of rifting in an island arc structure. Rocks intruded by dikes are represented by island arc gabbro, plagiogranite, and calc alkaline volcanics. The Early-Middle Devonian dike complex of the West Mugodzhary Zone and the Early Devonian complex of the Dombarovsky Zone in the Southern Urals were formed in spreading zones of backarc basins, where dikes intruded the upper crustal gabbro and volcanic rocks.

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