Facial Composition, Geochemical Features and Geodynamic Settings of Formation of the Late Emsian Island Arc Complexes: the Main Urals Fault Zone, Southern Urals

Znamensky, S. E.; Kosarev, A. M.; Shafigullina, G.T.

doi:10.17072/psu.geol.18.1.1

Cited by 2 publications

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“…, Zr/Ti-Nb/Y (б) , (FeO + Fe 2 O 3 )/MgO-SiO 2 (в) (Miashiro, 1973), Zr-Y (г) (MacLean, и TiO 2 -MgO (д) for effusive and intrusive rocks. 1 -taxite gabbroids; 2 -dolerites, basalts, basaltic andesites; 3 -gabbro-dolerites, gabbro-diorites and diorites; 4 -the field of volcanic rocks of pyrite-bearing Baymak-Buribay complexes of the southern regions of the Magnitogorsk megazone (Znamenskii et al, 2019). a: 1 -basalts, 2 -basaltic andesites, 3 -andesites, 4 -trachybasalts, 5 -basaltic trachyandesites; б: 1 -subalkaline basalts, 2 -basalts and basaltic andesites, 3 -andesites, 4 -dacites and rhyodacites, 5 -alkaline basalts, 6 -trachyandesites.…”

Section: петро-и геохимическая характеристика породmentioning

confidence: 99%

“…3. (3) suites of the MUF zone Kosarev et al, 2005;Znamenskii, Michurin, 2013;Znamenskii et al, 2019).…”

Section: Fig 3 Diagrams (Namentioning

confidence: 99%

“…5. Diagrams Al 2 O 3 -TiO 2 (a) and Zr/Nb-Nb/Th (б) for basic rocks.1-3 -compositional fields of basalts from the Polyakovka (О 2 ) (1), Baimak-Buribay (D 1 e 2 ) (2) and Irendyk (D 2 ef) (3) suites of the MUF zoneKosarev et al, 2005;Znamenskii, Michurin, 2013;Znamenskii et al, 2019). In diagram "б" the composition fields of basalts: I -island arcs, II -MOR, III -oceanic plateaus, IV -oceanic islands.…”

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Voznesenskoe gold ore deposit (Southern Urals): Geological structure, ore-bearing rock geochemistry, geodynamic formation conditions

Znamensky

Znamenskaya

2022

Lithosphere

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Research subject. The geological structure, petro-geochem ical features of the ore-bearing rocks of the Voznesenskoe gold ore deposit (Southern Urals) and the geodynamic conditions of its formation. Methods. The content of petrogenic oxides was determined using silicate analysis; rare elements were determ ined using ICP-MS methods by an EIAH 9000 mass spectrometer and ICP-AES by an ICPE-9000 mass spectrometer. Results. The Voznesenskoe deposit is confined to a fragment of the crustal part of the section of harzburgite-type island-arc ophiolites. The ophiolite section is composed of taxite gabbroids, a sequence of dolerites, basalts, basaltic andesites and their tuffs, in places separated from gabbroids by lenses of serpentinites, and a package of subparallel dikes of porphyry gabbro-dolerites, gabbro-diorites, and diorites. Volcanics and dyke rocks with normal alkalinity and tholeiitic composition exhibit the geochemical characteristics of suprasubduction formations. In terms of chemical composition, they are comparable to the volcanic rocks of the pyritebearing complexes of the Baimak-Buribaevskaya Formation (D1e2). At the same time, the Voznesensky rocks have a number of distinct features, which are likely to be related to the geodynamic setting of their formation. In particular, ore-bearing effusive rocks and dykes differ from volcanic rocks of pyrite-bearing complexes in terms of a higher titanium content, the absence of boninite and silicic volcanic rocks, as well as the predominance of porphyry rock types. Conclusion. The conducted analysis of geochemical data using the V-Ti/1000 and LaN/SmN-TiO2 diagrams suggests that the association of mafic volcanic rocks and ore-bearing dykes of gabbro-dolerites, gabbro-diorites and diorites of the Voznesensky deposit was formed in the back-arc basin of the Late Ems frontal island arc.

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Section: петро-и геохимическая характеристика породmentioning

confidence: 99%

“…3. (3) suites of the MUF zone Kosarev et al, 2005;Znamenskii, Michurin, 2013;Znamenskii et al, 2019).…”

Section: Fig 3 Diagrams (Namentioning

confidence: 99%

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confidence: 99%

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Voznesenskoe gold ore deposit (Southern Urals): Geological structure, ore-bearing rock geochemistry, geodynamic formation conditions

Znamensky

Znamenskaya

2022

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Petrological and geochemical characteristic of the rocks of the Voznesensky intrusive massif (Southern Urals): Оn the question of the composition and sources of magma producing gold and copper porphyry mineralization

Znamensky

2021

Lithosphere

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Research subject. The petrological and geochemical features of the rocks of the Voznesensky intrusive massif and its dyke series were studied in order to clarify the composition, possible sources and geodynamic settings of magma generation that produced Au- and Cu-porphyry mineralization.Methods. The content of petrogenic oxides was determined by the chemical method, trace elements – by ICP-MS analysis.Results. Among the rocks of the Voznesensky massif, which have the geochemical characteristics of suprasubduction formations, varieties with calc-alkaline and adakite-like properties were established. The main phase of the massif is represented by gabbro-diorites and diorites belonging to the calc-alkaline series. Ore-bearing dykes of gabbro-diorites, diorites and granodiorites of the Au-porphyry Bolshekaransky deposit are of calc-alkaline composition, while the post-ore dykes of granodiorites and plagiogranites of this deposit exhibit adakite-like characteristics.Conclusions. The ore-bearing dyke series of the Voznesensky deposit is represented by calc-alkaline diorites and adakite-like granodiorites and plagiogranites. The metallogenic specialization of the dykes was influenced by the silicic acidity and the redox state of the ore-generating melts. Granitoids with Cu-porphyry mineralization, compared to their gold-bearing varieties, crystallized from more acidic melts with a higher degree of oxidation. It is assumed that the main mantle component of magmas for the Voznesensky rocks were relatively weakly depleted spinel peridotites of the suprasubduction lithospheric mantle. Calc-alkaline magmas were melted from a mantle substrate previously metasomatized by aqueous fluids, and magmas with adakite-like properties – metamorphosed by melts of basalts and sedimentary rocks of slab. Melting of slab rocks may have been associated with additional heating due to friction caused by changes in direction and/or velocity of oblique subduction.

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Facial Composition, Geochemical Features and Geodynamic Settings of Formation of the Late Emsian Island Arc Complexes: the Main Urals Fault Zone, Southern Urals

Cited by 2 publications

References 3 publications

Voznesenskoe gold ore deposit (Southern Urals): Geological structure, ore-bearing rock geochemistry, geodynamic formation conditions

Voznesenskoe gold ore deposit (Southern Urals): Geological structure, ore-bearing rock geochemistry, geodynamic formation conditions

Petrological and geochemical characteristic of the rocks of the Voznesensky intrusive massif (Southern Urals): Оn the question of the composition and sources of magma producing gold and copper porphyry mineralization

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