Paleozoic Granitoid Magmatism of the Urals: The Reflection of the Stages of the Geodynamic and Geochemical Evolution of a Collisional Orogen

Kholodnov, V. V.; Шардакова, Г. Ю.; Puchkov, V. N.; Петров, Г. А.; Shagalov, E. S.; Salikhov, D. N.; Korovko, A. V.; Прибавкин, С. В.; Рахимов, И. Р.; Borodina, N. S.

doi:10.5800/gt-2021-12-2-0522

Cited by 9 publications

(2 citation statements)

References 36 publications

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“…Average compositions of rocks: 1-3 -basalts FZ, PZ, TZ; 4-6 -basaltic andesites and andesites of the same zones; 7 and 8 -felsic volcanics FZ and TZ. The limit value of Y/Nb for the index between island arcs and similar continental margins is 5.0 (Kholodnov et al, 2021). Постаккреционный ивдельский габбро-долерит-монцонит-гранодиоритовый комплекс…”

Section: Figmentioning

confidence: 95%

Mineralogy, fluid regime and potential ore content of the post-accretion Ivdel gabbrodolerite-monzonite-granodiorite complex (Northern Urals)

Kholodnov,

Shagalov,

Petrov

2024

Lithosphere

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Research subject. Hypabyssal intrusive bodies of a gabbro-dolerite-monzonite-granodiorite composition, common among the Devonian island-arc sequences of the East Tagil structural-formational zone in the Northern Urals. These bodies are dated as the Late Devonian-Early Carboniferous and attributed to the post-accretionary continuously differentiated Ivdel complex. Material and methods. The composition of rock-forming and accessory minerals of these intrusive bodies was studied using an SX-100 microanalyzer. This made it possible to obtain new data on the conditions of their formation, features of the fluid regime, and potential ore content. In addition, the geodynamic setting of this period was clarified, along with the composition, possible position of the primary mantle source, and the features of its fluid regime. Results. It was established that the mafic rocks (dolerites) in the Ivdel complex correspond to derivatives of the depleted mantle, with a primary source close to N-MORB basalts. The connection between the source and the separation of the slab and the “mantle window” located under the frontal zone of the former East Tagil island arc was substantiated. Such a position of the melting chamber determines the primary weak water saturation of dolerite magmas and their redox regime. According to mineralogical data, this feature is further manifested in the formation of the entire series of rocks of the Ivdel complex (with an increase in the iron index of clinopyroxenes and amphiboles, an increase in titanium contents in titanomagnetite, and other data). Further evolution of magmas (from dolerites to monzonites, quartz diorites, and granodiorites) occurred as they moved upward to the Earth’s surface and reflected the increasing contamination of differentiated melts by suprasubduction island-arc matter. Another important petrological feature of this complex is its formation with the participation of a chlorine-rich magmatogenic fluid. Depending on the composition of intruding melts, their contents of water, chlorine and oxygen activity, a number of autonomous degassing fluid-magmatic systems are formed. These systems are characterized by noticeable features in the processes of post-magmatic autometasomatosis, with the participation of an iron-chloride fluid. According to the regime of volatiles (halogens, water, and oxygen), the common affiliation of such autonomous fluid-magmatic systems to titanomagnetite ferrofacies (according to G.B. Fershtater), determines both their general metallogenic specialization and potential ore content. The removal of volatiles from such fluid-magmatic systems could be accompanied by extraction and transfer of chlorophyll ore elements from crystallizing melts to exocontacts of intrusive bodies. This, in the presence of migration zones favorable for fluids (faults, crushing zones, etc.) and geochemical barriers (especially in the presence of favorable enclosing sulfide-bearing island-arc strata), could have contributed to the formation of hydrothermal-metasomatic ore mineralization (Cu, Zn, Au, Mo and etc.). Such ore-bearing zones during erosion could be the primary source of gold for the known placers of this region. Large bodies of gabbrodolerites of the Ivdel complex may be promising for high-Ti magnetite-ilmenite mineralization.

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Section: Figmentioning

confidence: 95%

Mineralogy, fluid regime and potential ore content of the post-accretion Ivdel gabbrodolerite-monzonite-granodiorite complex (Northern Urals)

Kholodnov,

Shagalov,

Petrov

2024

Lithosphere

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“…8. Generalized Y-Nb diagram for the main geodynamic types of Ural granitoids (Riphean-Triassic), modified after(Kholodnov et al, 2021).…”

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confidence: 99%

New data on the trace element composition and Lu-Hf isotopic system of zircons from the Early Cambrian granites of the Ufaley block (Middle Urals): a step to the correction of geodynamic concepts

Shardakova

2022

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Research subject. Composition and isotopic parameters of zircons and their host granites of the Bitim complex, localised in the eastern part of the Ufaley block (Middle Urals).Materials and methods. The determination of trace element composition and Lu-Hf isotope system in zircons was carried out by LA-ICP-MS (the “Geoanalitik” shared research facilities of the IGG UB RAS, Ekaterinburg).Results and conclusions. The images and geochemical features of the main zircon population from granites confirm their magmatic genesis and minimal alteration, which proves previously defined Vendian- Cambrian (520 ± 9 Ma) age for the granites. Younger zircons (401–459 Ma) differing in composition from the older ones, were formed during subsequent tectonic-thermal activity, possibly under the fluid action. The mixed mantle-crustal nature of substrate for the granite melting is indicated by specific isotopic parameters (87Sr/86Sr = 0.703389, εHf(t)aver = +6.3) and a number of characteristic ratios for zircons and granites. The geodynamic concepts of the granite formation settings of the Bitim complex are corrected: in the Vendian–Early Cambrian, a transform-type margin has developed in this sector, the divergent movements on which have been accompanied by a break in the continuity of the crust and the intrusion of a deep mantle diapir; the participation of the slab substance in the magma generation might also be assumed.Conclusions. The results obtained can be used for the geological mapping and correction of a general geodynamic scheme for the junction zone between the Ural Mobile Belt and the East European platform.

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Quartz Diorites of the Volkovsky Ore-Bearing Massif (Middle Urals, Russia): U–Pb Age, Nd–Sr–Pb Isotope Systematics, Geochemical Features, Petrogenetic, and Geodynamic Consequences

Anikina,

Kudryashov,

Soloshenko

et al. 2024

Geochem. Int.

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Paleozoic Granitoid Magmatism of the Urals: The Reflection of the Stages of the Geodynamic and Geochemical Evolution of a Collisional Orogen

Cited by 9 publications

References 36 publications

Mineralogy, fluid regime and potential ore content of the post-accretion Ivdel gabbrodolerite-monzonite-granodiorite complex (Northern Urals)

Mineralogy, fluid regime and potential ore content of the post-accretion Ivdel gabbrodolerite-monzonite-granodiorite complex (Northern Urals)

New data on the trace element composition and Lu-Hf isotopic system of zircons from the Early Cambrian granites of the Ufaley block (Middle Urals): a step to the correction of geodynamic concepts

Quartz Diorites of the Volkovsky Ore-Bearing Massif (Middle Urals, Russia): U–Pb Age, Nd–Sr–Pb Isotope Systematics, Geochemical Features, Petrogenetic, and Geodynamic Consequences

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