scholarly journals Parautochthonic paleooceanic and island-arc complexes of the Southern Urals

LITOSFERA ◽  
2020 ◽  
Vol 20 (4) ◽  
pp. 542-556
Author(s):  
V. G. Korinevsky
Keyword(s):  
Deep Structure ◽  
Southern Urals ◽  
Island Arc ◽  
The Urals ◽  
The Southern Urals ◽  
Early Devonian ◽  
Middle Ordovician ◽  
Sedimentary Deposits ◽  
Middle Paleozoic ◽  
Structural Zones

Research objects. Paleozoic (Ordovician–Middle Devonian) volcanic-sedimentary complexes of the contiguous Sakmara and Mugodzharskaya structural zones of the Southern Urals, which have a paleo-oceanic and island-arc nature. Мaterials and methods.The work was carried out on the basis of many years of personal research of the author with the involvement of literature data on other folded zones of the Southern Urals. Main results. In the early Devonian, the first intense clustering of different facies complexes of rocks took place, which determined the tectonic face of the modern western part of the fold belt. The uniformity and set of Paleozoic formations in all structures of the Urals are maintained along its entire strike and are not repeated in neighboring zones.The drilling data showed the primary character of bedding of the rocks of the Upper Devonian Zilair Formation on the dislocated volcanogenic-sedimentary deposits of the Lower-Middle Paleozoic. Thrust contacts are observed only in the marginal parts of the zone. The almost textbook views on the cover bedding of the Kraka and Kempirsai hyperbasite massifs are in contradiction with the data on the presence of “roots” up to 4–8 km deep in them. By the beginning of the Devonian, the Kempirsai massif was located within the Sakmara zone and was “cross-linked” with the surrounding effusive rocks of the Middle Ordovician by gabbro-diabase dykes. According to the results of seismometric studies, features of similarity of the deep structure of the base of the Sakmara zone with the structure of the Magnitogorsk-Mugodzharskaya zone, which also revealed a melanocratic basement, have been established. Conclusions. The formed structural zones of the Southern Urals are distinguished by a set of rocks of the same age, their stratigraphic range, and the autonomy of feeding areas. These differences have survived to this day. All subsequent tectonic episodes, including the sharpening epochs, only complicated the appearance and structure of the Southern Urals, without changing the relative position of structures that arose in the Early Devonian. There was no transfer, swarming of rocks from one zone through another in any of the subsequent stages of compression. The Early Devonian stage was the first, but at the same time the most intense, which determined the tectonic face of the modern western part of the Urals.

scholarly journals Latitudes of the Eastern Ural microcontinent and Magnitogorsk island arc in the Paleozoic Ural Ocean

LITOSFERA ◽  
2020 ◽  
Vol 20 (6) ◽  
pp. 842-850
Author(s):  
V. S. Burtman ◽  
A. V. Dvorova ◽  
S. G. Samygin
Keyword(s):  
Middle Devonian ◽  
Volcanic Belt ◽  
Early Carboniferous ◽  
Southern Urals ◽  
Island Arc ◽  
Middle Urals ◽  
The Southern Urals ◽  
Tectonic Zone ◽  
Middle Ordovician ◽  
The Baltic

Research subject. Rocks of the Paleozoic Eastern Ural microcontinent and Magnitogorsk island arc occupy a significant part of the Southern Urals and some part of the Middle Urals. The Western Urals are composed of rocks of the ancient Baltic continent and overthrust oceanic rocks. In the Eastern Urals and Trans-Urals rocks of the accretion complexes, oceanic crust, island arcs, the Eastern Ural microcontinent and the Kazakhstan Paleozoic continent are widespread. Rocks are exposed in the Denisov tectonic zone. The Magnitogorsk simatic Island Arc originated in the Ural Ocean, near the Baltic continent, in the early Devonian, developing from the Emsian to the Famennian. A collision between the Magnitogorsk arc and the Baltic continent occurred in the Famennian century. In the pre-Carboniferous age, the Eastern Ural microcontinent was located in the Ural Ocean. In the Tournaisian period, the Eastern Ural microcontinent accreted with the Baltic continent. The Kazakhstan continental massif was located on the other side of the Ural Ocean. The volcanic belt above the subduction zone was active on the edge of the Kazakhstan continent in the Early–Middle Devonian and in the Early Carboniferous. A subduction under the Baltic and Kazakhstan continents consumed most of the crust of the Ural Ocean by the middle of the Bashkir century. As a result, the Baltic continent (together with the Eastern Ural microcontinent) came into contact with the Kazakhstan continent. The formation of folded orogen began in the Moscow century following the collision of sialic terrains.Materials and methods. The research was based on the relevant data obtained by several researchers in 2000–2018 on rock paleomagnetism. Results. The paleolatitudinal positions of the Eastern Ural microcontinent were determined, comprising 5.3 ± 7.4°) in the Middle Ordovician and 8.2 ± 7.2° in the Early–Middle Silurian. The respective paleolatitudinal positions for the Early–Middle Devonian comprised: the Ural margin of the Baltic paleocontinent (7.7 ± 3.7°), the Magnitogorsk island arc (3.2 ± 3.1°) and the Ural margin of the Kazakhstan paleocontinent (20.6 ± 3.8°).Conclusion. According to the analysed paleomagnetic data, in the Early–Middle Devonian, the distance between the latitudes of the margins of the Baltic and Kazakhstan continents was not less than 600 km provided they were in the same hemisphere, and more than 2,300 km provided they were in different hemispheres. The convergence of the terrains was associated with the subduction of the Ural Ocean crust before its closure, which occurred in the Tournaisian century.

scholarly journals The sources of zircons in clastic rocks of the Riphean deposits of the Urals

2019 ◽  
Vol 488 (4) ◽  
pp. 413-419
Author(s):  
A. A. Krasnobaev ◽  
V. N. Puchkov ◽  
N. D. Sergeeva ◽  
S. V. Busharina
Keyword(s):  
Southern Urals ◽  
Detrital Zircons ◽  
The Other ◽  
The Urals ◽  
The Southern Urals ◽  
Clastic Rocks ◽  
Lower Riphean ◽  
Age Variations ◽  
Age Determinations

New age determinations of detrital zircons of sandstones augmented the possibilities of interpretation of their provenance. This interpretation is often restricted by a formal comparison of age-and-composition characteristics of detrital crystals with any very distant model objects. A different situation arises when the role of a source of a detritus is claimed by local objects. The analysis of SHRIMP and TIMS - datеs of zircons and U and Th concentrations in them, and also a comparison of histograms of primary zircons from Riphean volcanics and rocks of the Taratash complex on one hand and the detrital zircons from the sandstones of Vendian (Asha series) and Lower Riphean (Ai Formation) on the other, have shown that the age variations of sources and clastics are comparable in many aspects. It means that the age characteristics of primary zircons from the Riphean volcanics and rocks of the Taratash complex as sources of zircon clastics for the Riphean and Vendian sandstones in the Southern Urals are regulated by processes of resedimentation, though the influence of distant sources is not excluded.

scholarly journals Geochemical features and formation conditions of Early-Devonian cherty-argillaceous shales and the underlying basalts in the Ishkildino section (eastern slope of the Southern Urals)

LITOSFERA ◽  
2019 ◽  
pp. 30-47
Author(s):  
A. M. Fazliakhmetov
Keyword(s):  
Volcanic Rocks ◽  
Southern Urals ◽  
Geochemical Data ◽  
Upper Ordovician ◽  
The Southern Urals ◽  
Geochemical Composition ◽  
Early Devonian ◽  
Ocean Ridges ◽  
Clay Shales ◽  
Conodont Zone

Research subject.The West Magnitogorsk zone of the Southern Urals in the vicinity of the Ishkildino village features a subaerially exposed basaltic sequence superposed by cherts and siliceous-clay shales. The basalts and the overlying shales are assumed to have formed during the Ordovician and Silurian (?)–Early Devonian (up to the conodont zone excavates inclusive) periods, respectively. The aim of this research was to reconstruct, using geochemical data, the conditions under which the rocks present in this geological location were formed.Materials and methods. Five samples of the basalts (XRD and ICP-MS methods), 27 samples of the siliceous-clay shales and 10 samples of the cherts (XRD and ICP-AES methods) were analyzed.Results.According to the ratio of SiO2, Na2O and K2O, the volcanic rocks from the lower part of the section are represented by basalts and trachybasalts. Their geochemical composition corresponds to the N-MORB and is established to be similar to that of the basalts in the Polyakovskaya formation (the Middle–Upper Ordovician). In terms of main elements, the shales under study consist of quartz and illite with a slight admixture of organic matter, goethite, quartzfeldspar fragments, etc. The degree of the sedimentary material weathering according to the CIA, CIW and ICV index values is shown to be moderate. The values of Strakhov’s and Boström’s moduli correspond to sediments without the admixture of underwater hydrothermal vent products. The values of Cr/Al, V/Al and Zr/Al correspond to those characteristic of deposits in deep-water zones remote from the coasts of passive and active continental margins, basalt islands and areas adjacent to mid-ocean ridges. For most samples, the values of Ni/Co, V/Cr, Mo/Mn are typical of deposits formed under oxidative conditions. However, several samples from the upper part of the section, which is comparable to the kitabicus and excavatus conodont zones, demonstrate the Ni/Co, V/Cr, and Mo/Mn values corresponding to deposits formed under reducing atmospheres. An assumption is made that the existence of these deposits can be associated with the Bazal Zlichov event.Conclusion.The investigated pre-Emsian shales have shown no signs of volcanic activity in the adjacent areas. The studied deposits are established to correspond to the central part of the Ural Paleoocean.

Relative movements of the Bashkirian megazone blocks(the South Urals) according to paleomagnetic data.

2021 ◽  
Author(s):  
Maiia Anosova ◽  
Anton Latyshev ◽  
Alexey Khotylev
Keyword(s):  
Thin Sheet ◽  
Southern Urals ◽  
East European Craton ◽  
Late Paleozoic ◽  
South Urals ◽  
The Southern Urals ◽  
East European ◽  
Northern Regions ◽  
Middle Paleozoic ◽  
Southern Central

<p>     The research object is magmatic bodies from the southern, central and northern parts of the Bashkirian megazone (the Southern Urals, meridian length of the Bashkirian megazone - 300 km). Most of the study intrusions have the Riphean age. In the Riphean the Bashkirian megazone was part of the East European craton. And in the Late Paleozoic rocks of the Bashkirian megazone were involved in the collision process. The formation of most studies bodies is associated with the Mashak magmatic event (the Riphean), which marks the collapse of the super-continent Nuna.</p><p>     The Middle Paleozoic component was isolated in 28 bodies. Probably it is the secondary component, that is widespread on the Southern Urals and has been repeatedly identified by other researchers. Directions comparison from different districts showed that there was a rotation of the southern, northern and central blocks of Bashkirian megazone relative to each other during the Late Paleozoic collision. At the same time, paleomagnetic directions from the northern regions (which are about 40-50 km apart from each other) statistically coincide or differ not so much. Which means that they were stable or relatively stable.</p><p>     Besides, the Riphean component was isolated and the paleomagnetic pole for the boundary of the Lower and Middle Riphean of the East European Craton (1349+/-11 Ma) is calculated from 8 thin sheet intrusions. Plat=8.4; Plong=162.4; A95=4.1.</p>

Early Devonian suprasubduction ophiolites of the southern Urals

Geotectonics ◽  
2010 ◽  
Vol 44 (4) ◽  
pp. 321-343 ◽  
Author(s):  
A. A. Belova ◽  
A. V. Ryazantsev ◽  
A. A. Razumovsky ◽  
K. E. Degtyarev
Keyword(s):  
Southern Urals ◽  
The Southern Urals ◽  
Early Devonian

scholarly journals METEORIC IRON IN PRODUCTION AND RELIGIOUS PRACTICE OF THE YAMNAYA CULTURE IN THE URALS REGION

2021 ◽  
pp. 190-206
Author(s):  
Н. Л. Моргунова ◽  
М. А. Кулькова ◽  
А. М. Кульков
Keyword(s):  
Isotope Analysis ◽  
Southern Urals ◽  
Religious Practice ◽  
The Urals ◽  
The Southern Urals ◽  
Middle Volga Region ◽  
Radiocarbon Data ◽  
Middle Volga ◽  
New Research ◽  
Functional Purpose

Среди курганов ямной культуры Среднего Поволжья и Южного Приуралья особое место занимают монументальные сооружения с находками изделий из железа. Выделяются предметы как производственного, так и ритуального назначения. По данным радиоуглеродного анализа курганы датируются в пределах первой половины III тыс. до н. э. В 2019 г. авторами на современном оборудовании проведены новые исследования химического состава поверхности металлических предметов, изотопный анализ свинца, а также реставрация железных предметов. Дополнительные исследования позволили подтвердить метеоритное происхождение железа, уточнить форму и функциональное назначение изделий. Анализ погребального обряда и инвентаря из меди и метеоритного железа позволяет сделать вывод, что курганы были предназначены для «супер-лидеров». При жизни они могли выполнять управленческие, военные и сакрально-ритуальные функции. Наличие предметов из железа свидетельствует об обожествлении власти вождей и о распространенном представлении связи лидерства и небесных сил. Large burial constructions that have yielded items made from iron occupy a special place among the Yamnaya kurgans in the Middle Volga region and the Southern Urals. It is possible to single out both production items and artifacts used for religious purposes. The radiocarbon data put the kurgans around the first half of III mill. BC. In 2019 the authors conducted new research of the chemical composition of the metal item surface, using modern equipment, performed the stable isotope analysis of the lead and carried out the restoration works of the iron objects. The additional studies provided an opportunity to confirm the meteoric origin of the iron, clarify the shape and the functional purpose of the artifacts. It can be inferred from the analysis of the funerary rite and the offerings made from copper and meteoric iron that the kurgans were intended to bury super leaders. During their lifetime such chieftains could perform management, military and sacral ritual functions. Presence of iron items suggests that the power of the chieftains was deified and the idea of the links between the leadership and heavenly forces was quite common.

scholarly journals New data on geology of the Southern Urals: a concise summary of research after the period of EUROPROBE activity

2016 ◽  
Author(s):  
Victor Puchkov
Keyword(s):  
Southern Urals ◽  
The Urals ◽  
The Southern Urals ◽  
Research Institutes ◽  
To Come

Abstract. The period of an official activity of the EUROPROBE commission was inconnected in the Urals with implementation of the URALIDES Program, that stimulated many qualified geologists from the Western research institutes and Universities to come to the region and work with local geologists at actual problems of the Uralian geology. The author tries to answer a question: what interesting results had been obtained in the Southern Urals in the last decade, when the most of foreign researchers left the Urals, and how these results correspond to the scientific conclusions that had been done before.

scholarly journals The Patriotic War of 1812 and the Foreign Campaigns of 1813-1814 in the Historical Memory of the Peoples of the Urals

2021 ◽  
Vol 20 (2) ◽  
pp. 192-204
Author(s):  
Vladimir N. Zemtsov
Keyword(s):  
Historical Memory ◽  
Southern Urals ◽  
Ural Region ◽  
School Level ◽  
Educational Institutions ◽  
Global History ◽  
The Urals ◽  
The Southern Urals ◽  
The Russian Federation ◽  
Military Production

The article identifies the features of the Ural region in terms of preserving and updating the memory of the epoch of 1812-1814. Based on the analysis of various options for preserving images of the epoch (through living memory, materialized memory, festive events and other means), the author comes to the conclusion that the Ural region, despite its remoteness from the theater of war, organically fit into the all-Russian memorial context. At the same time the memory is shaped by the regions focus on military production, and by its providing a significant part of the irregular cavalry recruited from the Orenburg Cossacks and non-Russian peoples. The latter circumstance, through images of Northern cupids, gave the Urals an exotic fame abroad. Forms of preserving Urals memory of the events of 1812-1814 range from variants of living memory, which includes elements left over from the communicative memory, to purposeful activities of central and local authorities to organize mass events at anniversary dates. A significant role in memory preservation is traditionally played by educational institutions, which, starting from the school level, form the memory of childhood. The greatest concentration of memory elements related to the epoch is observed in the Southern Urals, which is predetermined, to a large extent, by the presence of compactly living non-Russian peoples who seek to emphasize their role in the events of all-Russian and even global history. Unlike a number of other national regions of the Russian Federation, the appeal to historical memory in the Urals takes place within the framework of a unifying and reconciling tradition. Despite some commemorative gaps, the three epochs (pre-Soviet, Soviet and post-Soviet) in relation to the historical memory in the Urals about the events of 1812-1814 look quite organic. Images of this great time continue to act as a unifying factor, thus preserving the sense of a common past not only with the all-Russian, but also with common European and global history.

scholarly journals Geology, physical-chemical and geodynamic conditions for the formation of Sokolovsk and Krasnokamensk granitoid massifs (South Ural)

Georesursy ◽  
2021 ◽  
Vol 23 (1) ◽  
pp. 85-93
Author(s):  
Vladimir I. Snachev ◽  
Aleksandr V. Snachev ◽  
Boris A. Puzhakov
Keyword(s):  
Early Carboniferous ◽  
Southern Urals ◽  
Geological Structure ◽  
Rift System ◽  
Second Phase ◽  
The Southern Urals ◽  
Lower Carboniferous ◽  
Sedimentary Deposits ◽  
Granite Formation ◽  
Physical Chemical

The article describes the geological structure of the Sokolovsk and Krasnokamensk massifs located in the central part of the Western subzone of the Chelyabinsk-Adamovka zone of the Southern Urals. They are of Lower Carboniferous age and break through the volcanogenic-sedimentary deposits of the Krasnokamensk (D3kr) and Bulatovo (S1-D1bl) strata. It was found that these intrusions belong to the gabbro-syenite complex and are composed of gabbroids (phase I) and syenites, quartz monzonites, less often monzodiorites (phase II). The rocks of the second phase predominate (90–95%). Gabbros belong to the normal alkaline series of the sodium series and are close to tholeiitic mafic rocks, the formation of which is associated with riftogenic structures; syenites correspond to moderately alkaline series with K-Na type of alkalinity. It has been proved that in terms of their petrographic, petrochemical, geochemical, and metallogenic features (content of TiO2, K2O, Na2O, Rb, Sr, distribution of REE, the presence of skarn-magnetic mineralization), the rocks of the massifs under consideration undoubtedly belong to the gabbro-granite formation. Crystallization of the Sokolovsk and Krasnokamensk intrusions occurred at a temperature of 880–930 °С in the mesoabyssal zone at a depth of about 7–8 km (P = 2.2–2.4 kbar). At the postmagmatic stage, the transformation parameters of the initially igneous rocks were, respectively, T = 730–770 °C, P = 4.0–4.2 kbar. The fact that these massifs belong to the gabbro-granite formation makes it possible to include them, together with Bolshakovsk, Klyuchevsky, Kurtmaksky and Kambulatovo, into the Chelyabinsk-Adamovka segment of the South Ural Early Carboniferous rift system.

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