History of the formation of the early Carboniferous gabbro-granite formation, Southern and Middle Urals

2019 ◽  
pp. 10-18
Author(s):  
A. V. Snachev ◽  
V. I. Snachev ◽  
M. A. Romanovskaya
Keyword(s):  
Early Carboniferous ◽  
Southern Urals ◽  
Island Arc ◽  
Middle Urals ◽  
The South ◽  
The Southern Urals ◽  
Granite Formation ◽  
History Of

The article presents new data on the geology and petrogeochemistry of the Magnitogorsk, Nepljuevsk and Kanzafarov rock complexes. Their belonging to the gabbro-granite formation has been proved. These data give opportunity to combine the South Ural and Middle Ural segments of the Early Carboniferous subduction rift into a single submeridional structure. Its formation took place at the Devonian island arc rear basin. The arc was overthrusted on the western edge of the East Ural Rise during the collision stage of the Southern Urals development. The Cu-Mo specialization of granitoids of the Magnitogorsk and Nepljuevsk complexes has been established.

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 Arched Objects (Noseband) as Part of a Horse Harness of the Early Nomads of the Southern Urals

2020 ◽  
pp. 102-115
Author(s):  
Sergey Sirotin
Keyword(s):  
Southern Urals ◽  
Direct Influence ◽  
Chronological Order ◽  
The South ◽  
The Southern Urals ◽  
History Of ◽  
Nomadic Communities ◽  
Military Activity

The presented article analyzes a series of objects, which are parts of the horse harness of the early nomads in the Southern Urals of the 4th century BC. These are arched objects (nosebands) designed to increase the efficiency of horse control. The article provides a brief overview of the history of these items being discovered in the steppe complexes. In particular, attention is focused on the archaeological context of these objects as part of horse harness. The article contains all currently known finds of these objects found in the Southern Urals. Separately, the article discusses the issues of the burials chronology, where these horse harness accessories are found. The appearance of such an element in horse harness was caused by over all increasing level of military activity in nomadic communities. An analysis of the burials where arcuate objects (nosebands) were found shows that the period of their appearance and distribution in the Southern Urals dates to the second half of the 4th century BC. Attention is drawn to the fact that most of these objects are found in rich, status burials or as part of rich sacrificial complexes. The article considers all currently known finds of these items. Analogies from the territory of Scythia are given and the chronological order of these objects in the complexes of the Southern Urals is considered. The article concludes that these objects (as well as a number of others that have direct analogies in the bridle sets of Scythia) became parts of the South Ural nomads’ horse harness under the direct influence of Scythian territories.

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.

The History of the Early Carboniferous Gabbro–Granite Formation (Southern and Middle Urals)

2019 ◽  
Vol 74 (6) ◽  
pp. 540-548
Author(s):  
A. V. Snachev ◽  
V. I. Snachev ◽  
M. A. Romanovskaya
Keyword(s):  
Early Carboniferous ◽  
Middle Urals ◽  
Granite Formation ◽  
History Of

Volcanism of the transitional stage from the Late Devonian island arc to Early Carboniferous rifts in the Southern Urals

2008 ◽  
Vol 63 (6) ◽  
pp. 359-367 ◽  
Author(s):  
N. V. Pravikova ◽  
E. A. Matveeva ◽  
Al. V. Tevelev ◽  
A. B. Veimarn ◽  
A. V. Rudakova
Keyword(s):  
Early Carboniferous ◽  
Southern Urals ◽  
Island Arc ◽  
Late Devonian ◽  
Transitional Stage ◽  
The Southern Urals

The forest margin vegetation of the South Urals (Bashkortostan Republic)

2009 ◽  
pp. 54-96 ◽  
Author(s):  
S. M. Yamalov ◽  
S. V. Kucherova
Keyword(s):  
Southern Urals ◽  
South Urals ◽  
The South ◽  
The Southern Urals ◽  
New Associations ◽  
Class Distribution ◽  
Forest Margin ◽  
Eastern Border

The syntaxonomy of the Southern Urals’ forest margins in Bashkortostan Republic is presented. Three new associations and four communities are described. The criteria of identifying the forest margins communities to belong to the class Trifolio-Geranietea and the eastern border of the class distribution are discussed.

scholarly journals Broad-leaved plants of the Southern Urals broad-leaved-conifer forests (some results of the studies)

2018 ◽  
Vol 7 (2) ◽  
pp. 16-20
Author(s):  
Yuriy Petrovich Gorichev ◽  
Ildar Ravilevich Yusupov ◽  
Alexander Nikolaevich Davydychev ◽  
Aleksey Yurievich Kulagin
Keyword(s):  
High Altitude ◽  
Plant Communities ◽  
Southern Urals ◽  
Conifer Forests ◽  
The South ◽  
The Southern Urals ◽  
Standard Methods ◽  
Forest Sites ◽  
Natural Reserve ◽  
Different Types

The paper deals with the study of broad-leaved plants of the Southern Urals broad-leaved-conifer forests. Stationary studies were conducted on the territory of the South Ural state natural reserve, where 9 forest sites in different types of broad-leaved forests were laid. The research used standard methods while microclimatic observations used digital thermometers-recorders Thermochron. The authors have obtained some data on the structure and composition of the characteristic types of broad-leaved forests with oak and maple domination. The authors have classified ecosystems and plant communities, selected 3 types of biogeocenoses and 4 types of phytocoenoses. Studies have established that selected types of broad-leaved forests are associated to certain elements of relief and high-altitude levels. The obtained materials provide the basis for further monitoring of forests.

scholarly journals Silver ore exploration in the Southern Urals

2020 ◽  
pp. 110-119
Author(s):  
Evgenii A. Kurlaev ◽  
Keyword(s):  
Field Survey ◽  
Southern Urals ◽  
17Th Century ◽  
Geological Survey ◽  
The Southern Urals ◽  
Mining Areas ◽  
Sequence Of Events ◽  
History Of ◽  
The Town ◽  
Ore Exploration

Introduction. Native historiography associates the beginning of Southern Ural industrialization with the construction of first metallurgical works in the 1740s. Historians paid attention to geological exploration in the Urals in the 17th century but they had no idea about the survey areas. Historical archeological study on the edge of the town of Zlatoust in the Southern Urals has managed to find the trace of the largest geological survey expedition aimed at silver ore exploration as far back as 1669–1673. Expedition at that time represented a major military autonomous formation (regiment) under a voivode’s (Slavic title for a war-leader) command. A large number of participants was due to the need for great manpower and protection from hostile nomads Research aim is to introduce unique discoveries in the history of mining into professional scientific use. Methodology. When analyzing the historical material, the methods of field survey and investigation on the documents of ancient mining remains have been developed. Results. The sequence of events has been retraced in the article, geological survey and mining areas and stages have been determined. Organizational structure, quantity, aims and results of the largest geological survey expedition in the history of Russia have been defined. Mining traces have been discovered being a unique monument to the history of mining in the 17th century.

scholarly journals New representatives of the species Kerpia samarica from the location Novyi Kuvak (kazanian stage, Samara Region)

2016 ◽  
Vol 5 (2) ◽  
pp. 11-15
Author(s):  
Liubov Mikhailovna Bukhman ◽  
Nikolay Sergeevich Bukhman
Keyword(s):  
New Species ◽  
Southern Urals ◽  
Species Level ◽  
Middle Urals ◽  
The Southern Urals ◽  
Kazanian Stage ◽  
New Findings ◽  
The One ◽  
Kungurian Stage ◽  
A New Species

The article is devoted to the study of new representatives of the genus Kerpia Naugolnykh from Novyi Kuvak located in Shentalinsky district (northeast of Samara region). The genus Kerpia for ginkgo similar leaves was set by S.V. Naugolnykh in 1995 on the material from the Kungurian stage of the Middle Urals. Typical species of this genus is Kerpia macroloba Naugolnykh. In the diagnosis of the genus S.V. Naugolnykh showed the most important signs of this genus: presence of lobes and sinuses of the 1st and 2nd order, distinct petiole and two veins included in lamina from the petiole. Later, in 2001, from the sediments of Kazanian stage of the Southern Urals S.V. Naugolnykh described a new species Kerpia belebeica Naugolnykh. In 2013 in Novyi Kuvak location we found impressions of ginkgo similar leaves with on the one hand a great similarity with the known members of the genus Kerpia ( Kerpia macroloba and Kerpia belebeica ), but on the other hand they are clearly not identical to this representative at the species level. According to the results of the study of these impressoins in 2014 we described a new species of the genus Kerpia - Kerpia samarica N.S. Bukhman et L.M. Bukhman, 2014. In this paper we give description of both known and new findings of species Kerpia samarica and a comparison of this species with other species of the genus Kerpia .

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