Metamorphic core complexes of the Transbaikalia: review

Мазукабзов, Анатолий Муталибович; Скляров, Е В; Донская, Т. В.; Гладкочуб, Д. П.; Федоровский, В. С.

doi:10.5800/gt-2011-2-2-0036

Cited by 24 publications

(20 citation statements)

References 8 publications

(5 reference statements)

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“…Our data show that the Elikan granite gneiss arch can be ascribed to structures similar to Late Mesozoic complexes of metamorphic cores of the Cordilleran type distinguished within the Eravnino Terrane of the Yenisei-Transbaikalian tectonic collage, the Mongolia-Okhotsk fold belt, and the northern part of the Argun-Idermeg Superterrane of the Central Asian fold belt [4,8,16]. The major elements of its geological structure include a detachment zone, a core, and an upper sheet.…”

Section: Discussionmentioning

confidence: 99%

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Structural Evolution of the Elikanskiy Granite–Gneiss Swell (Western Transbaikalia)

et al. 2018

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The Elikanskiy granite-gneiss swell represents a structure, similar to Late Mesozoic Cordillerantype metamorphic core complexes allocated within the Eravninskiy terrane of the Yenisei-Transbaikal tectonic collage, the Mongolo-Okhotskiy orogenic belt and a northern part of the Argun-Idermeg superterrane of the Central Asian orogenic belt. The main elements of a geological structure of the Elikanskiy metamorphic core complex are the detachment zone, core and upper nappe. The detachment zone separating a core from the upper nappe is represented by a thick zone of blastomylonites and a zone of chlorite breccias. That zone was formed under the conditions of tangential stress and led to the exhumation and structural and metamorphic transformations of magmatic rocks of the Bukhtochinskiy Complex and metamorphic rocks of the Upper Olekma Complex, which compose the core of the considered structure. The upper nappe consists of Jurassic and Cretaceous stratified rocks of the Kyker-Akimin and Usuglinskiy basin and the Early Paleozoic-Mesozoic volcanoplutonic complexes in its southeastern framing. The Elikanskiy metamorphic core complex is a part of a huge belt of metamorphic core complexes which is traced along the northern border of the Mongolo-Okhotskiy orogenic belt on distance about 2000 km. The formation of the Elikanskiy metamorphic core complex as well as other similar complexes in the eastern part of the Central Asian orogenic belt is connected with collapse of the Late Mesozoic orogen which has resulted from the accretionary and collision events connected with closing of the Mongolo-Okhotskiy paleoocean basin and respectively formation of the Mongolo-Okhotskiy orogenic belt.

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Section: Discussionmentioning

confidence: 99%

“…Some researchers [3] considered that they originated from the interference of folds corresponding to different deformation stages. The authors believe that the granite gneiss arches and domes of the West Stanovoy Terrane are metamorphic cores of Cordilleran type [8].…”

Section: Introductionmentioning

confidence: 96%

Structural Evolution of the Elikanskiy Granite–Gneiss Swell (Western Transbaikalia)

et al. 2018

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“…The process of thickening of the earth's crust associated with mantle influence is usually accompanied by diapirism of the asthenosphere [Mazukabzov et al, 2011], basification (in the understanding of Academician V. V. Belousov) and eclogitization [Pavlenkova et al, 2016]. The thickness of the crust also increases during the formation of large igneous provinces [Artemieva and Meissner, 2012].…”

Section: Rifting and Sedex And Ssc Depositsmentioning

confidence: 99%

The Polymetallic Deposits of the Western European Plate and Structure of the Earth's Crust According to GOCE Gravity Data

Galyamov,

Volkov,

Lobanov

2024

Russian Journal of Earth Sciences

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For the first time, the results of modern studies of the earth's crust based on gravity data from the GOCE satellite Project are used for a comparative regional metallogenic analysis of the geodynamic settings of the formation of polymetallic deposits in Western Europe and the Mediterranean segment of the Tethys belt. It is shown that exhalative sulfide deposits (SEDEX) and cuprous sandstones and shales (SSC) are mainly located in the earth's crust with a predominant development of the lower “basalt” layer of the earth's crust. Pyrite copper and lead-zinc deposits in volcanogenic rocks (VMS), as well as some occurrences of the SEDEX type, are found in supra-subduction island-arc and accretionary crustal settings with a predominant development of the middle “granite” layer. Lead-zinc ores of the Mississippi type (MVT) are localized in deep pericratonic sedimentary basins with petroleum-bearing specialization on the shelf and continental slope, regardless of the stratification of the earth's crust. The results obtained can be used for regional forecasting and metallogenic constructions, prospecting and assessment of new deposits.

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“…10). Деструктивные процессы посредством развития пологих сбросов, согласно механизму простого сдвига [Sklyarov et al, 1997;Wernicke, 1985], релаксировали значительные нагрузки растяжения без разрыва континентальной коры. Поверхности ранних сбросов в северной части ОС последовательно отмирали и испытывали деформации по мере наращивания области транспрессии к югу.…”

Section: модель эволюции онежскогоunclassified

Paleoproterozoic Tectonics and Evolutionary Model of the Onega Synclinorium

Kolodyazhny,

Kuznetsov,

Poleshchuk

et al. 2023

Geodin. tektonofiz.

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Consideration is being given to the Onega Paleoproterozoic structure (Onega synclinorium, OS) as a tectonotype of intraplate negative structures, which experience intermittent subsidence over a long period of time. The paper presents a model of the OS and discusses its tectonic evolution. The model is based on the geological and structural data, already published and collected so far by the authors, as well as on the data concerning the OS deep structure, particularly on the interpretation of the 1-EV seismic profile and potential fields. The proposed model illustrates an example of conjectured interaction between different geodynamic factors and explains reasons for the development of the OS throughout the Paleoproterozoic, including the periods of intense subsidence and magmatism, inversions of local basins comprising the Onega trough, and deformations of the Paleoproterozoic strata. An important role in the formation of the OS was played by shear dislocations within an imbricate fan of its controlling Central-Karelian shear zone. The shear dislocations were accompanied by rotation of a large block located to the west of the OS, which led to the rotational-indentational interaction between adjacent blocks and to compensated coexistence among transtensional and transpressional regimes along their separating shear zone. Compensatory dynamic mechanism also manifested itself in crustal layers at the base of the OS. Horizontal flow of the mid-crustal masses and their outflow from the depression were compensated by the development of deep-seated thrust duplexes and uplifts around the depression as well as by the upper crustal extension associated with low-angle dilatant normal faulting. Successive propagation of these faults, dynamically related to shear dislocations within an imbricate fan of the Central Karelia zone, controlled the formation features and southward migration of the OS-contained basins as well as magmatic and syllogenesis-related occurrences. Multilayered subhorizontal flow of low-viscosity rocks at the base and inside the OS section against the background of shear dislocations gave rise to the occurrence of crest-like and diapir-like folding. The processes of OS formation occurred amid the development and localization of active mantle plumes and asthenospheric diapirs. One of the factors of their development and localization were the phenomena of relative decompression within the imbrication fan of the Central Karelian shear zone.

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Metamorphic core complexes of the Transbaikalia: review

Cited by 24 publications

References 8 publications

Structural Evolution of the Elikanskiy Granite–Gneiss Swell (Western Transbaikalia)

Structural Evolution of the Elikanskiy Granite–Gneiss Swell (Western Transbaikalia)

The Polymetallic Deposits of the Western European Plate and Structure of the Earth's Crust According to GOCE Gravity Data

Paleoproterozoic Tectonics and Evolutionary Model of the Onega Synclinorium

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