scholarly journals The magnitude of the transverse contraction of the Middle Tien Shan along the “Karabuk” profile at the late orogenic stage

2021 ◽  
Vol 929 (1) ◽  
pp. 012006
Author(s):  
E S Przhiyalgovskii
Keyword(s):  
Sedimentary Basin ◽  
Sedimentary Cover ◽  
Late Phase ◽  
Tien Shan ◽  
Eurasian Plate ◽  
Horizontal Deformation ◽  
Basic Principles ◽  
Tectonic Reconstruction ◽  
New Material ◽  
Rock Complex

Abstract The detailed geological profile “Karabuk” constructed in recent years, crossing the triad of alpine structures “Naryn Depression - Baibichetoo Uplift - Atbashi Depression [[CHECK_DOUBLEQUOT_ENT]] in the central part of Tien Shan, provides new material for studying the style and parameters of deformations at the late phase of the Indian - Eurasian plate collision. Using original methodological techniques and in accordance with the basic principles of balanced sections method, the horizontal deformation of the rock complex of the Cenozoic sedimentary cover (a meridional reduction in the width of the orogenic belt) was determined, starting from the end of the Neogene. Variations in the thickness of the cover layers determined during the research were taken into account. The presented tectonic reconstruction demonstrates the structure of a single Naryn-Atbashi sedimentary basin before the intense deformations at the late orogenic phase. It is significant, that the magnitude of deformations on individual segments of the profile differs markedly. The cover of the Atbashi depression is more deformed, its width has decreased by 6 km (about 17%) in this section, while the borders of the wider Naryn depression have converged by only 3.7 km (8%). The total South-North contraction of the NBA system measured by us during the Cenozoic is about 10 km (12% of its original width). The values of the contraction from south to north (the horizontal component of the deformation) obtained by us compared with the values given by other researchers.

Geothermal features of the western part of Yenisei-Khatanga regional trough

2019 ◽  
pp. 28-36
Author(s):  
Dmitry A. Novikov
Keyword(s):  
Oil And Gas ◽  
Sedimentary Basin ◽  
Sedimentary Cover ◽  
Heating Effect ◽  
Small Thickness ◽  
Geological Evolution ◽  
Geological Section ◽  
Gas Bearing ◽  
Different Parts ◽  
Comprehensive Study

The article deals with the results of a comprehensive study of the geothermal conditions of oil and gas bearing deposits in the western part of Yenisei-Khatanga regional trough. Four types of vertical geothermal zonality are established, the characteristics of which depend on the geological evolution of different parts of the sedimentary basin. The minimal geothermal gradients (1,80–2,2 0 C/100 m) are established there in the near edge zones with a small thickness of the sedimentary cover and the development of the infiltration system. The maximum gradients (3,2–3,4 0 С/100 m) are established in the zones of disjunctive tectonics, which had a significant heating effect on the geological section due to the ascending discharge of groundwater from deep-lying aquifers.

scholarly journals Geodynamics and geothermics of Pre-Caspian Depression and eastern segment of Caucasus region

2020 ◽  
pp. 52-69
Author(s):  
В.Б. Свалова
Keyword(s):  
Sedimentary Basin ◽  
Sedimentary Cover ◽  
Sedimentary Basins ◽  
Caucasus Region ◽  
Himalayan Belt ◽  
Eastern Segment ◽  
Caspian Depression ◽  
Formation And Evolution ◽  
Gas Potential ◽  
Oil Gas

Актуальность работы определяется важностью оценки и прогноза нефтегазового потенциала глубоких осадочных бассейнов, в частности, глубоких горизонтов структур, не всегда доступных глубокому бурению в поисковых и разведочных целях. Цель и методы исследования. Наряду с прикладными вопроса- ми целью исследования являются фундаментальные вопросы теоретической геодинамики формирования и эволюции осадочных бассейнов в связи с подъемом мантийных диапиров на основе методов механи- ко-математического моделирования. Прикаспийская впадина и восточный сегмент Кавказского региона, включая Каспийское море, могут рассматриваться как регионы окрестности восточной части Альпийского пояса, который в свою очередь является западной частью Альпийско-Гималайского пояса, простирающе- гося от западной оконечности Средиземного моря до Тихоокеанского побережья. Каспийское море пере- секает с севера на юг серию широтных структурных зон юго-восточной окраины древней докембрийской Восточно-Европейской платформы, молодой эпигерцинской Скифско-Туранской платформы и современ- ного Альпийско-Гималайского орогенного пояса. Прикаспийская и Южно-Каспийская впадины являются глубокими осадочными бассейнами с толщиной осадочного чехла более 20 км, обладающими высоким нефтегазовым потенциалом и большим народно-хозяйственным значением. Формирование и эволюция осадочного бассейна служат ключом для определения зон нефтегенерации осадочного чехла, что делает задачу изучения геодинамики осадочных бассейнов крайне важной и необходимой. Геодинамика релье- фа поверхности определяется глубинными мантийными движениями. Механико-математическая модель динамики литосферы дает возможность количественно связать параметры формирующегося осадочного бассейна с подъемом мантийного диапира. Анализ геофизических полей геологических структур позволя- ет оценить подъем астеносферы, а разработанная самосопряженная термогравиметрическая модель ли- тосферы делает эти оценки надежными и достоверными. Геодинамика и история развития геологических структур определяют магматизм, вулканизм, сейсмичность, геотермические характеристики, геотермаль- ную активность, нефтегазоносность, опасные природные процессы региона, что в свою очередь является обоснованием создания системы комплексного экологического мониторинга на фундаментальной научной базе, прогноза и предупреждения природных бедствий и катастроф, а также поиска полезных ископаемых, включая углеводороды. Результатом работы является количественная оценка подъема астеносферы под осадочным бассейном на примере Прикаспийской впадины The relevance of the work is determined by the importance of assessing and predicting the oil and gas potential of deep sedimentary basins, in particular, deep horizons of structures that are not always accessible to deep drilling for prospecting and exploration purposes. The aim and research methods. Along with applied questions, the aim of the study is the fundamental questions of the theoretical geodynamics of the formation and evolution of sedimentary basins in connection with the rise of mantle diapirs based on the methods of mechanical and mathematical modeling. Pre-Caspian Depression and eastern segment of Caucasus region, including Caspian Sea, can be considered as regions of area of eastern part of Alpine belt, which is western part of Alpine-Himalayan belt disposed from Mediterranean sea to Pacific Ocean. Caspian sea crosses from North to South the series of structural zones of East European platform, Scythian-Turan platform and Alpine-Himalayan belt. Pre-Caspian Depression and South Caspian Depression are deep sedimentary basins with thickness of sedimentary cover more than 20 km which have high oil-gas potential and big industrial importance. Formation and evolution of sedimentary basin is the clue for oil-gas generation zones of sedimentary cover, that makes the problem of sedimentary basins geodynamics of great importance one. Geodynamics of relief is defined by deep mantle movements. Mechanical-mathematical model of the lithosphere dynamics gives possibility to link the basin parameters with mantle diaper upwelling. Analysis of geophysical fields gives opportunity to evaluate the asthenosphere upwelling, and elaborated self-conjugated thermo-gravimetric model makes this evaluation reliable and trustworthy one. Geodynamics and evolution history of geological structures determine magmatism, volcanism, seismicity, geothermics, geothermal manifestations, oil-gas potential, natural hazards of region, that is basement for monitoring system creation and construction on fundamental scientific base, forecast and prognosis of natural catastrophes and oil-gas potential researches. The result of this work is a quantitative assessment of the rise of the asthenosphere under the sedimentary basin using the example of the Pre-Caspian Depression

scholarly journals Distribution of Cenozoic metalliferous coal deposits in Zeya-Bureya Sedimentary Basin (Eastern Siberia): Tectonic reconstruction and paleogeographic analysis

2019 ◽  
pp. 33-45 ◽  
Author(s):  
A. P. Sorokin ◽  
A. A. Konyushok ◽  
V. M. Kuzminykh ◽  
T. V. Artyomenko ◽  
A. A. Popov
Keyword(s):  
Noble Metals ◽  
Middle Miocene ◽  
Sedimentary Basin ◽  
Bureya Basin ◽  
Coal Deposits ◽  
Tectonic Reconstruction ◽  
Basin Formation ◽  
High Level ◽  
Bureya Sedimentary Basin ◽  
Geodynamic Activity

Distribution of noble metals, rare metals and rare earth elements in the Paleocene and Lower-Middle Miocene coals of Zeya-Bureya sedimentary basin was analyzed. Reconstruction of the basin formation in the Mesozoic and Cenozoic was performed with detailed paleogeographic analysis of the Cenozoic coal-bearing sequences from the position of geodynamic features of the adjacent regions development. Geological events at the turn of the Cretaceous and Paleogene are considered. Comprehensive analysis of the metal content in the basin frame carried out. We described conditions of migration and localization of trace elements. Given conditions arose mainly in the process of geodynamics developed on the northwestern flank of the Zeya-Bureya basin including the static orogens in the Paleocene — Miocene where the sedimentation was actively expanding. Microelements migration with capturing denudation plains occurred in stable processes of peat accumulation and localization of economically important components in streams associated with plains. Contrasting forms of conjugation in the flexure-uplift system and uneven localization of microelements are determined by high level of geodynamic activity on the south-eastern margin of Zeya-Bureya sedimentary basin. The presence of gold throughout the strata of the Paleocene and Lower-Middle Miocen coal-bearing sediments in the Sergeevskoe, Yerkovetskoe and Raychikhinskoe deposits is established. The Sergeevskoe deposit coals are enriched with Be, Sc, V, Ga, Rb, Nb, Ta, REE + Y.

Triassic magmatism along the Eurasian margin of the Palaeotethys: U-Pb zircon age constraints from the western part of the Sakar-Strandzha Zone, Bulgaria

2020 ◽  
Author(s):  
Nikolay Bonev ◽  
Petyo Filipov ◽  
Raya Raycheva ◽  
Robert Moritz
Keyword(s):  
Eastern Mediterranean ◽  
Sedimentary Cover ◽  
Regional Scale ◽  
River Valley ◽  
Late Carboniferous ◽  
Early Triassic ◽  
Eurasian Plate ◽  
Zircon Age ◽  
Clastic Rocks ◽  
Granite Body

<p>In the Aegean sector of the Alpine orogen of the Eastern Mediterranean, the Sakar-Strandzha Zone (SSZ) represents a major tectonic unit that straddles the territories of Bulgaria and Turkey. The westernmost part of the SSZ in Bulgaria includes the area along the Maritsa river valley and the St. Iliya Heights, both connected through several small outcrop areas under the Cenozoic sedimentary cover. In Bulgaria, the Triassic felsic magmatism along the Maritsa river valley was inferred by Chatalov (1961) on the basis of the stratigraphy, but only a single U-Pb zircon age revealed Early Triassic (ca. 249 Ma) felsic magmatism in the SSZ of Turkey (Aysal et al., 2018). Here, we constrain the timing of Triassic magmatism using U-Pb LA-ICP-MS zircon geochronology of felsic magmatic bodies in the western part of the SSZ in Bulgaria.</p><p>A sample from a (meta) rhyolite body yielded a concordant age of 237.8 ± 3.4 Ma, which confirmed a crystallization likely concomitant with the deposition of the Triassic clastic rocks in the northern Maritsa river valley. To the east along the valley, a leucocratic granite body located south of the Permian Sakar batholith (ca. 295-296 Ma, Bonev et al., 2019), yielded a concordant age of 242.1 ± 1.8 Ma for the crystallization, having crosscutting relationships with the high-grade metamorphic basement. A leucocratic and K-feldspar porphyric meta-granite bodies yielded concordant ages of 243.3 ± 5.8 Ma and 240.6 ± 2.3 Ma, respectively, for the crystallization within the so-called Harmanli block to the south along the valley. At St. Iliya Heights a sample from the Prochorovo Formation (meta) rhyolite body yielded a concordant age of 245.4 ± 1.5 Ma for the crystallization, which implies an Early Triassic age of the clastic rocks with which it inter-fingers. In the area between the Maritsa river valley and the St. Iliya Heights at the village of Svetlina a leucocratic meta-granite body yielded a concordant age of 229.6 ± 2.4 Ma. The concordantly dated zircons that yielded Triassic ages of the igneous/meta-igneous protoliths all have Th/U ratios compatible with the magmatic process. The major elements of the dated samples reveal calc-alkaline to high-K-alkaline peraluminous felsic compositions similar to the adjacent Late Carboniferous-Permian igneous/meta-igneous rocks of the SSZ.</p><p>The U-Pb zircon ages reveal Early-Middle Triassic magmatic phase (ca. 245-230 Ma) in the western SSZ of Bulgaria. These age data provide a regional-scale temporal link for the Triassic magmatism extending to the easternmost extremity of the SSZ in Turkey. The Triassic continental type felsic magmatism in the western SSZ is interpreted to result from the ongoing Paleotethyan subduction under the Eurasian plate, which magmatism follows the development of a Late Carboniferous-Permian continental magmatic arc of the SSZ (Bonev et al., 2019).</p><p>References</p><p>Aysal, N., Şahin, S.Y., Güngör, Y., Peytcheva, I., Öngen, S., 2018. Journ. Asian Earth Sci., 164, 83-103.</p><p>Bonev, N., Filipov, P., Raicheva, R., Moritz, R., 2019. Int. Geol. Rev., 61, 1957-1979.</p><p>Chatalov, G., 1961. Compt. Rend. Acad. Bulg. Sci., 14, 503-506.</p><p>Acknowledgements: The study was supported by the NSF Bulgaria DN04/6 contract.</p>

The syn-rift sedimentary cover of the North Biscay Margin (bay of Biscay): from new reflection seismic data

2002 ◽  
Vol 173 (6) ◽  
pp. 515-522 ◽  
Author(s):  
Isabelle Thinon ◽  
Jean-Pierre Réhault ◽  
Luis Fidalgo-González
Keyword(s):  
Seismic Data ◽  
Sedimentary Basin ◽  
Sedimentary Cover ◽  
Seismic Facies ◽  
Bay Of Biscay ◽  
Seismic Reflection Data ◽  
Reflection Seismic ◽  
The North ◽  
Reflection Data ◽  
Lower Aptian

Abstract The Armorican Basin is a deep sedimentary basin lying at the footside of the North Bay of Biscay. From previous scattered inadequate data, the age and nature of this basin, oceanic domain or deep part of the Armorican margin itself were largely speculated. From this new seismo-stratigraphic study based on a dense seismic cover, the sedimentation within the Armorican Basin is beginning in the Aptian times, during the last tectonic rifting episode of the margin. The first sediments formation identified as the « 3B layer » is characterised on the profiles by a chaotic and transparent seismic facies and was emplaced by slumping process when the margin collapsed, at the final rifting phase, just before the oceanic accretion. The new seismic reflection data give also some informations on the polyphased evolution of the North Biscay Margin during the rifting period. Two main events occurred during the Lower Cretaceous times (the first one is pre-Berriasian, the second is Aptian), separated by a quiet tectonic period including the Upper Berriasian and Lower Aptian times. The first event is responsible of the margin tectonic structuration in some blocks, the second of collapsing and the emplacement of the allochthonous sediments (3B layer) in the Armorican Basin.

Barite nodules of possibly late diagenetic origin from Twitya River area, Mackenzie Mountains, Northwest Territories

1976 ◽  
Vol 13 (10) ◽  
pp. 1446-1455 ◽  
Author(s):  
Peter Laznicka
Keyword(s):  
Northwest Territories ◽  
Sedimentary Basin ◽  
Late Phase ◽  
Tectonic Deformation ◽  
Carbonate Concretions ◽  
Laramide Orogeny ◽  
Quartz Monzonite ◽  
Carbonaceous Shales ◽  
Mackenzie Mountains ◽  
Host Rocks

Conspicuous spherical and subspherical barite nodules occur in Devonian(?)/Mississippian carbonaceous shales and argillaceous dolomitic limestones in Twitya river area (western foothills of the Backbone Ranges, Mackenzie Mountains, N.W.T.).The majority of barite nodules are spherulitic, composed of grey radiating barite crystals. The microscopic study of barite and of sedimentary fabrics in its host rocks has demonstrated that the crystallization of nodules was a late diagenetic event postdating the formation of carbonate concretions in shales, dolomitization, and the early phase of fracturing, but predating the late phase of fracturing and tectonic deformation. The nodules have clearly developed by replacement of their carbonate host.The middle to late Paleozoic, black shale sequence that occurs on both sides of the Yukon – Northwest Territories boundary at the latitude of Macmillan Pass (Canol road) appears to be in a distinct barite province with numerous occurrences of mostly bedded barite recorded. The presently available evidence indicates that the introduction of barium into the sedimentary basin had probably been syndepositional, followed by diagenetic concentration and barite emplacement well before the 'Laramide Orogeny' and the emplacement of Cretaceous quartz monzonite stocks.

scholarly journals SEISMOSTRATIGRAPHIC MODEL OF THE ALADAN-MAYA SEDIMENTARY BASIN, SOUTHEASTERN SIBERIAN PLATFORM

2020 ◽  
Vol 39 (6) ◽  
pp. 25-47
Author(s):  
E.P. Razvozzhaeva ◽  
Keyword(s):  
Siberian Platform ◽  
Oil And Gas ◽  
Sedimentary Basin ◽  
Sedimentary Cover ◽  
Parent Material ◽  
Geologic Map ◽  
Seismic Sections ◽  
Basin Boundaries

Generations of the materials of the seismic exploratory works conducted in the Aldan-Maya sedimentary basin substantiated the seismostratigraphic model and construction of the lateral and longitudinal sections allowed an understanding of the specific features of the sedimentary cover structure and specifying the basin boundaries. Based on the seismic sections and geologic map at a scale of 1: 2 500 000 a scheme of structures formed in the Riphean was developed. These constructions made it possible the purposeful plan of the oil-and-gas searching and exploratory works, estimation of thickness and area of the parent material. The investigations made can be applied for clarification of the structure of the eastern Siberian Platform.

scholarly journals Structural and geological studies in the Naryn and Atbashi depressions (Tien Shan) and geological interpretation of magnetotelluric data

2021 ◽  
Vol 929 (1) ◽  
pp. 012007
Author(s):  
E S Przhiyalgovskii ◽  
A K Rybin ◽  
Yu A Morozov ◽  
E V Lavrushina ◽  
M G Leonov ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Sedimentary Cover ◽  
Structural Features ◽  
Geological Structure ◽  
Tien Shan ◽  
Upper Crust ◽  
Seismic Profiles ◽  
Magnetotelluric Data ◽  
Geological Interpretation ◽  
Basement Structures

Abstract The article presents the results of complex geological and geophysical studies in the Naryn depression and Atbashi depression in the Middle Tien Shan. They included the geological interpretation of new magnetotelluric data along the detailed profile crossing the key segment of the Tien Shan, and the study of the morphology and spatial position of the sedimentary cover and basement structures. The compilation of the results of structural-geological and geophysical studies makes it possible to create a 2D model of the upper-crust geological structure, consistent with the structure of the electrical conductivity to depths of about 10 km and to analyze the structural features of deeper horizons. Two types of structural patterns of the electric conductivity, corresponding to the sedimentary complexes of the cover and the folded-metamorphic complexes of the basement, have been identified. Sedimentary rock complexes in depressions have a high electrical conductivity and subhorizontal structure. The upper crust above the K2 density layer is characterized by an alternation of rocks volumes with contrasting conductivity, elongated vertically. The recorded structure of the field confirms the presence of steep zones of fluid permeability and fragmentation, noted earlier in seismic profiles and probably corresponding to the Paleozoic structures of fragmentation of the Earth’s crust, activated during Alpine orogeny. Comprehensive research allow to characterize the deformations of the Cenozoic sedimentary complex and the surface of the Paleozoic basement associated with the Alpine activation of the key segment of the Tien Shan.

scholarly journals CONDITIONS FOR THE FORMATION OF CLINOFORMS IN THE MIDDLE AND SOUTH CASPIAN MEGABASIN

2021 ◽  
Vol 2 (446) ◽  
pp. 82-89
Author(s):  
P. Z. Mammadov ◽  
R. Y. Ganiyevа
Keyword(s):  
Oil And Gas ◽  
Sedimentary Basin ◽  
Sedimentary Cover ◽  
Mobile Belt ◽  
South Caspian Basin ◽  
Stratigraphic Analysis ◽  
Central Segment ◽  
Specific Shape ◽  
New Perspective

The paper considers sedimentation process and objects of lateral development in deep-water uncompensated and shallow-water – epicontinental paleobasins developed at various evolution stages of South- Caspian and Middle-Caspian basins. The South Caspian megabasin is a great tectonic crustal element and a highly prospective sedimentary basin in the central segment of the Alpine-Himalayan mobile belt. The role of boundary structures of Scythian-Turan platform in the Middle Caspian (such as South-Caspian land and Karaboghaz arc) and avalanche sedimentation on the continental shelf in development of sedimentation units and specific shape objects of lateral development in many kilometers long sedimentary cover of South-Caspian basin has been shown. According to interpretation of seismo-stratigraphic data the inflow of paleodeltaic, avandelatic and turbidite objects of lateral development for infill of the Early Pliocene basin has been proved. Seismo-stratigraphic analysis, using other analyses (e.g. study of morphostructure of palaeorelief and thicknesses of the units and formations) and GSW, enabled the genesis of deposits in the underlying PS formations to be clarified from a new perspective and the favou- rable zones of formation of large lithological and stratigraphic traps for oil and gas accumulations to be identified.

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