M. I. Tuchkova

• Russian Academy of Sciences

The 40Ar/39Ar isotope dating of newly formed micas and chlorites from thrust zones made it possible to establish that they were formed in the Tithonian (150 Ma). The thrusts involved sedimentary rocks of a wide age range from Devonian to Triassic. In the Silurian rocks of the Drem-Hed Mountains of Wrangel Island, an older stage of deformations of 2...

In the Mesozoic succession of the Anyui–Chukotka fold system (North‐East Russia), five stratigraphic intervals were recognised that have an abundance of gravity flow deposits. These are the Olenekian (Lower Triassic), Upper Carnian, Upper Norian, Oxfordian–Kimmeridgian and Valanginian. The Triassic gravity flow deposits formed on the south‐facing,...

—The correlation between the sedimentologic characteristics of the Upper Triassic deposits of Wrangel Island and the Chukchi Peninsula (Chukotka) is discussed. These deposits are similar in isotopic, petrographic, and geochemical features. It has been established that the Upper Triassic sand strata accumulated at different sites of a single sedimen...

The results of studies on the lithogeochemical features of the Jurassic–Cretaceous tuff- sandstones of the Ust-Belsky and Algan terranes are presented. These rock types formed under similar environment, but the areas of provenance were different, being associated with the volcanic structure of different ages. According to the results, they were for...

Tectonic and geodynamic models of the formation of the Amerasian Basin are discussed. The Arctic margins of the Chukchi region and Northern Alaska have much in common in their Late Jurassic–Early Cretaceous tectonic evolution: (1) Both have a Neoproterozoic basement and a complexly deformed sedimentary cover, with the stage of Elsmere deformations...

The results from the geological and geophysical investigations of the Siljan Ring impact structure (central Sweden) have shown that the Paleozoic sedimentary succession and the Precambrian basement were strongly affected by complex deformational processes. Studies of a new drill core from the C-C-1 well provide valuable additional information neces...

This work presents the results of mineralogical and granulometric analysis of the Late Jurassic-Early Cretaceous tuff sandstones of Algan and Ust-Belsy terranes. According to the results of granulometric and mineralogical data: tuff sandstones were formed due to the erosion of volcanic formations in moderately deep marine environment by high- and m...

Abstract—This article presents the results of the petrographic and mineralogical study of the sandstones of the Algan Formation. Sandstones are represented by ultrafine-, fine-, and medium-grained quartz–feldspar greywackes according to the сlassification of (Shutov et al., 1972). Two tectonically juxtaposed sandstone lithotypes were distinguished....

The paper analyzes Mendeleev Rise sandstones as compared with Triassic sediments of continental Chukotka and Wrangel Island. The study of sedimentological characteristics showed that in the samples, there is gradual maturation of clastic material from the south (continental Chukotka) to the north (Mendeleev Rise). Moreover, in the samples from the...

A key achievement of compilation of the Tectonic Map of the Arctic is a creation of a modern plate-tectonic model of the Circumpolar Arctic. This model demonstrates that the Arctic structure is determined by interaction of three lithosphere plates: two continental—North American and Eurasian—and one oceanic—namely Pacific. Modern seismicity serves...

Results of geological and geophysical investigations of the Siljan Ring impact structure (central Sweden) revealed complicated relationships between Paleozoic sedimentary succession and the Precambrian basement. Tectonic and depositional evolution caused complex geology. Studies of a new drill core from the C-C-1 well provide information necessary...

Glendonites represent pseudomorphs after calcium carbonate hexahydrate (ikaite) and can be used as indicators of past cold climates, because ikaite only naturally occurs in cold environments (<7°C) in the modern. The results of a multi‐proxy study of 11 glendonite and host concretion samples from Palaeogene (Gennoishi Formation) and Neogene (Bora a...

The article presents the results of studying the petrographic and mineralogical compositions of the sandstones of the Algan formation. Sandstones represented by pelitic-fine-medium-grained quartz-feldspar lithic arenites. Two tectonically combined sandstones lithotypes found. Lithotypes were formed in two heterochronous basins by high-speed and med...

Приведены результаты исследования гранулометрического и минерального составов туфопесчаников Алганского террейна. Выявлены различия в составе алганской и перекатнинской свит. Сделаны выводы о условиях осадконакопления и источников сноса обоих свит. Они формировались в сходной обстановке высоко- и среднескоростными мутьевыми потоками, в умеренно глу...

Приведены данные геохимического изучения кремней района г. Кымъылнай. Совокупность геохимических характеристик кремней указывает на их формирование в разных частях хорошо аэрируемого бассейна, в пелагической и приконтинентальной областях седиментации.

Upper Triassic sandstones from Mendeleev Rise were analyzed and compared to turbiditic sandstones of the same age from Wrangel Island and Chukotka, Arctic Sea region. Medium-grained lithic arenites dominate all of these. The quartz content is higher in the sandstones from Mendeleev Rise than in those from Wrangel Island and Chukotka. Abundant quart...

The objects of the current study are glendonite pseudomorphs forming the central part of cannonball carbonate concretions found within Miocene terrigeneous sediments of Sakhalin island (easternmost part of Russia). Twelve samples of glendonites and host carbonate concretions were examined using optical and cathodoluminescence microscopy, EDX analys...

Upper Jurassic-Lower Cretaceous deposits were formed on the South-Western margin of the Chukotka terrane in active tectonic environment. Their stratigraphic units characterized by sedimentary structures and lithology similarities, facies variation and scarcity of reliable fauna findings. Detailed lithological studies are necessary due to the absenc...

В статье обсуждаются результаты петрографических, геохимических и геохронологических исследований коллекции метаморфических пород в составе неопротерозойского фундамента о. Врангеля. На основании геохимических данных определена океаническая природа базитов, метаморфизованных в зеленосланцевой и амфиболитовой фациях в диапазоне температур 350–600° С...

The age and geodynamic position of the volcanic source of the Upper JurassicLower Cretaceous deposits of Western Chukotka were determined. Products of synchronous volcanism were revealed by detailed lithological studies. Following sedimentological analysis results we established an admixture of pyroclastic material in the Oxford-Kimmeridgian deposi...

The work presents the results of research the petrographic, mineralogical, geochemical and granulometric compositions of the tuff-sandstones of the Perekatnaya formation (albian-turonian). According to the results of granulometric, geohimical and mineralogical researches: sediments were formed due to the destruction of volcanic formations in modera...

Subject. The article presents the results of studying the petrographic, mineralogical and granulometric compositions of the tuff-sandstones of the Perekatnaya formation (Albian-Turonian). Materials and methods. The work based on the material obtained in the field research in the Ust-Belsky Mountains (Koryak Highlands), which arried out in 2011 and...

The 12th Ural lithological meeting “Sedimentary geology of the Urals and surrounding regions: today and tomorrow” and the 3rd All-Russian School of students, graduate students, young scientists and specialists on lithology “Lithology and me: from idea to conclusions” took place in Yekaterinburg, in the oldest in the region Ural State Mining Univers...

New results from the study of zircon U—Pb ages by SIMS and the geochemistry of basic volcanism of Wrangel Island’s central part are considered. Volcanites are represented by rhyolites and spilitized basalts. For a long time, the age of rocks was considered early Carboniferous, since they are discordantly overlapped by late Carboniferous limestones....

64 (2), 267-280. https://doi.org/10.21638/spbu07.2019.206 В настоящей работе приведены результаты изучения U-Pb SIMS датирования акцес-сорного циркона и геохимических особенностей основных вулканитов центральной части о. Врангеля. Обнажения последних пространственно сближены с выходами на поверхность риолитов. Долгое время образования этих пород от...

The paper presents data on mesostructural field observations in the northern, central, and eastern parts of Wrangel Island. Numerous stages in the structural evolution of geological complexes of the fold sedimentary cover of the island are confirmed. The structures of the early stage (Early Devonian) were found in Upper Silurian–Lower Devonian and...

The deposits of the Imlekin Formation of the Upper Pegtymel depression were formed in the southern margin of the Chukotka Terrane synchronously with accretion of the Kulpolney island arc to the Chukotka–Arctic Alaska microplate. The sedimentological structural features of the Upper Jurassic–Lower Cretaceous sections indicate their accumulation with...

The distribution and tectonic settings of structurally complex domains of generally folded and thrust-faulted, commonly allochthonous, rock assemblages, recognized in the very large (250,000 km 2) Koryak Upland and Chukotka regions, support the conclusion that Late Jurassic, Early Cretaceous, and Late Cretaceous shortening and, at times, accretion...

New faunal data from Carboniferous carbonates on Wrangel Island and Chukotka Peninsula (within Kuul, Alyarmaut and Polyarnyui Uplifts) are used to identify stratigraphic sequences and for regional correlations. The facies and geochemical data indicate that Carboniferous sediments on Wrangel Island, Kibera Cape and the Alyarmaut Uplift were deposite...

Combined structural, thermochronological and geochronological studies were carried out to unravel the complex late Paleozoic – Mesozoic tectonic evolution of the eastern Taimyr – Severnaya Zemlya Fold and Thrust Belt, along with the adjoining Yenisey-Khatanga Depression and Olenek Fold Zone. New detailed field mapping, a fault and fold geometry and...

Detailed structural investigations have been carried out in the Pevek district to specify tectonic evolution of the Chukotka mesozoids. The earliest south-verging folds F1 formed in Triassic rocks at the first deformation stage DI. These structures are overlapped by the northern-verging folds F2 and overthrusts pertain to the second deformation sta...

Приведены данные мезоструктурных наблюдений, выполненных авторами во время полевых работ в северной, центральной и восточной частях о. Врангеля. Подтверждена многостадийность струк- турной эволюции геологических комплексов складчатого осадочного чехла о. Врангеля. Структуры раннего этапа (D1) обнаружены в породах верхнего силура–нижнего девона и де...

New data about the composition and origin of tuff-sandstones in the Ust-Belsky Mountains

New results from the study of zircon U–Pb ages by SIMS SHRIMP and LA–ICP–MS, Nd isotopy and the geochemistry of granitic plutonism and felsic volcanism of Wrangel Island are considered. Granitic intrusions are confined to the Wrangel Complex in the Southern tectonic zone, cropping out in the core of a latitudinally extending anticlinorium and repre...

The Northern, Central, and Southern zones are distinguished by stratigraphic, lithologic, and structural features. The Northern Zone is characterized by Upper Silurian–Lower Devonian sedimentary rocks, which are not known in other zones. They have been deformed into near-meridional folds, which formed under settings of near-latitudinal shortening d...

The paper presents new data on the U–Pb zircon age, as well as results of isotopic geochemical analysis, of granites and rhyolites from Wrangel Island. The U–Pb age estimates of granites and rhyolites are grouped into two clusters (~690–730 and 590–610 Ma), which imply that these rocks crystallized in the Late Neoproterozoic. Granitic rocks dated b...

Based on geochronological U–Pb studies, the age of Wrangel Island granitoids was estimated as Neoproterozoic (Cryogenian). Some granitoids contain zircons with inherited cores with an estimated age of 1010, 1170, 1200, and >2600 Ma, assuming the presence of ancient (Neoarchean–Mesoproterozoic) rocks in the Wrangel Island foundation and their involv...

We present new data on the structure and age of terminal Permian strata in the basin of the Setorym River (tributary of the Vostochnaya Khandyga River) in the South Verkhoyansk region, represented by the Imtachan Formation and the lower part of the Nekuchan Formation. Based on the new findings of bivalves fossils from the Intomodesma costatum Zone,...

The South Anyui suture zone consists of late Paleozoic-Jurassic ultramafic rocks and Jurassic-Cretaceous pre-, syn-, and postcollisional sedimentary rocks. It represents the closure of a Mesozoic ocean basin that separated two microcontinents in northeastern Russia, the Kolyma-Omolon block and the Chukotka block. In order to understand the geologic...

Present-day structure of Wrangel Island was formed during two main stages of Mesozoic-Cenozoic deformation. The general fold-thrust structural grain of the island, characterized by northern vergence and complicated by NW-trending right-lateral strike-slip faults, originated in the post-Triassic. Mesostructural data indicate a near-meridional orient...

The South Anyui Suture separates the structures of the Chukotka and Verkhoyansk-Kolyma Fold Areas. The suture consists of ophiolites, island-arc rocks, deformed Upper Triassic and Upper Jurassic-Lower Cretaceous turbidites, and accretionary-type terrigenous melange with blocks of oceanic crust. Two main stages in the geological history of the South...

The distribution and tectonic settings of structurally complex domains of generally folded and thrust-faulted, commonly allochthonous, rock assemblages, recognized in the very large (250,000 km2) Koryak Upland and Chukotka regions, support the conclusion that Late Jurassic, Early Cretaceous, and Late Cretaceous shortening and, at times, accretion r...

Continental margin of Northeastern Asia includes many island arc terranes that differ in age and tectonic position. Two convergent margins are reconstructed for Late Jurassic - Early Cretaceous time: Uda-Murgal and Alazeya - Oloy island arc systems. A long tectonic zone composed of Upper Jurassic to Lower Cretaceous volcanic and sedimentary rocks i...

Triassic clastic deposits of Chukotka are represented by rhythmic intercalation of sandstones, siltstones and mudstones. During the Triassic, sedimentation was represented by continental slope progradation. Detrital zircons from Triassic sedimentary rocks were collected for constrain its paleogeographic links to source terranes. Zircons populations...

The South Chukchi Basin separates the late Mesozoic Chukotka Fold Belt from the Wrangel Arch and represents the northwestern continuation of the Hope Basin of the United States sector of the Chukchi Sea, which is filled with middle Eocene-Quaternary nonmarine, marine, and lacustrine rocks. The main stages of South Chukchi Basin development in the C...

The Russian Chukchee Sea is one of the most remote regions of Eastern Arctic with very high hydrocarbon potential. It is widely believed that the North Chukchi Basin of the Russian Chukchi Sea has similar geological structure and evolution with the famous US North Slope of Alaska petroleum province. Here we discuss the principal tectonic events, pr...

Studied region is situated in western Chukotka, in Northeast Russia. We examine the part of Chukotka microplate, the key element in the evolution of the Amerasian basin. The Triassic of Chukotka is represented by up to 5 km of deposits. Triassic terrigeneous deposits consist of three different complexes: Lower-Middle Triassic, Upper Triassic Carnia...

The numerous current hypotheses on structural evolution of the present day Arctic require validation using data from regional geological studies. We are focusing on terrigenous deposits of Triassic age, which are the key to correlate geological events from the Eastern Arctic and the Verkhoyansk-Kolyma and Anyui-Chukotka fold systems. Triassic depos...

Postsedimentation alteration and structural assemblies of the Triassic sedimentary complexes of West Chukotka are discussed. Zoning of the alteration is based on examination of newly formed structural and mineral assemblages, the chemical composition, and the polytypes of clay minerals. Three zones of postsedimentation transformation of sandstones...

New chemical data on terrigenous rocks from the Russian Far East paleobasins different in age and geodynamic style were compared with similar data on the recent and old sediments accumulated in well-known geodynamic settings. The generalization and geodynamic interpretation of the original results revealed the island-arc nature of the studied objec...

The study area is part of the Anyui subterrane of the Chukotka microplate, a key element in the evolution of the Amerasia Basin, located in Western Chukotka, Northeast Russia. The subterrane contains variably deformed, folded and cleaved rhythmic Triassic terrigenous deposits which represent the youngest stage of widespread marine deposition which...

A long tectonic zone composed of Upper Jurassic to Lower Cretaceous volcanic and sedimentary rocks is recognized along the Asian continent margin from the Mongol-Okhotsk fold and thrust belt on the south to the Chukotka Peninsula on the north. This belt represents the Uda-Murgal arc, which was developed along the convergent margin between Northeast...

The northern Siberia occupies a wide area with several sedimentary basins with high hydrocarbon potential. To the north from it there is the Laptev Sea rift basin which is believed to be one of the most promising offshore areas for hydrocarbon discoveries

Jurassic-Lower Cretaceous sedimentary sequence, exposed on the Chukotka continental margin is critical for understanding the timing, dynamics and sedimentary setting evolution of Chukotka-Eurasia collisional process (e.g., Sokolov et al., 2002) and so, represents one of the key regional stratigraphic units (Til'man,1973, Tibilov,1982; Miller et al....

Upper Jurassic-Lower Cretaceous sincollisional sedimentary sequence, exposed on the Central part of Northern Chukotka is critical for understanding the timing, dynamics and sedimentary setting evolution of Chukotka-Eurasia collisional process (e.g., Sokolov et al., 2002) and so, represents one of the key regional stratigraphic units (Til'man, 1973;...

During the summer of 2006 TGS-NOPEC conjointly with Geophysical Solutions Integrator acquired new seismic data in the Russian part of the Chukchi Sea. The area of the Chukchi Sea studied includes (from S to N): South Chukchi sedimentary basin (1), Wrangel Late Kimmerian Arch (2), North Chukchi sedimentary basin (3). Due to the absence of offshore w...

The age and mode of formation of the various sub-basins of the Amerasian Basin of the Arctic Ocean remain unknown. Jurassic-Cretaceous synorogenic foreland basin deposits are the youngest stratigraphic units deposited in the Russian Arctic prior to rifting and formation of the Amerasian Basin. U-Pb dating of detrital zircon suites (6 samples, ∼100...

This paper documents the achievements of Russian sedimentologists and mineralogists who have used heavy minerals to reconstruct the provenance and source lithologies of Mesozoic-Caenozoic sedimentary complexes of the Far East and the western Pacific Ocean, and identify their plate tectonic settings. We provide a review of publications, written most...

The Lower-Middle Triassic section of the Enmynveem River dated on the basis of macrofauna includes three genetic types of sediments with different structural-textural features: (1) sediments of high-density autokinetic flows; (2) sediments of low-density turbidity flows; and (3) background sediments with thin interlayers of fine-grained turbidites....

This paper presents the results of structural, lithologic, and geochronological (K-Ar, Rb-Sr) studies of the Carnian terrigenous rocks in the sedimentary cover of the Chukchi microcontinent and U-Pb dating of detrital zircons. From the lithological features, three types of sections are recognized. Terrigenous sequences of the first type were deposi...

1] To test existing models for the formation of the Amerasian Basin, detrital zircon suites from 12 samples of Triassic sandstone from the circum-Arctic region were dated by laser ablation-inductively coupled plasma-mass spectrometry (ICP-MS). The northern Verkhoyansk (NE Russia) has Permo-Carboniferous (265–320 Ma) and Cambro-Silurian (410–505 Ma)...

Late Jurassic to Early Cretaceous Myrgovaam Basin sediments (previously Rauchua Trough) are regionally significant because of the stratigraphic constraints they provide on the age and progression of deformation in the Chukotka fold belt, a possible along-strike continuation of the Alaskan Brooks Range fold-and-thrust belt. Existing descriptions of...

Investigation of the Triassic–Lower Cretaceous rocks of the Dal'negorsk key section (southern Sikhote Alin) revealed the following successive associations of authigenic clay minerals: (1) sericite–chlorite (Lower Triassic); (2) mica–chlorite (Anisian–Norian); (3) chlorite–mica (Rhaetian–Lower Jurassic); and (4) smectite–chlorite–mica (Upper Jurassi...

Chukotka's Triassic terrigeneous deposits form three different complexes: Lower-Middle Triassic complex, Upper Triassic Karnian complex and Upper Triassic Norian complex. The studied part of western Chukotka is composed of variably deformed, folded and cleaved rhythmic deposits. All the complexes are represented by rhythmic intercalation of sandsto...

Cretaceous sedimentary and volcanosedimentary rocks from northwestern Kamchatka are considered. The stadial analysis has revealed variable impacts of three major provenances upon the Cretaceous Penzhina sedimentary basin. The provenances were composed of volcanic and volcanosedimentary rocks (Uda–Murgal island arc and Okhotsk–Chukotka volcanic belt...

POST-SEDIMENTATION TRANSFORMATIONS OF LOWER-MIDDLE JURASSIC SANDSTONES OF GREAT CAUCASES M.I. Tuchkova Geological Institute Russian Academy of Sciences, Moscow, Russia tuchkova@geo.tv-sign.ru/ /Fax: (095) 2310443 Generalization of author’s and literature data is based on the analysis of sandstones cement and structure, composition and politypism of...

The South Anyui fold zone (western Chukotka) is considered a suture zone related to closure of the South Anyui oceanic basin and collision of Eurasia with the Chukotka–Arctic Alaska microcontinent in the Early Cretaceous. The existence of a compensatory sedimentation basin (foredeep) during folding in the terminal Jurassic–initial Cretaceous remain...

The Upper Jurassic Lower Cretaceous complexes of Uda-Murgal island arc were formed along the convergent boundary between the Northeastern Asia and northwestern Pacific plates. The northern part of the complex exposes volcanic, pyroclastic, and sedimentary deposits from the axial zone of the palaeo-volcanic arc; the central part consists of terrigen...