Ekaterina Shcherbinina

Russian Academy of Sciences | RAS · Laboratory of Micropaleontology

THE PLANKTONIC FORAMINIFERAL PECULIARITIES OF THE MIDDLE AND UPPER EOCENE OF ARMENIA AND NORTH-EASTERN PERITETHYS AND PROBLEMS OF INTERREGIONAL CORRELATION.

The first results of the U–Th–Pb isotope dating of detrital zircons (dZr, N = 130, n = 91) from the middle Danian sandstones (63.9–65.3 Ma) of the Cretaceous–Eocene Novorossiisk–Anapa flysch widely developed in the Sochi synclinorium (southern slope of the Western Caucasus) are presented. The maximum and minimum dZr age is 2973 ± 12 Ma and 318 ± 3...

The first results of U–Th–Pb isotope dating of detrital zircons (dZr, N = 130, n = 91) from the Middle Danian sandstones (63.9–65.3 Ma) of the Cretaceous–Eocene Novorossiysk–Anapa flysch, widely developed in the Sochi synclinorium (Southern slope of the Western Caucasus) are presented. The maximum dZr age is 2973 ± 12 Ma, the minimum dZr age is 318...

Abstract The early Aptian Oceanic Anoxic Event 1a (OAE1a, or Selli Event) is widely known from many oceanic and inland sections as an interval of enhanced accumulation of sediments rich in total organic carbon (TOC), associated with the turnover in the global carbon budget and dramatic biotic variations. Our multidisciplinary study of the upper Ba...

The comparative characteristics of sedimentary successions corresponding to the paleoecological event OAE 2, which are spaced over 1000 km apart within the Crimean–Caucasian region, are present. It is shown that the sediments accumulated during this time span under different sedimentary conditions are featured by the similar structures. The sedimen...

A continuous outcrop of the neritic sediments ranging from the Cretaceous/Paleogene to Eocene/Oligocene boundary is exposed along the Kheu R., Kabardino-Balkaria Republic, southern Russia. High calcareous nannofossil abundance and species diversity in Kheu section make possible the application of various standard calcareous nannofossil zonations fo...

A relatively complete section of the Maikop Group (Oligocene – lower Miocene) is exposed along the Sulak River valley in Dagestan (NE Caucasus) and contains a depositional record for this part of the Eastern Paratethys. At the Sulak River outcrop, the Maikop Group is ca. 1200 m thick and can be divided into six lithologically-defined formations: th...

Samples of the Maikop Group are characterized by variations in TOC content ranging between 0.14 and 11.06 wt. %. The highest values were measured in both carbonate-and clay-rich samples from the Khadum Formation, and the lowest (less than 0.5 wt.%) in sandstones from the overlying Oligocene Miatly, Lower Clayey and Mutsidacal Formations. Samples of...

The Urtsadzor section, typical for the Paleocene-Eocene of Southern Armenia, is composed of hemipelagic to shelf succession.Planktonic foraminifera (PF), larger benthic foraminifera (LBF), and nannofossils were studied from Priabonian sediments of rtsadzor section that enabled direct correlation of the biohorizons of these three groups. We resent h...

The Urtsadzor section, typical for the Paleocene-Eocene of Southern Armenia, is composed of hemipelagic to shelf succession. Planktonic foraminifera (PF), larger benthic foraminifera (LBF), and nannofossils were studied from Priabonian sediments of Urtsadzor section that enabled direct correlation of the biohorizons of these three groups. We presen...

The Urtsadzor section, typical for the Paleocene-Eocene of Southern Armenia, is composed of hemipelagic to shelf succession. Planktonic foraminifera (PF), larger benthic foraminifera (LBF), and nannofossils were studied from Priabonian sediments of Urtsadzor section that enabled direct correlation of the biohorizons of these three groups. We presen...

The Urtsadzor section, typical for the Paleocene-Eocene of Southern Armenia, is composed of hemipelagic to shelf succession. Planktonic foraminifera (PF), larger benthic foraminifera (LBF), and nannofossils were studied from Priabonian sediments of Urtsadzor section that enabled direct correlation of the biohorizons of these three groups. We presen...

Биостратиграфическое распространение планктонных фораминифер (ПФ), их состав и ареалы видов определяются климатической зональностью, влиянием палеогеографических связей и фациальными условиями. Авторы представляют сведения о нахождении родов Morozovelloides, Clavigerinella, Hantkenina ПФ (рис. 1) с отчетливыми диагностическими признаками и менее яс...

The lower Eocene sediments from the classical Paleogene section exposed along the Kheu River, northern Caucasus, southern Russia are here studied. This ca. 50m thick succession is lithologically contrasting: the lower and upper parts are composed by soft marls separated by a thick Radiolaria-rich unit of non-calcareous and low-calcareous mudstones...

Представлены результаты палинологического изучения средне-верхнеэоценовых отложений опор-ного разреза Актумсук (плато Устюрт, Узбекистан), сопоставленные с данными изучения извест-кового наннопланктона. Изучение распространения диноцист в разрезе выявило 5 диноцисто-вых зон шкалы Пери-Тетиса: Costacysta bucina, Enneadocysta pectiniformis, Rhombodin...

Manifestations of short-term global and subglobal events have been rercognized in the Mesozoic and Cenozoic sedimentary record of the North Caucasus: Paleocene/Eocene boundary PETM, late Ceno-manian (OAE2), late Albian (OAE1c and OAE1d), terminal Aptian-early Albian (OAE1b), early Aptian (OAE1a), late Hauterivian (Faraoni), late Valanginian (Weisse...

The Cretaceous/Paleogene (K/T) boundary interval was studied in the Okhli and Gubden sections, northeastern Caucasus. Two sediment successions represented in these sections were accumulated in different zones of the paleobasin and distinguished by their lithological and geochemical characteristics. The high-resolution study of nannofossils revealed...

The results of integrated study of the Cretaceous/Paleogene transition in the northeastern Caucasus are reported. The lithological, geochemical and micropaleontological characteristics of the sediments from two sections (Okhli and Gubden, Mountainous Dagestan) accumulated in different parts of paleobasin are displayed. An analysis of nannofossil di...

Manifestations of short-term global and subglobal events have been recognized in the Mesozoic and Cenozoic sedimentary record of the North Caucasus: Paleocene/Eocene boundary PETM, late enomanian (OAE2), late Albian (OAE1c and OAE1d), terminal Aptian–early Albian (OAE1b), early Aptian (OAE1a), late Hauterivian (Faraoni), late Valanginian (Weissert)...

The results of integrated study of the Cretaceous/Paleogene transition in the northeastern Cauca-sus are reported. The lithological, geochemical and micropaleontological characteristics of the sediments from two sections (Okhli and Gubden, Mountainous Dagestan) accumulated in different parts of paleobasin are displayed. An analysis of nannofossil d...

The results of palynological study of the mid-upper Eocene sediments of the Aktumsuk key-section (Ustyurt Plateau, Uzbekistan), calibrated with nannoplankton data, are presented. Dinocyst stratigraph-ical distribution permitted to recognize five Dinoflagellate Zones from the Peri-Tethys zonation: Costacysta bucina, Enneadocysta pectiniformis, Rhomb...

The Cenozoic sediments exposed in the valley of Sulak R., Dagestan, eastern Caucasus provide the most complete information about the specificity of evolution of paleobasins of NE Paratethys. The first detailed study and lithological division of sediments incorporated into Maikop Group was made by N.S. Shatsky in 1926 and remains relevant to the pre...

Previous studies made in different parts of the world have shown that Barremian-Aptian times imply many difficulties in deciphering the biostratigraphy, microfossil evolution and correlation of bioevents. In an attempt to improve our knowledge of this period in a particular area of the Tethyan realm, we present the first integrated study of microbi...

The integrated study of the Paleogene microbiota (calcareous nannofossils, planktonic foraminifers, large and small benthic foraminifers) of the middle Eocene – lowermost Oligocene of the Landzhar and Urtsalandzh sections are important for definition of the bases of Priabonian and Rupelian stages in the Southern Armenia and characterization of thes...

The composition and origin of the Bedenekir Formation deposits of Mountainous Crimea are detailed on the basis of our work results and analysis of both published and unpublished data.

Composition and origin of deposits belonging to Bedenekyr Formation of the Mountainous Crimea based upon generalizations of our own results and analysis of published and unpublished data were specified.

Zonal subdivision of the Aptian (Lower Cretaceous) of Partizanskoe and Krasnaya gorka sections from the upper reaches of Alma River, South-Western Crimea, was made on the basis of the study of planktonic foraminifera, nannofossils and ostracodes. Correlation of zones and comparing of the sections was made. In the Partizanskoe Section, foraminiferal...

Upper Eocene and Lower Oligocene rocks in the northeastern Caucasus were examined in the most representative Chirkei section (Sulak River basin). Sharp lithogeochemical distinctions between them were revealed. The results of the study of nannoplankton demonstrated that the Eocene/Oligocene interface occurs slightly below the boundary between the Be...

The results of the study of nannofossils and palynomorphs from the Landzhar section in southern Armenia were used to correlate bioevents of two groups of microorganisms, recognize zonal subdivisions, and identify variations in the assemblage compositions reflecting changes in the hydrology and sedimentation regime in the basin during the middle Eoc...

The transition from the Bartonian to the Priabonian, as traditionally understood, has long been associated with a series of extinctions and originations in several microfossil groups. The planktonic forami-nifer genus Morozovelloides and large species of Acarinina suffered a rapid global extinction, as did many radiolarians. Calcareous nannofossils...

The transition from the Bartonian to the Priabonian, as traditionally understood, has long been associated with a series of extinctions and originations in several microfossil groups. The planktonic forami- nifer genus Morozovelloides and large species of Acarinina suffered a rapid global extinction, as did many radiolarians. Calcareous nannofossil...

The reference mid-Cretaceous Aimaki section, central Dagestan

The sedimentary record of the Paleocene–Eocene Thermal Maximum (PETM) in the wide epeiric sea of the NE Peri-Tethys contains a sapropelitic bed (SBD) characterized by a specific microfossil assemblage and negative oxygen and carbon isotope excursions (CIE). New results obtained from a high-resolution sampling of this interval in the Kheu section, c...

The bryozoan of the collection from the Campanian–Maastrichtian of the Pitnyak group of uplifts in Turkmenistan and the central Kyzyl Kum Desert in Uzbekistan is revised. The bryozoan species, recently identified as Onychocella spinata Favorskaja, 1980 (order Cheilostomata), are shown to belong to two species: O. spinata and O. exilis sp. nov. The...

The paper represents results of micropaleontological study of the Eocene sediments from the borehole No. 57 (Eastern Pre-Caspian region). Succession of dinocyst, calcareous nannoplankton and diatom events enabled to update the stratigraphic age of the upper Sholaksay Formation (late-latest Ypresian), lower Buldurta Formation (latest Ypresian?—Lutet...

The first complex lithological–stratigraphic and facies study of the Aptian–Cenomanian sediments of the Abkhazian Zone of the Western Caucasus has been conducted in sections of the Mzymta and Khipsta river valleys. As a result, we are able to define areas of distribution of potential oil-source rocks in these sediments, which correspond to the even...

Records of the palaeoenvironmental changes that occurred during the Paleocene Eocene Thermal Maximum (PETM) are preserved in sedimentary rocks along the margins of the former Tethys Ocean and Peri-Tethys. This paper presents new geochemical data that constrain paleoproductivity, sediment delivery, and seawater redox conditions, from three sites tha...

Изучение наннопланктона, диноцист и фораминифер из палеогеновых отложений Урминского плато Центрального Дагестана позволило впервые установить точный возраст сероцветной свиты, соответствующий позднепалеоценовому–среднеэоценовому интервалу, провести зональное рас� членение по всем трем группам микропланктона и непосредственно сопоставить зональные...

The study of nannofossils, dinocysts, and foraminifera from Paleogene deposits of the Urma Plateau of Central Dagestan revealed the Paleocene-Eocene age of the Gray Formation, to apply zonations based on of all three groups of microplankton, and to correlate the regional dinocyst and planktonic foraminifer zonations to the standard nannofossil scal...

The Cretaceous sections of the eastern Caucasus contain rich in organic matter (OM) sediments corresponding to the late Cenomanian Oceanic Anoxic Event 2. They are marked by positive δ13C and negative δ18O isotopic anomalies, which are characteristic for this level in many areas of the world. The sediments exhibit distinct cyclic patterns reflected...

For the first time was established that the data about the lithological composition of the Aptian Albian and Cenomanian sediments in the Abkhazian zone, which were based mainly on the description of natural outcrops, differ from those that were obtained during the study of the sections of boreholes that were drilled in sediments of the same age. In...

The intense construction of the objects of the Sochi 2014 Olympics in the valley of the Mzymta River is proceeded within very complex geological structure of the region and the development of modern exogenous processes (modern or ancient landslides). The main difficulties in the division and correlation of geological sections is the similar litholo...