Svetlana O. Zorina

Kazan Federal University · Department of Paleontology and Stratigraphy

The results of application of geoinformation modeling technology to create a three-dimensional model of Paleogene sand injectites are presented. The mineralogenic significance of sand injectites as sources of glass and construction raw materials is described. The modeling process using the obtained data set and three-dimensional modeling environmen...

The Paleogene Sosnov Formation is represented by glass quartz sands which are widely occurred in the eastern part of the Russian Platform. Interest in Paleogene quartz sands in Russia is increasing due to the growing needs of the glass industry. But by now, the mineral resource base of glass raw materials in the European part of Russia is of almost...

A comprehensive mineralogical study of 13 samples of spheroidal gold from schlich concentrates of the Middle Kyvvozh gold placer, which is part of the Kyvvozh gold placer field located in the central part of the Volsk-Vym ridge of the Middle Timan, was carried out. The presence of both natural and technogenic gold in concentrates was established. N...

Relevance of the work. Black shale horizons may reflect abrupt paleoclimate changes. In the northeast of the Ulyanovsk-Saratov Trough (UST), two black shale horizons widely occur, the Middle Volgian Promzino Formation and the Lower Aptian Ulyanovsk Formation. Despite years of research, the role of paleoclimate in their accumulation is still under d...

Quartz grains were separated by standard sieving of the Paleogene sands from the Sosnovka Formation of the Ulyanovsk-Syzran Volga region, which are a scarce and valuable raw material for glass making and construction. In order to establish the origin of the sands and restore the facies conditions of their formation, the surface microtextures of the...

Geological information present on web-pages determines the efficacy of the online marketing of geosites. In this paper, a new approach aimed at an easy and quick assessment of geosite-focused web-pages is proposed. It is based on scoring by several criteria reflecting the quality and the quantity of geological information. Attention is paid to the...

The Paleogene quartz sandstones of the Sosnovka formation are widely occurred in the Uljanovsk-Syzran Volga region and are used as valuable building materials. The articlecomprises an improvement for thecontinental origin of the Sosnovkasandstones based on the results of a comprehensive study of the features of the mineral composition and microstru...

We present a novel study of fluid inclusions in the vein quartz of the Kyvvozh gold placer field and in the quartz of gold-quartz intergrowths from the placer (methods of homogenization, cryometry, and Raman spectroscopy were used). We determined that in vein quartz the homogenization temperature of fluid inclusions fluctuated in the range of 220–4...

Characterizing geological heritage sites (geosites) available in Russia remains an urgent task. The present study focuses on two geosites from the vicinity of Kazan—a large city on the Volga River. They are attributed to the standardized geoheritage types and scored by means of several criteria. It is found out that the Pechischi geosite represents...

Palynological information is important in the studies of the Upper Jurassic and Lower Cretaceous deposits of the Western Caucasus, but it is still incomplete. New investigations undertaken in the Apsheronsk District of the Krasnodar Region has permitted to reveal better the composition of the peculiar deposits attributed to the Fuabginskaya Formati...

Fluid inclusions in quartz and lazulite (Mg,Fe2+)Al2(OH,PO4)2 were studied for the first time in the quartz‒lazulite‒hematite-tourmaline veins of Mt. Chernaya, the Nether-Polar Urals. It was found that they are very similar. Homogenization of the most inclusions occurs at 155‒220°C in lazulite and at 147‒235°C in quartz; and salinity varies between...

The most disastrous consequence of the Early Aptian Oceanic Anoxic Event (ОАЕ) in the epeiric sea of the Eastern Russian Platform for benthic foraminifers (BF) was oxygen decrease and the onset of sulphidic conditions associated with toxic enrichment in heavy metals. The latter can be regarded as one of the main causes for BF distress and even thei...

Urban geoheritage is an important research theme, and new lines of evidence are necessary for its development. The small town of Kamennomostskiy located in southwestern Russia is crossed by lengthy outcrops of Tithonian variegated sedimentary rocks along the Belaya River and its right tributary. These rocks include red (iron rich) siltstones, dolom...

The current research aims to reconstruct sources of the rocks and pyroclastic input in the epeiric sea of the Eastern Russian Platform in the Latest Jurassic. Nine samples of the Volgian mudrocks, black shales, and sandstones from the Tatar Shatrashany borehole section and Gorodischi outcrop were investigated using the mineralogical, ICP-MS, XRD, e...

. Widespread “camouflaged” pyroclastics including smectite, illite-smectite and heulandite are detected in the upper jurassic– lower cretaceous deposits of the Ulyanovsk-Saratov basin. Moreover, volcanic glasses are found in several stratigraphic units. The quantity of pyroclastic material in the study section (17–72%) is probably related to volcan...

Human intervention in the geological environment is commonly thought to pose a threat to geoheritage. However, new information from the Western Caucasus where unique geological features are concentrated in Mountainous Adygeya, implies that man-made features in fact add value to geoheritage. Such features include a lengthy artificial niche in the Gu...

Based on the results of studying the lithological-geochemical features of the Upper Jurassic-Lower Cretaceous mudrocks and black shales in the Eastern Russian Platform, the continuous distribution of pyroclastic material in the whole section is established. Possible sources of acid pyroclastics were active volcanoes of the Transcaucasian ensialic i...

Toxic environments are reconstructed during the OAE 1a in the epeiric sea of the Northeastern Peri-Tethys. Very high toxicity of sediments in conjunction with lack of oxygen could therefore result in conditions not suitable for benthic fauna dwelling. Black shales should be considered as one of the most important sources of the light carbon isotope...

The Early Cretaceous quantitative sea-level curve constructed for the epeiric basin of the Eastern Russian Platform (Northeastern Peri-Tethys) is based on the results of facial analysis and quantitative paleo-depth assessment. The detailed evaluation of the Early Cretaceous sea-level cycles results in recognition of the sea-level and climate change...

In their recent paper, Machalski and Malchyk (2019) present a paleobathymetric model proposed relations among main facies types, including opoka and chalk, along a perpendicular to the shore. The model is seemed to be a pioneering one based on paleoecological and taphonomical data from the successions from Poland and western Ukraine. However, speak...

Caves are commonly used for the purposes of geological conservation and tourism, but such experience is very limited in desert areas of northeastern Africa. The Sannur Cave discovered near Beni Suef in Egypt a few decades ago has been investigated in order to judge about its importance as geological heritage. It is established that the study territ...

The environments, favorable for the development of benthic microfauna were predominant in the Jurassic Sea in the northeastern part of the Ulyanovsk-Saratov Trough (Russian Platform). Such parameters as the distribution and the taxonomic composition of the assemblage of Jurassic benthic foraminifers, their abundance, generic and species diversity,...

Toxic environments are reconstructed during the OAE 1a in the epeiric basin in the north-eastern Peri-Tethys. Black shales deposited during the OAE 1a reveal very high level of contamination as cumulative toxic effect of ten toxic metals exceeds four times the nontoxic level. Conjunction of toxic background with absence of oxygen could therefore re...

Dispersed geoheritage points, which are small-sized and low-unique localities, manifest local geoheritage and, thus, may be useful for its comprehensive understanding. Field studies in the Lagonaki Highland (Western Caucasus, southwestern Russia) have permitted to find four geoheritage points that are described with argumentation of their importanc...

The fundamental facial law, determining the relationship between facies of sedimentary rocks in the sedimentary basin in lateral and vertical extensions, was formulated by the Russian geologist N.A. Golovkinsky a century and a half ago. Theoretical statements and views proposed by Golovkinsky have not lost their importance and relevance nowadays. I...

The knowledge of mixed siliceous–carbonate sedimentary rocks requires significant extension. Lithological and geochemichal peculiarities of the Late Turonian–Middle Campanian deposits have been examined in the Mezino-Lapshinovka section of the Uljanovsk-Saratov Trough (eastern Russian Platform). Three main lithologies are gaizes (a kind of mixed si...

The knowledge of mixed siliceous–carbonate sedimentary rocks requires significant extension. Lithological and geochemichal peculiarities of the Late Turonian–Middle Campanian deposits have been examined in the Mezino-Lapshinovka section of the Uljanovsk-Saratov Trough (eastern Russian Platform). Three main lithologies are gaizes (a kind of mixed si...

An event-based depositional model for the Paleocene—Eocene sandy–clayey–siliceous deposits of the Russian Platform was proposed. The model was based on pulsational input of pyroclastic material and intrusion of sandy injectites. These processes should be taken into account to identify the stratigraphic position of the Paleocene–Eocene lithostratigr...

New scenario for explaining the formation of the upper Cretaceous gaizes in the NE Peri-Tethys is suggested. There are strong geochemical and microfabric evidences for episodic manifestations of anoxic non-sulfidic (ferruginous) conditions in the late Coniacian and early Campanian in the NE Peri-Tethys. The late Coniacian ferruginous episode may pr...

The mineral composition proportions of carbonate rocks of Kazanian (Mid-Permian) age in the Petchischi region (eastern part of the Russian Platform) was identified by X-ray powder diffraction, ICP-MS and optical microscopy. The Lower Kazanian deposits are presented predominantly by bio-dolomicrites with changing terrigenous component and the lack o...

The idea of the Anthropocene attracts attention of scientists, policy-makers, and broad public to the geological activity of humans and poses new important questions for the modern stratigraphy. The growth of the Anthropocene-related knowledge and its promotion can be based potentially on the UNESCO World Heritage Sites (WHS). On the one hand, many...

A detailed study of the mineral composition and microstructure of the black shales associated with OAE1a (Eastern Russian Platform), OAE1b (Middle Caspian), and the host rocks has been carried out using X-ray diffraction, scanning electron microscopic, and microprobe analyses. The results provide important constraints for depositional environments...

Depositional environments during OAE1a (Early Aptian) in the Eastern Russian Platform and during OAE1b (Early Albian) in the Middle Caspian: new data

The paper proposes a new event model of formation of Paleocene-Eocene sands and sandstones of the Southern and South- Eastern Russian Platform and their overlying Eocene bentonite clays. Sands have been considered as sand injectites, which outpouring and intrusion are due to tectonic activity of the Pachelma and Dnieper-Donets aulacogens and the Vo...

This review provides a synopsis of ongoing research and our understanding of the fundamentals of sea-level change today and in the geologic record, especially as illustrated by conditions and processes during the Cretaceous greenhouse climate episode. We give an overview of the state of the art of our understanding on eustatic (global) versus relat...

The quantitative sea-level curve in the eastern part of the East European Platform during the Early Cretaceous first compiled for this region is based on the results of analysis of the corresponding deposits and the bathymetric distribution of benthic foraminifers in their sections. This quantitative curve is correlated with the sea-level curve con...

The idea of the Anthropocene attracts attention of scientists, policy-makers, and broad public to the geological activity of humans and poses new important questions for the modern stratigraphy. The growth of the Anthropocene-related knowledge and its promotion can be based potentially on the UNESCO World Heritage Sites (WHS). On the one hand, many...

This study presents new data on transgressive–regressive and accommodation–sedimentation regimes in the eastern Russian Plate during the Middle Jurassic–Lower Cretaceous. The proposed generalized scheme illustrating the combined effects of three major factors (eustasy, tectonic "noise", and depositional gradient) controlling the deposition of seque...

On the basis of investigations of the sequences and chronostratigraphy of the Middle Jurassic–Lower Cretaceous deposits in the eastern part of the Russian Plate, five megasequences are identified: the upper Bajocian–Callovian, Oxfordian–Berriasian, Valanginian, upper Hauterivian–Aptian, and Albian megasequences. These were formed under stable tecto...

A methodical approach to assessment of the role played by vertical tectonic movements in the of tectonic–eustatic cyclicity and the facial appearance of the Middle Jurassic–Lower Cretaceous deposits on the eastern part of the East European Craton has been suggested. Resulting from comparison between the glo� bal and regional eustatic curves, the mo...

The component composition and specific features of the structure of smectite�bearing clays in the Middle Eocene Kievskaya Formation of the Russian Plate were studied by the scanning electron microscopic, X�ray phase analysis, and complete chemical analysis methods. The clays are characterized by metastable (unsta� ble) state of material expressed a...

Chronostratigraphically-justified records of regional transgressions and regressions are important for understanding the nature of the Paleocene shoreline shifts on a global scale. Review of previously synthesized data from 7 tectonically “stable” regions, namely the eastern Russian Platform, Northwestern Europe, Northwestern Africa, Northeastern A...

The generalized eustatic and tectonoeustatic models developed by the author are tested on Lower Cretaceous deposits of the eastern part of the Russian Plate. The models are applicable to facies analysis of sections of epicontinental basins with mainly slope sedimentation. They demonstrate possible variations in section lithology depending on the ra...

The eastern periphery of the Russian Platform houses an exceptional record of the Jurassic/Cretaceous transition, which is represented by very thin sandstone beds. The presence of glaucony grains, phosphorite concretions and shark teeth indicates that the transitional sediments constitute a condensed succession, although the allochtonous origin of...

More than 70 samples of Turonian-Danian samples from the eastern and southeastern Russian Plate were studied by the X-ray phase analysis and classical wet chemistry. It has been established that zeolites occur in all studied types of carbonate, siliceous, and clayey rocks. Steadily high zeolite concentrations were revealed in sections of the Santon...