Papers by Svetlana Zorina
Geosites, Classification of
Springer eBooks, 2023
Izvestiâ Uralʹskogo gosudarstvennogo gornogo universiteta, Jun 15, 2023
Актуальность. Высокоуглеродистые уровни в морских отложениях могут маркировать резкие изменения п... more Актуальность. Высокоуглеродистые уровни в морских отложениях могут маркировать резкие изменения палеоклимата. На северо-востоке Ульяновско-Саратовского прогиба (УСП) широко распространены два высокоуглеродистых уровня-средневолжская промзинская свита (верхняя юра) и нижнеаптская ульяновская толща (нижний мел). Несмотря на многолетнее изучение механизмов их накопления, вопрос о роли палеоклимата в этих механизмах остается открытым. Целью исследования было оценить роль климатических условий как фактора накопления средневолжских и нижнеаптских высокоуглеродистых отложений на северо-востоке УСП. Методы. Для реконструкции климатических условий и оценки их влияния на накопление высокоуглеродистых отложений было проведено комплексное изотопно-геохимическое исследование кальцитовых и арагонитовых раковин нескольких групп бентосных и пелагических организмов. Предварительно методами оптической микроскопии, рентгенофазового и пиролитического анализов были изучены литолого-геохимические особенности высокоуглеродистых и вмещающих отложений. Результаты. Изотопно-геохимическое изучение раковинного материала позволило построить бентосную и пелагическую палеотемпературные кривые для поздней юры-раннего мела и реконструировать климатические условия УСП, существовавшие во время накопления промзинских и ульяновских высокоуглеродистых сланцев. На основе этих данных, а также данных литолого-геохимического изучения был уточнен механизм накопления промзинских и ульяновских сланцев. Выводы. Полученные результаты не выявили связи между изменениями климата и накоплением средневолжских высокоуглеродистых отложений. В конце средневолжского времени зафиксирован эпизод кратковременного похолодания, вероятно, связанного с вулканической активностью островных дуг северной окраины Тетиса. Нижнеаптский высокоуглеродистый горизонт формировался в гипертермальных условиях. Потепление климата контролировало накопление высокоуглеродистых осадков, увеличивая поступление в бассейн биофильных элементов и (или) создавая условия для его стратификации и стагнации. Ключевые слова: палеоклимат, изотопы кислорода и углерода, средневолжский подъярус, нижнеаптский подъярус, Ульяновско-Саратовский прогиб. Введение Мезозой, за исключением некоторых его интервалов, был временем господства на Земле парникового климата [1, 2]. На фоне этого длительного климатического оптимума выделяют несколько гипертермальных событийэпизодов быстрого повышения глобальных температур до крайне высоких значений [3]. Все они коррелируют с океанскими аноксическими событиями и маркируются в морских разрезах горизонтами высокоуглеродистых отложений (черных сланцев), образование которых обычно связывают со вспышками продуктивности планктона и с нарушенной циркуляцией в морях и океанах [4, 5]. На востоке Русской плиты, в верхнеюрском-нижнемеловом разрезе северо-востока Ульяновско-Саратовского прогиба (УСП), известно несколько высокоуглеро
Heritage, Jan 25, 2023
This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY
Doklady Earth Sciences, Aug 1, 2015
Russian Geology and Geophysics, May 1, 2009
The generalized eustatic and tectonoeustatic models developed by the author are tested on Lower C... more 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 rate of eustatic changes and the intensity and direction of epeirogenic movements. It has been revealed that the Lower Cretaceous sections in the east of the Russian Platform formed as a result of the synchronous global eustasy and regional epeirogeny. Superposition of the global eustatic curve onto the Lower Cretaceous chronostratigraphic chart of the eastern part of the platform showed that global eustasy, periodically concealed by regional epeirogeny, played a crucial role in the Early Cretaceous history of the study area. Regional epeirogenic and eustatic curves were constructed. The epeirogenic curve demonstrates the contribution of vertical tectonic movements to the overall eustatic-epeirogenic result recorded on a regional eustatic curve. The latter was constructed from the analysis of the spatial and temporal changes in the stratigraphic position of formations and strata and transgressive surfaces ranking. Eustatic cycles of different ranks, from elementary (systems tracts) to regional scale, have been recognized. In the rank of largest lithostratigraphic units, three sequences are revealed: Valanginian (RP-1K), Upper Hauterivian-Upper Aptian (RP-2K), and Albian (RP-3K), which reflect the crucial stages of the Early Cretaceous evolution of the eastern Russian Plate. The eustatic-epeirogenic processes during accumulation of formations and strata from Early Berriasian to Late Albian (145.5-99.6 Ma) are considered. It is shown that the division of the studied composite section into sequences permits precise prediction of diverse solid minerals.
Zeolite potential of Upper Cretaceous-Paleogene sedimentary rocks in the eastern and southeastern Russian Plate
Lithology and Mineral Resources, Oct 28, 2008
More than 70 samples of Turonian-Danian samples from the eastern and southeastern Russian Plate w... more 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 Santonian formation. Character of zeolite formation was examined simultaneously in both spatiotemporal and lithogenetic aspects. Analysis of the stagewise distribution of zeolites supports the concept of primary volcanogenic nature of the zeolite-forming material and actually represents an indicator of the activity of explosive volcanism in the Late Cretaceous-Paleocene. It is emphasized that high zeolite concentrations in Upper Cretaceous-Paleocene formations are a prospecting guide for zeolite raw material. They can serve as scientific basis for the formulation of prognostic-revision and prospecting works in the study region
Comment on “Relative bathymetric position of opoka and chalk in the Late Cretaceous European Basin” by M. Machalski and O. Malchyk [Cretaceous Res. 102 (2019) 30–36]
Cretaceous Research, Nov 1, 2020
Abstract In their recent paper, Machalski and Malchyk, 2019, present a paleobathymetric model pro... more Abstract 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, speaking about lithofacies, the authors do not take into account such crucial factors as mineral composition of rocks and origin of silica in the basin. “Camouflaged” pyroclastic material which is evidence of volcanic ash falls, could be among major contributors to mineral composition of opokas and among minors of chalks. Thus, considering this factor could be essential to sediment accumulation the paleobathymetric model would not face mismatches revealed in different parts of the basin. More research (including quantitative XRD and electron microscopy analysis) is necessary to study precise mineral composition and peculiarities of rock microfabrics in order to understand the proper origin of opokas and chalks, making a basis for more reliable paleobathymetric model of distribution of chalks and opokas in the Late Cretaceous European Basin.
БИОФАЦИИ БЕНТОСНЫХ ФОРАМИНИФЕР, ПАЛЕОБАТИМЕТРИЯ И СЕКВЕНС-СТРАТИГРАФИЯ СРЕДНЕЮРСКИХ-НИЖНЕМЕЛОВЫХ ОТЛОЖЕНИЙ ВОСТОКА РУССКОЙ ПЛИТЫ (РАЙОН ТАТАРСКО-ШАТРАШАНСКОЙ СКВАЖИНЫ 1, РЕСПУБЛИКА ТАТАРСТАН)
Литосфера, 2010
Carbonates and Evaporites, Sep 25, 2015
The mineral composition proportions of carbonate rocks of Kazanian (Mid-Permian) age in the Petch... more 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 of gypsum-bearing layers in the succession. Dolomicrites are prevalent in the Upper Kazanian succession, which is composed of alternation of gypsum-bearing dolomites, clayey dolomites and pure dolomites. The discovered bentonite-bearing component in marls and bentonite clays are proposed as evidence of volcanic activity in the Urals in the Kazanian stage. Two marine facies on the Eastern Russian Platform in the Kazanian: peritidal shallow flat and coastal sabkha agree well with the trends of d 18 O and d 13 C ratios.
Mixed siliceous-carbonate sedimentation in a Late Cretaceous epeiric sea: New evidence from the eastern Russian Platform
Neues Jahrbuch für Geologie und Paläontologie, Sep 1, 2018
Palaeogeography, Palaeoclimatology, Palaeoecology, 2016
On the basis of a high-resolution chronostratigraphic framework of the Eastern Russian Platform, ... more On the basis of a high-resolution chronostratigraphic framework of the Eastern Russian Platform, a comparison between Late Barremian-Aptian global and regional sea-level trends was performed. The detailed evaluation of the long-term (3rd order) Aptian sea-level cycle results in the recognition of sea-level and climate as controlling factors on depositional environments in the basin. The rising part of the Aptian sea-level cycle lasted from the Deshayesites tenuicostatusis Zone to the Deshayesites deshayesi Zone, and transgression is responsible for the local development of anoxia on the Eastern Russian Platform. The Lower Aptian bituminous shales and sheeted calcite concretions associated with the Eastern Russian Platform are interpreted as being a regional manifestation of Oceanic Anoxic Event OAE 1a. The Late Aptian "cold snap" that occurred during the Early Cretaceous greenhouse world coincided with a simultaneous global and regional sea-level lowstand, peak shallowing of the basin, and the almost complete absence of sediments due to subaerial exposure in the studied region. The global distribution of the lowstand gives clear evidence for sea-level fluctuations, and intrinsic climate control on sequences in the study area.
Resources, May 22, 2023
This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY
Stratigraphy and Geological Correlation, Jun 1, 2007
The Middle-Upper Jurassic composite section of the northeastern Ul'yanovsk-Saratov depression has... more The Middle-Upper Jurassic composite section of the northeastern Ul'yanovsk-Saratov depression has been characterized in the course of geological survey carried out seven years ago in the Sviyaga-Sura interfluve (Fig. 1). The section is represented by the beds succession typical of the Ul'yanovsk-Samara region. The beds are discriminated in accordance with unified stratigraphic charts for Jurassic deposits in the Russian plate, which were approved by the Regional Interdepartmental Stratigraphic Commission in 1993 (Explanatory Notes…, 1993) and verified in 1994. The results of litho-, bio-, magneto-and sequence-stratigraphy are published, along with characterization of the Jurassic-Cretaceous regional formations, in a series of earlier works (Balabanov, 2004; Didenko and Zorina, 2003; Zorina, 2005a, 2005b).
Surface Microtextures of Quartz Grains and Origin of the Paleogene Sands in the Ulyanovsk-Syzran Volga Region
Učënye Zapiski Kazanskogo Universiteta. Seriâ Estestvennye Nauki, 2023
Quartz grains were separated by standard sieving of the Paleogene sands from the Sosnovka Formati... more 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 separated quartz grains were examined by optical and electron microscopy. It was shown that the clastic grains of the Sosnovka sands bear the signs of a multi-stage formation process under the conditions of subaquatic (beach zone), eolian, mixed subaquatic-eolian (coastal dunes), injective, and continental pedological settings. For the first time, a complex of microtextures characteristic of the extrusion of grains from deep horizons under pressure and inherent in the injection mechanism of sand formation was described. The diagnostic complex of injectites includes rotational microtextures, notched microtroughs, and deformed fluid inclusions. The rather fresh appearance of the listed microtextures suggests that they were superimposed on the coastal-marine and eolian stages of the evolution with the subsequent formation of sand intrusions. At the final stage of the geological history of the Sosnovka sands, the grains were shaped by the continental pedological conditions, when secondary silica in the form of globules and their clusters cemented the quartz grains, the surface of which concatenated the features of the previous stages. Based on the results of the study, an interpretation scheme summarizing various microtextural features of the reconstructed paleoenvironments and the stages of formation the Sosnovka sands was developed. The finding that the Sosnovka sands are sand intrusions is of great practical importance, as it necessitates new approaches to the discovery and prediction of glass and quartz sand deposits confined to the Paleogene Sosnovka Formation of the Ulyanovsk-Syzran Volga region.
Russian Federation: Mineral Reserves
Springer eBooks, 2023
Paleogene quartz sandstones of the Sosnovka Formation of the Uljanovsk-Syzran Volga region (Eastern Russian Platform): Mineral composition and origin
Izvestiâ Saratovskogo universiteta. Novaâ seriâ, Mar 21, 2023
Russian Federation: Need of Minerals
Springer eBooks, 2016
Георесурсы, Nov 30, 2018
The fundamental facial law, determining the relationship between facies of sedimentary rocks in t... more 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. In the article considered an important aspect of diachroneity (heterochroneity) of layer associations and their litho-and biostratigraphic boundaries. The methodological approach of measuring its degree (the window of age moving) is proposed. Golovkinskiy's conceptions are developing fruitfully within the framework of Seismostratigraphy and Sequence Stratigraphy, and their main content remains in demand in the light of new realities of cognitive process (nonlinear science, NBIcS convergence, endovision).
Doklady Earth Sciences, May 1, 2018
An event-based depositional model for the Paleocene-Eocene sandy-clayey-siliceous deposits of the... more 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 lithostratigraphic units in the eastern, southeastern, and southern parts of the Russian Platform.
Mesozoic Platform Megasequences in the Eastern Part of the Russian Plate
Springer geology, 2014
ABSTRACT On the basis of investigations of the sequences and chronostratigraphy of the Middle Jur... more ABSTRACT 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 tectonic–eustatic conditions (without long breaks in sedimentation). The megasequences are characterized by peculiar sediment compositions: mineral assemblages are specific to individual horizons, units, or the entire megasequence, and they include a specific complex of solid mineral resources.
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Papers by Svetlana Zorina