The Silurian of south-western margin of the East European Platform (Ukraine, Moldova and Romania): lithofacies and palaeoenvironments

Radkovets, Natalia

doi:10.7306/gq.1211

Cited by 7 publications

(8 citation statements)

References 25 publications

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“…In the deeper part there was no intensive influx of clay material. So these sediments are made up of biodetrital and dolomitized limestones, without the facial zones that existed in Silurian times [Radkovets, 2015]. Petrographic investigation of the Silurian and Lover Devonian (Lochkovian) rocks allowed selecting characteristic types of rocks from different parts of the study area (Fig.…”

Section: Lithological Characteristics Of Rocksmentioning

confidence: 99%

“…The formation of the reef facies began in Wenlock. These facies formed the boundary beyond which deep-water clay layers were deposited [Radkovets, 2015].…”

Section: Lithological Characteristics Of Rocksmentioning

confidence: 99%

“…Therefore, these deposits are of interest in terms of generation and accumulation of liquid and gaseous conventional and unconventional hydrocarbons. Paleogeographic environments in Lochkovian times of the Lower Devonian within the study area were largely inherited from the Silurian period, which led to the accumulation of clay muds with a significant content of carbonate component and contributed to the accumulation of organic matter in these sediments [Radkovets, 2015, Radkovets, 2016. Therefore, in this paper we consider the Silurian and Lower Devonian deposits as a single facies unit, which should also be considered in view of the prospects of oil and gas exploration.…”

Section: Introductionmentioning

confidence: 99%

“…The petrographic analysis of the Silurian and Lower Devonian (Lochkovian) rocks allowed us to trace the patterns of the material composition changes of these strata in time and space, and to outline their oil and gas generation prospects. [Radkovets, 2015, Radkovets, 2016.…”

Section: Introductionmentioning

confidence: 99%

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Geodynamics

Radkovets¹,

Koltun²

2022

JGD

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Purpose. The objective of this study is the investigation of the Silurian-Lower Devonian (Lochkovian) carbonate-clay sedimentary complex of the southwestern slope of the East-European platform. Its formation was the result of a single cycle of geodynamic and sedimentary events in the lithological record of the southern continental margin of Baltica. Methodology. The study is based on well-logs correlation, lithological and geochemical investigations of core samples, and petrographic thin sections analysis. The obtained results were used to establish patterns of changes in the material composition of the studied strata in time and space in order to determine the basin development dynamics of the continental margin of the Eastern European platform southwestern slope in the Silurian-Early Devonian. Results. It is established that the formation of the carbonate-clay sequence represents a single sedimentary cycle and was the result of a complex of geodynamic, depositional and paleoclimatic events that took place on the Baltica southern continental margin. The Silurian period was characterized by intensive development of benthic organisms and reef structure formation in the proximal part of the basin and clay-carbonate muds enriched with dispersed organic matter in its distal part. In the Early Devonian, carbonate biogenic sedimentation continued throughout the basin. The carbonate maximum content (80–98%) proves the existence of the reef constructions in the basin sedimentary record. Lower values of carbonate content are characteristic of marls (40–55%) and biodetritic limestones (56–75%), which make up the main part of the Silurian sequence. There are no reef constructions in the section of the Lochkovian stage of Devonian, and the calcium carbonate content in the rocks varies from 45 to 83%. The content of CaCO3 in mudstones and calcareous mudstones of the Silurian varies from 5 to 15%. Originality. The applied complex of lithological, geochemical, geological-geophysical and paleogeographic investigations allowed studying the sedimentary basin dynamics in the Silurian-Early Devonian with the assessment of the possibility of participation of these strata in oil and gas hydrocarbons generation. Practical significance. The obtained results show that the carbonate-clay complex of sedimentary rocks of the Silurian and Lower Devonian (Lochkovian) of the studied region can be considered as a separate petroleum system, including source rocks, reservoir rocks and possible conventional and unconventional oil and gas accumulations.

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Section: Lithological Characteristics Of Rocksmentioning

confidence: 99%

“…The formation of the reef facies began in Wenlock. These facies formed the boundary beyond which deep-water clay layers were deposited [Radkovets, 2015].…”

Section: Lithological Characteristics Of Rocksmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Geodynamics

Radkovets¹,

Koltun²

2022

JGD

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“…The Baltic Basin, where the Bodudd section is located, is representative of other Paleozoic tropical‐subtropical basins in terms of facies distribution (Calner et al, 2006; Lazauskienė et al, 2003; Tomczykowa, 1988). The epicratonic basin margin is formed by reefal, bioclastic, and microbial limestones, and the only clastic lithosomes are associated with forced regressive strata (Calner et al, 2006; Eriksson & Calner, 2008; Jarochowska & Kozłowski, 2014; Kozłowski & Sobień, 2012; Radkovets, 2015). The carbonate content decreases down the slope of the carbonate platform, represented by marls and calcareous mudstones, and the deepest parts of the basin are formed by graptolitic shales (Hammarlund et al, 2019; Porębski et al, 2013; Sullivan et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Reconstructing Depositional Rates and Their Effect on Paleoenvironmental Proxies: The Case of the Lau Carbon Isotope Excursion in Gotland, Sweden

Jarochowska

Nohl

Grohganz

et al. 2020

Paleoceanog and Paleoclimatol

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Variations in depositional rates affect the temporal depositional resolutions of proxies used for paleoenvironmental reconstructions; for example, condensation can make reconstructed environmental changes appear very abrupt. This is commonly addressed by transforming proxy data using age models, but this approach is limited to situations where numerical ages are available or can be reliably inferred by correlation. Here we propose a new solution, in which relative age models are constructed based on proxies for depositional rates. As a case study, we use the onset of the late Silurian Lau Carbon Isotope Excursion (LCIE) in Gotland, Sweden. The studied succession is a gradual record of shallowing upward in a tropical, neritic carbonate platform. As proxies for depositional rates we tested thorium concentration, carbonate content, and the concentration of pelagic palynomorphs. These three proxies were used to create relative age models using the previously published DAIME model. We applied these models to transform the δ13Ccarb values as well as concentrations of selected redox‐sensitive elements. The three relative age models yielded qualitatively similar results. In our case study, variations in depositional rates resulted in peaks of redox proxies appearing up to 76% higher when taken at face value, compared to when accounting for these rates. In the most extreme cases, our corrections resulted in a reversal in the stratigraphic trend of elemental concentrations. This approach can be applied and developed across depositional setting and types of paleoenvironmental proxies. It provides a flexible tool for developing quantitative models to improve our understanding of the stratigraphic record.

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