N. V. Badulina

Lithological–geochemical, petromagnetic, and paleoecological characteristics of the Campanian–Selandian sedimentation conditions in the Ul’yanovsk–Saratov basin

The results of a complex study of the Upper Cretaceous carbonate section in the quarry of the cement plant of the town of Sengilei (Ul’yanovsk district) are presented. The Lower Paleocene cyclic opoka member is described. The formation conditions of the Upper Cretaceous cyclic and cryptocyclic, as well as Lower Paleocene cyclic, rocks are interpreted for the first time on the basis of lithological, petrographic, petromagnetic, geochemical, and paleoecological methods. The cyclicity was formed due to dilution cycles under climate fluctuation and eustatic variations, which were caused by eccentricity cycles of the Earth’s orbit. These cycles are identified in the cryptorhythmic lanceolata sequence of the Lower Maastrichtian rocks.

The Structure and Formation Conditions of the Bedenekir Formation Deposits (Thithonian Stage) of Mountainous Crimea

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deposits of Mountainous Crimea are detailed on the basis of our work results and analysis of both published and unpublished data.

Lithogeochemical characterization of depositional environments in the Crimean-Caucasian trough during the Early Jurassic-Aalenian (Kacha Uplift and Krasnaya Polyana)

This study presents the first results of the comparison of depositional environments in the Crimean and Caucasian regions of the Crimea-Caucasus trough during the Early Jurassic and Aalenian using lithological and geochemical methods. In this study we proposed new models for variations of temperature, salinity, and bathymetry in the Early Jurassic and Aalenian.

Astronomo-climatic cycles in the sequence of Upper Cretaceous sediments of the Saratov Volga Region

The composition and genesis of the cyclic sequence of Upper Cretaceous sediments near the town of Volsk (Saratov Region) were first investigated using a series of analytical methods. The results were statistically processed using methods of manual counting, as well as spectral and wavelet analyses. Elementary formation cyclites and cyclic variations in several parameters are correlated with astronomo-climatic Milankovitch cycles.

A paleogeographic model of a Cenomanian-Turonian anoxic event in Central and East Black Sea Regions

The paper presents the sedimentological and geochemical characteristics of the Cenomanian-Turonian oceanic anoxic event (OAE-2) based on eight sections in the Central and East Black Sea Regions. A series of paleogeographic models of the OAE-2 is suggested based on Crimean and Caucasian sections.

Cyclostratigraphic Correlation of Cenomanian and Turonian Deposits of the Eastern European Platform

Depositional conditions at the Cenomanian–Turonian time have been specified and a cyclostratigraphic scheme of the correlation of the Turonian sections has been proposed based upon generalizations of our own results concerning sections of Voronezh anteclise, Ulyanovsk–Saratov trough, Crimea, and the Caucasus.

A stratigraphic scheme for the division of the Prequaternary deposits of central Crimea

A stratigraphic scheme for dividing the Triassic–Neogene deposits of the central Crimea by suites has been proposed. The division is based on the generalization of our own results and the analysis of the published and unpublished data.

The lithological-geochemical and paleoecological characteristics of sedimentation conditions in the Crimean Mountains in the Maastrichtian

The sedimentation conditions of Maastrichtian cyclic deposits in the Crimean Mountains were studied in detail for the first time using a complex of lithological and geochemical methods. The models of variations in temperature, salinity, and depth for the Tethys Ocean margin in the Maastrichtian were developed. Summary curves of δ18O and δ13C variations in Maastrichtian deposits of the Crimean Mountains were compiled.

Sedimentation conditions in the Crimea basin during the Early Campanian Age

The forming conditions of the cyclic sequence of interbedded clays, marls, and limestones in the lower Campanian Stage of the Kudrino Formation have been studied for the first time by the integrated lithological and geochemical methods. Models for the variations in temperature, salinity, and depth in the Crimean Mountains of the Tethys Ocean in the Early Campanian Age have been proposed.

Sedimentation Rates in the Epicontinental Basin in the South of the Russian Plate during the Campanian and Maastrichtian Ages

This paper is a continuation of a paper (Gabdullin et al., 2007), in which the authors described the urgency of this study, its originality, factual material (including references), and study techniques. The above-mentioned paper presented a map of the average sedimentation rates in the south of the Russian Plate during the Late Cretaceous Epoch and a series of tables with calculated sedimentation rates. In the present paper the authors present the same rate values during the Campanian and Maastrichtian ages and give a preliminary interpretation of the obtained results.