Search articles

Kinds of «Fluid – Massive Material» Interference in Process of Evolution of Geohydrodynamic Systems of Aqueous-rocky Draws

The article is about the peculiarities of interference of ground water with massive materials, gases, organic substances, as well as interference of new formations of hydrocarbon fluids with massive materials and waters on the different stages of evolution of aqueous-rocky draws and transformation of the types of geohydrodynamic systems.

New taxa of Hexactinellida (Porifera) from the Upper Cretaceous of Russia and Ukraine

New taxa of hexactinellid sponges: Umbrelliserus olferjevi, gen. et sp. nov. (Coeloptychiidae) from the Maastrichthyan of the Volga river basin, Russia and Turbiplana nerodenkoi, gen. et sp. nov. (Leptophragmidae) from the Cenomanian of Ukraine are described. Study of skeletal remains of the described sponges allows to confirm proposed earlier basic trends in morphogenesis of the Upper Cretaceous hexactinellids. It also is evidence of reliability of worked out principles of Cretaceous Hexactinellida systematic on a familial level.

Carbonate Nodules in the Middle Jurassic Section from the Lower Volga Region

Carbonate nodules have been examined – those forming numerous lenticular chains of diverse lengths at each hypsometric level in the Middle Jurassic deposites. Contrary to the current view of the siderite composition of the nodules, dominant calcite development is proved, with siderite and clay matter involved. The material composition of the nodules is characterized by substantial variations of the component concentrations. Inherent peculiarities of the mineral and of the chemical compositions have been revealed in each suite, alongside with specific textures.

Environment of Halogen Rock Formation in the Region of the Gremyachinskoye Sylvinite Field

The Gremyachinskoye sylvinite field lies in the south of the Volga monocline, to the northeast of the Severo-Kotelnikovskij overthrust. Halogen beds from the field were examined. The study has provided grounds for correlating the field potassium-bearing horizon with the Pogozhskaya rhythmic member from the Volga monocline. The halogen bed formation was influenced by the principal water area of the salt-generating basin in the east and by the calcium chloride brines discharged along the disjunctive dislocations limiting the overthrust zone.

Natural and Artificial Drainage Networks of Saratov: Modern State and Relation

Problems of modern urban drainage network functioning have been considered. Analysis of geoecological state of separate regions of urban erosive and drawn systems has been carried out. An approach to the optimization of natural and artificial drainage networks has been suggested by the example of Saratov territory. 

The End-Permian Mass Extinction Events on Land in Russia

The mass extinction of life in the sea and on land 251 million years ago, at the Permian-Triassic boundary, was undoubtedly the largest mass extinction of all time. Sedimentological and geochemical evidence shows that global temperatures rose, that there was extensive oceanic anoxia, and that there was massive erosion of sediment, especially soils, from the land. These phenomena might have been a consequence of the massive eruptions of the Siberian Traps, which produced carbon dioxide, and greenhouse gas, as well as acid rain, which killed plants and led to stripping of soils.

Paleogeographic Interpretation of the Taphonomy of the Principal Middle and Upper Permian Ichthyofauna Locations from European Russia

Paleogeographic reconstructions of sedimentation settings have been substantially refined from the taphonomic data from the ichthyofauna localities; the Permian fishes from East Europe have lately acquired the orthostratigraphic status. The taphonomic research in a number of the Middle and the Late Permian ichthyofauna locations has largely confirmed the reality of existence of fairly extensive sedimentation basins over European Russia in the Kazanian, the Urzhumian and the Severodvinian ages; those basins used to be periodically connected with the World Ocean. 

Condition of a Level of Scrutiny Gulling in Territory of Saratov and Vicinities

On the basis of the analysis of the literature on studying gulling in territory of Saratov and vicinities the basic techniques and results of researches for more than 130-years period, and also directions of modern studying are noted. The modern level of a level of scrutiny gulling territories is certain. 

Features of the Permian and Triassic beds in the supersalt complex from the Gremyachinskoye potassium salt field

Study of the supersalt beds from the Gremyachinskoye sylvinite filed has shown the sections of both, the Permian and the Triassic beds to be curtailed relative to other areas of the Pricaspian Depression. Fragmentary parts of the Middle and of the Upper Permian beds have been revealed alongside with the Lower and the Middle Triassic, missing upper Triassic beds and the traces of the Upper Jurassic deposits.

Stratigrafy of Santonian-Campanian Deposits of South-Easten Russian Platform on the Example of Section Separation Near the Village Mezino-Lapshinovka and the Problem of Intrasantonian Boundary in the Saratov Volga Region

The results of interpretation of biostratigraphic separation of santonian-campanian deposits of the Saratov right-bank Volga region, on the example of earlier conducted detailed and complex investigation of separation near the village Mezino-Lapshinovka have been presented. The ideas of realiability of variants of the detailed (on the level of subtages) subdivision of santonian substage in reference to the territory of the Volga right-bank have been given. 

Mesozoic-Cenozoic Oversalt Deposits from the Gremyachkinskoye Sylvinite Field

The authors consider compositions of the rocks penetrated with the Well NO 13 in the Gremyachkinskoye sylvinite field, Volgograd Region. Varied complexes of terrigenous, ciliceous and carbonate rocks, alongside with their mixed varieties rhythmically alternate there over the Late Cretaceous, Paleogene, Neogene and Quaternary sections. Reconstructions have been made of their generation settings within marine basins; the basin evolution during that lengthy period used to be associated with periodic manifestations of tectonic events of both, global and regional scales. 

Stratigraphy of the Baojcian-Bathonian Marine Deposites of the Volga Region

There are unceptainties in the boundaries, extensions and ages of the suites recognized in the recent regional stratigra-phic chart for the Middle Jurassic of the Saratov and Volgograd Volga right-bank Regions. Analyses of the new factual materials acquired from numerous well cores and the data from the outcrops in the stratotype locality at the North Vol-gograg Region make the basis for elaborating the deposite division. Detaled lithologic and paleontologic characteristics, their thicknesses and areals are estimated over Volga right-bank Region. 

Unique Steppe Natural Complexes of the Left Bank Volga River in Saratov Region

According to field researches of the Left bank Volga river in Saratov region in article are shortly presented descriptions of two steppe sites which are unique for this strongly agriculturally transformed territory. The inference are made about necessity of special researches around there, because it is the most perspective for search steppe protected areas. 

Aspects of Modern Higher Education

High school and specifically – professional geological education go through the period of essential structural and profound reformation. The modern state of components of higher professional education has been considered. The ideas about disappearing components of this system and probably the fact that can change them have been stated. 

About Possible Reflexion of Paleocological Conditions in Petromagnesism of Kallovian - Oxfordian Deposits of Dubki Section (Saratov)

As a result of the complex analysis of petromagnetic, micro- and macrofaunistic data of deposits on the Kallovian – Oxfordian boundary of Dubki section (Saratov), which is one of candidates for a role of a Global Boundary Stratotype Section and Point of Oxfordian boundary (GSSP), it is established significant correlation between magnetic susceptibility variations and changes of an abundance, a specific variety of ostracodes, foraminiferes and ammonites.

Local Stratigraphic Units of the Middle Carboniferous Moscovian Stage from the Volgograd-Saratov Volga Region

Analysis of the published factual materials from the Lower Volga region has made it possible to distinguish and to describe eight local stratigraphic units of the Middle Carboniferous Moscovian stage. Lithologic and paleontologic characteristics of the suites and the subsuites are presented alongside with indications of the stratotype sections in particular wells. In the summary, the local stratigraphic units from the Lower Volga Region are compared with the stratotypes from the Moscow Region. 

Mineralogical and Paleogeothermal Criteria for Predicting Oil and Gas Contents from the Rift Sedimentary Basins

Clay minerals and their parageneses make sensitive indicators of diverse processes involved in transformation of the Valanginian terrigenous rocks in the North Khalmerpayutinskaya field by hot solutions. The latter ones used to form hydrothermal-metasomatic reservoirs and to transport HC. The amounts of mixed-layer bodies and the proportions of swelling (smectite) and non-swelling (chlorite, micaceous) constituent packages make it possible to estimate the trap quality and the probability of HC presence.

Kinematics of the Electromagnetic Waves from the Second-type Seismoelectric Effect in Two-layered Earth

Analysis of the traveltime curves of the principal types of the electromagnetic waves from the second-type seismoelectric effect was used to demonstrate the possibility of using the kinematic characteristics of that effect fields for studying aquifer locations. 

Geological-tectonic interpretation of gravity-magnetic information in development of regional geophysical profiles (for example: the profile «Uvarovo – Svobodniy»)

The article deals with the results of geological interpretation of geophysical data received during traversing («Uvarovo – Svobodny» line, the length is 376 km). Integrated gravitomagnetic installations alongside were applied during the process of interpretation. The new tectonic elements were found, and previously found tectonic elements were confirmed. More accurate information about location of the border separating the mentioned tectonic elements was obtained. 

Compaarative Analysis of the Thinly Dispersed Components of the Triassic and Jurassic Sediments from the Caspian Region Aimed at Revelation of the Paleogeografic Settings

Indicators of sedimentogenesis have been established for paleogeographic reconstructions based on ecosystem-nanostructural analysis of finely dispersed sediments. The Early Triassic Olenekian sediments have disclosed some features of primary food chains peculiar for marine basins within the landscapes previously regarded as continental ones. Those have been classified as plains periodically flooded by sea. The coccolith- and ostracod-bearing sediments from epicontinental basins have been recorded in the Middle Triassic sections.

Pages