Geology

Permian and Triassic Fish Holotypes Kept in the Earth Sciences Museum at the Saratov State University. Article 1. Dipnoian and Elasmobranchian Fishes

The paper presents the first review of the Permian and Triassic fish holotypes belonging to two classes (Sarcopterygii and Chondrich Chondrichthyes), recognized by the authors upon collecting and examining ichthyofauna bone remains from the sections within the East European Platform and the adjacent regions. Starting from the 1960-ties, 3 genera and 26 species of those fishes have been defined and used alongside with actinopterygian fishes to compile stratigraphic charts of the Permian and Triassic from European Russia and to make paleogeographic reconstructions.

Petromagnetic Indicators of Layers with High Concentration of Cosmogenic Substance in Maastrichtian of Volga Region and Cis-Caspian Region

The level with anomalous high values of natural remanent magnetization and Koenigsberger ratios was identify in the Upper Maastrichtian of Vol’sk depression (Saratov Volga Region). The microprobe studies of samples from this layer registered elevated concentrations of microparticles of iron, nickel, intermetallics and magnetite spherules of cosmic genesis. Similar petromagnetic anomaly was detect in the uppermost of Maastrichtian in the South Cis-Caspian (Aktolagay Plateau, Kazakhstan).

Geochemical Conditions of the Development of Modern and Buried Soils of the Middle Volga Region

The article presents datas on the gross chemical composition of buried soils of Subatantic and Subboreal periods, that’s located on geosystems floodplain of the Middle Volga. Based on the evaluation of geochemical factors justified bioclimatic conditions of their development, as well as the peculiarities of the process of soil formation. The comparative geochemical characteristics of buried soils with their zonal analogues (leached chernozem).

The Early Carboniferous Volcanism in the Southeastern Precaspian Depression

The problem of Paleozoic volcanism in the southeastern Precaspian depression remains unsolved despite its relevance. Obtained by the authors results can be most adequately explained from the plate tectonics standpoint as the evidence of subduction and subsequent collision that created the Precaspian Basin southeastern framing.

Environment of Texture and Structure Formation in Potassium, Potassium-magnesium and Magnesium Salts within the Caspian Halogenic Basin

The paper deals with the role of the factors that determine the texturalstructural peculiarities of potassium, potassium-magnesium and magnesium salts in the Caspian halogenic basin. Special reference is made to the role of highly concentrated brine preservation in certain basin water areas, importance of constant inflow of low condensed brine, salting-out of sodium and potassium chlorides, basin bottom morphology, the influence of two types of sedimentation rhythmicity (halogenic and terrigenous) and secondary processes of mineral formation.

Assessment of Critical Loads due to the Negative Form of Technogenic Relief

The article is devoted to the plane problem of appraisal critical effort, appearing in a flaky- horizontals model of a weak grunt environment under the influence of loading, the kind of which has a form of an symmetrical triangular and semi-infinite combined load.

Petrogenic Water, Hydrothermal Process and Oil Migration in a Tectonically Activated Buried Continental Rift (West Siberia)

It was established that with convective heat and mass transfer in the region of the Krasnoleninskij swell (West Siberia), the pulsating lateral pressure regime used to contribute to interlayer water avalanche liberation from the Upper Jurassic-Lower Cretaceous smectites in the process of their hydromicatization. The resurgent (petrogenic) water constituted the basis of the hydrothermal solutions responsible for the processes of ultra-acid leaching, metasomatosis, hydrocarbon generation and migration.

Features of Rhythostratigraphy of Halogen Thicker and Paleogeographic Conditions of Potassium-Magnesium Mineralization in the Southwestern Deadlock Part of North-Caspian Halmeic Basin

Provides rhythmostratigraphic characteristic of Lower Permian halogen formations of Western monoclinal part of the North-Caspian halmeic basin. Paleogeographic conditions of accumulation of potassium and magnesium and magnesium deposits in the Volga Monocline and the southern deadlock part that holds Gremyachinskoe deposit and related search sites: Darganovskiy and Ravninniy are considered.

Estimation of Soil Cover mobile and total Forms of heavy Metals Pollution in Zone of Guselskogo Landfill Solid waste Influence (Saratov)

The studies to determine the concentration of mobile and total forms of heavy metals. Assessed by an excess of total and mobile forms of heavy metals in the soil cover over the set of MPC and evaluated geochemical transformation of soils by analyzing their total fertility heavy metal pollution.

Hydrocarbon natural tectonic Pump and secondary dolomitization as a Result of tectonic-hydrothermal Activity in a rift sedimentary Basin

The linear trend of secondary dolomitization development within the Tevlinsko-Russkinskoye field has been found to traverse the tectonically contrasting, closely adjacent and hydrodynamically  interconnected compression-tension zones. This provides rationale for origination of a natural tectonic pump in the field.

Pages