Geology

Colonial Level of Modular Organization in the Late Cretaceous Hexactinellids (Porifera). Genuine Colonies

Tendencies of morphogenesis in the Late Cretaceous modular forms contributed to formations of complexly structured secondary (genuine) colonies. Skeletons of genuine colonial sponges differ not just in numerous and diversely arranged equivalent oscula-carrying modules, but in the presence of the module connecting elements – junctions, as well. Characteristic elements of genuine colony skeletons – ostia – have been recognized between the modules and the junctions.

Использование микробиологических показателей в эколого-почвенном мониторинге города Медногорска

Проведена микробиологическая индикация техногенно нарушенных почв г. Медногорска на основе оценки численности гетеротрофных, железо- и марганецокисляющих бактерий. Установлена взаимосвязь между высоким значением показателя коэффициента магнитности в почвах и повышенным содержанием железоокисляющих бактерий, что свидетельствует о возможности использования данной группы микроорганизмов для мониторинга загрязненных тяжелыми металлами почв

Terrigenous-mineralogic Characteristics of the Bobrikovskian Horizon from the Saratov Trans-Volga Region: Paleogeographical Aspects

Terrigenous-mineralogic characteristics of the Bobrikovskian horizon within the Saratov Trans-Volga Region is provided in terms of the Berezovskaya group of rises. The quantitative and the qualitative composition changes of the heavy fraction minerals within the section have been determined. The lack of abrupt, intermittent changes of any material composition characteristics testifies to the section relative continuity. Examination of the mineral composition has provided the basis for specifying terrigenous-mineralogic associations in the Bobrikovskian deposits.

Magnetic Structures as Indicators Some Features of Formations of Tithonian-Berriasian Rocks in the Mountain Crimea

Anisotropy of magnetic susceptibility was measured in ~ 1,300 samples from 10 sections of the Tithonian-berriasian of the Central and Eastern Crimea. In consequence of the analysis of magnetic structures were found different degrees of tectonic deformation of rocks and corrected geological structure of explored area

Main Features of the Permian Halogenesis Hydrochemistry in the Caspian Region

In 1960–1980, the Elton and the Gremyachka deposits of potassium salts were discovered within the Permian halogen sequences in the Lower Volga Region, bischofite presence was recorded in the Privolzhskaya monocline, the conditions of halogen-bed formation were defined as those peculiar for typical evaporites. But in 1980-2010, halogenesis hypotheses emerged that denied the principal importance of climatic factor and the dominant role of oceanic waters in the brine composition of the salt-generating basin.

Earth’s Response to Orbital Excitation and Hierarchy of Climatic Events and Rock Cyclites Over the Recent Time

Analysis of the published material has made it possible to show the cyclic variations of the earth’s response to be practically coincident with the orbit parameter fluctuations, when the time lag of 5–6 thousand years is considered. In the earth’s response, however, periodicity changes are more complicated due to resonance phenomena and to numerous feedbacks in the system responsible for additional period occurrences.

Ecological and Geochemical Research on Soil and Estimate of Dusting in the City of Volsk (the JSC ≪Volskcement≫ Affection Zone)

Considered the results of ecological and geochemical soil sampling and made the estimate of dusting in the ≪Volskcement≫ cement producing plant affection zone (the city of Volsk, Saratov region), which is the city-forming company and also the main source of environmental impact

Neogenesis in Structure of Skeletons of Late Cretaceous Sponges Contributed to the Formation of Polyosculumic Forms

Arterial directions in formation of module organization of skeleton hexactinellids are caused by vegetative forms of reproduction. It is supposed that some tendency of selection of protozoa module forms can be traced in morphogenesis of separate generic types of late Cretaceous sponges. The concept “polyosculumic„ sponges is considered in vast context personally in reference to skeletons with some osculumics formed in the result of partial regeneration of organism

The Bajocian‑Bathonian Key Section from the Malyj Kamennyj Gully (the North of the Volgograd Region)

The following sequence from the Kamennyj gully (Volgograd Region) has been shown to occur in the section, upwards from below: a sand member as the lower portion of the Late Bajocian alluvial Gnilushkinskaya suite; the upper (clayey) part of the overlying littoral Karaulinskaya suite, referred to the Upper Bajocian Pseudocosmoceras michalskii biozone; fragments of a complete section of the Lower Bathonian Zhirnovskaya suite (Gonolkites convergens zone), with the clays deposited under the normal shallow sea conditions; the upper part of the Middle Bathonian Kamenno-Ovrazhna

Synsedimentation Hydrothermal Processes as Event Indicators for Interregional Correlations of Triassic Sequences

Event stratification of the sections constitutes an investigation trend aimed at detailed interregional correlation of sedimentary sequences. Based on extensive factual material, the authors have revealed the most significant changes in the Middle Triassic sedimentary and volcanogenic-sedimentary bodies. The entire Middle Triassic is peculiar for manifestations of hydrothermal-metasomatic processes within terrigenous, biogenic, volcanogenic bodies and bodies of mixed origins.

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