Tectono-depositional history of the Central Russian aulacogen and Moscow syneclise

The modern structure of the Central Russian region was formed by tight and long-term (hundreds of million years) interaction of tectonic and sedimentary processes in the upper crust and sedimentary cover. Petrophysical properties of the Paleoproterozoic crust predetermined the area for the development of regional strike-slip faults and aulacogen grabens in the Neoproterozoic. The transfer displacement of the aulacogen axis at the end of Riphean led to the partial erosion and redeposition of the preplate cover and caused the subsequent structural asymmetry of syneclise. The development of reversed structures in the plate cover (Sukhona mega swell) was caused by the slower subsidence of comparatively lighter fragments of the aulacogen crust relative to the surrounding frame.     

Structure of Spreading Segments of the Mid-Atlantic Ridge between the Arkhangelsky and Bogdanov Transform Faults,Equatorial Atlantic

Geotectonics - The paper presents new data on the Doldrums megatransform fault located in the northern Equatorial Atlantic (6.5°–9° N), which consists of four transform faults with...     

Evolutionary Stages of Riphean Sedimentary Basins in the Central East European Platform (with Kresttsy and Pavlov Posad Sedimentary Basins as an Example)

The Riphean Kresttsy and Pavlov Posad sedimentary basins, which occupy different positions in the East European Platform (EEP) are considered. Compositional features of terrigenous–mineral associations (TMA) of sedimentary complexes in these basins and their relation to the intrabasin and external sources of the detrital material are revealed. Two (preaulacogen and aulacogen) stages in the development of Riphean sedimentary basins in the central EEP are established. Relics of preaulacogen sequences are recorded only at the base of the sedimentary succession in the Pavlov Posad basin. These two basins formed at the aulacogen stage under an influence of strike-slip stresses. Aulacogen sequences of the Pavlov Posad basin formed in one stage, whereas sequences of the Kresttsy basin accumulated during two stages.     

Problems of the relationship between lithology and tectonics in the study of sedimentary basins

Interrelation of tectonic and sedimentary processes is realized at different hierarchical levels (from a common geodynamic setting of sedimentary basin to the behavior of its local structures) and at different stages of basin evolution (from sedimentation to rock formation). Based on several examples, the paper considers issues related to the reflection of tectonic processes in sedimentary sequence, the development of complex tectonosedimentation models of sedimentary basins, the identification of mineralogical-petrographical and petrochemical indicators of tectonic settings, as well as the study of mutual influence of tectonic and lithogenetic factors on the rock formation in the basins.     

Formation and Development Forecast of the Western Arctic as a Segment of the Atlantic–Arctic Rift System

Geotectonics - The article overviews the existing data and ideas about the structure of the Atlantic–Arctic rift system, the youngest segment of which is the Western Arctic. The main...     

Late Riphean Sedimentation in the Central Russian Aulacogen

Result of the analysis of combined structural, facies, mineralogical, and micropaleontological data suggest that the formation of the Central Russian Aulacogen was related to the evolution of a major strike-slip system in the Late Riphean on the Russian Plate. The strike-slip system led to the formation of parageneticaly interrelated structures: central anticlinal uplift framed by two troughs (structurally isolated echelon of lake-type sedimentary basins). The structural pattern of Late Riphean riftogenesis was responsible for the isolation of the sedimentation system. The variable intensity of extension at opposite flanks of the aulacogen is reflected in the fanlike form of the present-day structure and composition of sedimentary complexes, particularly the presence of red-colored molasse in the widest (southwestern) part of the study region. The growth of the central uplift is inferred from the enrichment of heavy fraction in epidote from blastomylonites derived from the lithostructural framing (rocks of the tectonic melange).