The use of the zonal-block model of the earth's crust for the construction of regional tectonic schemes and sections of the earth's crust based on a complex of geological and geophysical data makes it possible to consider the resulting maps and sections as tectonic models. The main elements of such models are blocks with an ancient continental base and interblock zones formed by complexes of island arcs, an accretionary prism, or oceanic crust. The developed geotectonic model of the Sea of Okhotsk region reflects the features of the deep structure, tectonics, and geodynamics. The Cimmerian Novosibirsk-Chukotka, Verkhoyansk-Kolyma, Kolyma-Omolon, and Amur folded regions and the Alpides of the Koryak-Kamchatka and Sakhalin-Sikhote-Alin folded regions are developed along the northern, western, and southern boundaries of the Sea of Okhotsk megablock with a continental crust type. From the east, the megablock is limited by oceanic basins and island arcs.
A rationale for the set of theoretical and methodological techniques of mapping and deep modeling in the Russian Arctic shelf and adjacent sedimentary basins in continental Russia is based on the materials for the Barents and Kara Seas region. This article provides the factual basis of the research and shows how to apply zonal-block model of the crust and generalized models of geodynamic settings in terms of the different geophysical data inconsistency. The necessity and approach for global and regional paleo-reconstructions are also discussed. It is shown that localization of the principal structural and compositional units of the lithosphere being a consequence of geodynamic processes at the boundaries of lithospheric plates, form at the basis of sedimentary cover and crystalline basement layered maps as well as cross-sections of the continental crust. The identified parameters of the deep structure and milestones of the regional tectonic history open new opportunities to explore the regularities of ore deposits distribution. The shown example of the forecast and metallogeny problems solution within Western Siberia and Khatanga-Vilyui petroleum provinces is made using the parameters of known industrial oil and gas fields for training the pattern recognition system.
Principal features of deep structure and composition of the lithosphere geostructures of the continental part of the Russian Federation territory are characterized within the radial-zonal model of the Earth’s crust. The principal units of the model are megablocks (paleoplites) with ancient layered continental crust and interblock megazones (structures of tension, compression and shear), separating them. The results of the geological-geophysical modeling are presented in the form of layer by layer deep structure schemes – of consolidated basement and of the platform cover and accompanied by a set of the earth's crust sections, carried out along regional profiles, performed with the application of a deep seismic sounding (DSS) method and reflected waves of common depth point (CDP) method.
Characteristic features of deep structure and composition of Ural (UFB) and Paikhoy-Novaya-Zemlia (PNZFB) fold belts, which were investigated with the use of results of geological and geophysical investigations along reference geophysical profiles (geotransects) are considered. In the structure of Uralian deep sections typical elements of collisional orogen are distinguished: deformed margin of submerged plate, suture zone and deformed margin of override plate. Participation in the process of the Late Paleozoic collision more than «Baltic» и «Kazakhstan» plates, but micro plates of continental type lead to complication of typical model of collision orogen due to inclusion into the UFB deep structure additional blocks and suture zones. PNZFB zonality is not typical for classical collision orogens. Fold-thrust belt on the «Svalbard» plate margin is modeled in its deep section. Intensity of the fold-thrust deformations decreases to relict oceanic basin, which is modeled in the basement of the South-Kara sedimentary depression.
Characteristic features of deep structure and petrophysical parameters of intraplate structures (hot spots, intracontinental rifts, inrtraplate basins and passive continental margins) are considered. Examples of the structures of Barents-Kara region and Eurasian continent north margin are presented.
The database of digitized regional electrical materials is described. The database covers territories of Ease-European platform and adjusting fold areas (Kuakas, east flank of Uralian fold area, Skiff plate and Timan-Pechora region of Barents fold area). Besides of primary information, the database includes resulting geoelectric maps and sections. The results of their experimental geological interpretation show, that geoelectric data provide: modeling of sedimentary cover which is adequate to seismic data; modeling of blocks and interblock (suture) zones boundaries, which is more reliable that seismic data interpretation; separation of ancient volcanogenic-sedimentary layer in the upper part of the consolidated crust.
