Tectonic stratification of the Alpine cover of Greater Caucasus Mountains within the boundaries of Azerbaijan

Based on interpretation of latest geological and geophysical research data on mountain and foothill South-East Caucasus the thesis serves to summarize information on earth crust structure and to correlate the regions deep and surface structure. Resultanly the different interpretation of regional tectonics is given and regions tectonic zonation is implemented with the deployment of new approach. The research has identified the reflection of tectonic stratification in the structure of alpine sedimentary cover and prejurassic basement. At the level of pre-Jurassic basement observed are the tectonic blocks (steps) of Caucasus trend. It is stipulated that the entire alpine cover to include its consoliated basement is subject to tectonic stratification. The thesis describes the one-side shift of the rock masses with their tectonic stratification into several cover complexes overthrusted upon each other in the North-South direction, as reflected in the internal structure of alpine sedimentary cover. Overthrust emergency is deemed a longtern and staged process and correlated with different phases of alpine deformations. The thesis is first to describe the tectonic cover complexes emerged within the three substages of later Cimmerian, Austrian, Laramian, Rodanian and Valakhian tectonic phases. Separate well-known tectonic covers dislocated in the southern slope of the South-East Caucasus are an integral part of Govdag-Sumgait overthrust. These covers underlay the young Pliocenic-Holocenic rocks of the Absheron peninsula and continue towards waters of the Caspian Sea. The research was first to track the location of tectonic cover complexes within the oundaries of Caspian mega-depression. The creation of different age tectonic cover complexes is a result of longterm pseudo-subduction correlation between Southern and Northern Caucasus microplates. Such interpretation of alpine cover tectonics helps determine hydrocarbon exploration areas in South- East Caucasus, and identify tectonically screened deposits confined to the deep faults and flat foots of the cover complexes. Additionally the tectonic layer movements occurred at the slide surface and fault knots are studied among causes of latest seismicity.    

19.04.2011     Print  Print