| Abstrakt: |
A review of the materials obtained over the past decade on the geology and tectonics of the North Urals and its continuation in the basement of the West-Siberian Plate allows us to clarify and supplement characteristics of the geological features of the region, and substantiate our new conclusions. We suggested more precise vertical division of complexes developed in the region into structural stages: Archean‒Paleoproterozoic, Riphean‒Vendian (Timanides), Paleozoic‒Early Jurassic (Uralides, which consist of the Uralide sensu stricto and the Old Kimmerian sub-stages), platform, and the neo-Orogenic stages. New data were presented in support of the initially unified island-arc nature of the Schuchya, Voikar, and Khulga areas of the Tagil arc sensu lato, while an alternative interpretation of the origin of zircon clusters from volcanic-sedimentary island-arc complexes, for which the mantle but not microcontinental source was supposed, is given. A complex orocline structure of the Ural‒Pai-Khoi bend of the primarily linear island arc due to the two-stage collision of the arc with the continent in the Early Carboniferous and then in the Early Jurassic, is characterized. Using PUT sesmic transect and drilling data allowed us to clarify the synform structure of the axial part and the eastern limb of the Tagil synclinorium and its transition to the East Urals zone. New data have been obtained confirming the existence of a northwestern tectonic boundary under the central part of the Yamal Peninsula, which corresponds to the contact of the Paleozoides and the submerged part of the Siberian Platform. An abnormally high concentration of hydrocarbon deposits on the Yamal Peninsula are associated with the presence of rift junction intensively developed over the superplume branch and high-density heat flow, which characterizes the zone of high geodynamic activity permeable to deep fluid-gas flows. [ABSTRACT FROM AUTHOR] |
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