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CSPG Special Publications

Abstract


Pangea: Global Environments and Resources — Memoir 17, 1994
Pages 145-154
Regional Paleogeography and Tectonics

Structural Relationship of the Northern Urals and Adjacent Basins

Konstantin O. Sobornov

Abstract

Interpretation of recently acquired geological and geophysical data in marginal zones of the Northern Urals provides constraints on structure of this thrust belt. Results indicate that the Northern Urals - Timan-Pechora basin transition is marked by a buried thrust belt which consists of an allochthonous assemblage of west-verging thrust sheets. These sheets are inserted into the foreland basin along upper Artinskian (Lower Permian) shales. Tilting of overlying Permian-Triassic strata and the regional unconformity between Triassic and Jurassic deposits imply that the tectonic wedging terminated in the Triassic-Early Jurassic. Interpreted geometry of the area suggests that 50 km or more of horizontal shortening occurred along the buried thrust belt front. In contrast to the western flank of the Northern Urals, the eastern is dominated by normal faults. These faults cut the Paleozoic-Triassic section. Minor compressional deformation and truncation of these rocks by overlying Jurassic-Tertiary deposits of the West Siberian basin suggest uplift and erosion of this area in the Late Triassic- Early Jurassic, probably simultaneous with wedging of the Urals thrust belt front into the foredeep basin. Folding of Paleogene deposits in the Urals-West Siberia transition zone provide evidence for Tertiary reactivation of the older faults along the Urals.

Estimates of horizontal shortening across the Northern Urals foreland thrust belt (100 km or more) indicate that this belt represents an allochthonous crustal-scale nappe pile underlain by cratonic basement of the East European platform.


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