Tectonic evolution of the northern Ural Orogen

Abstract

The closure of the Uralian Ocean occurred in Early Permian-Early Triassic time. In the northern Ural fold belt, overthrusting to the west produced a major foreland basin to the west of the mountain chain. In contrast, in the northern extension of the Ural Orogen, the Taymyr fold belt, thrusting was directed to the SE. It is proposed that Novaya Zemlya, at the interface of these two zones, acted as a thin-skinned allochthonous nappe emplaced by gravity tectonics into a basin produced by rapid Permo-Triassic rifting in the eastern Barents Sea.

Petrogenesis and timing of mafic magmatism, South Taimyr, Arctic Siberia: A northerly continuation of the Siberian Traps?

“…Most tectonic models describe the Taimyr fold belt as a continuation of the Late Palaeozoic Ural orogeny (Zonenshain and Natapov 1989;Otto andBailey 1995, Vernikovsky, 1996), which is indicated by Carboniferous to Permian collisional granites in north and central Taimyr (Vernikovsky, 1996;Pease et al, 2015). This tectonomagmatic event records the suturing of north Taimyr to central/south Taimyr.…”

Geology and Assessment of Undiscovered Oil and Gas Resources of the East Barents Basins Province and the Novaya Zemlya Basins and Admiralty Arch Province, 2008

“…Regional seismic profiles across the North and South Barents Basins (figs. 3B, 3C) show none of the asymmetric basin geometries typically associated with foreland basins (Otto and Bailey, 1995;O'Leary and others, 2004). Instead, the Permian and Triassic stratigraphic succession thickens westward rather than eastward toward Novaya Zemlya, as would be expected in a foreland-basin setting (figs.…”

“…B. II-II', modified from Johansen and others (1993). C, III-III', modified from Otto andBaily (1995), after Baturinn andothers (1991). D, IV-IV', modified from Johansen and others (1993).…”

“…Mild compression during the Oligocene and Miocene produced limited inversion and uplift along preexisting faults (Otto and Bailey, 1995) and on the former Lomonosov Rift shoulder along the present-day shelf edge from Svalbard to Severnaya Zemlya. Estimates of Cenozoic uplift range from 200-1,500 m to as much as 2,000-3,000 m (Johansen and others, 1993;Otto and Bailey, 1995;Musatov, 1999;Ryabukhina and others, 1999). Paleogene and Neogene mudstone is preserved only locally in the North and South Barents Basins because of erosion elsewhere.…”

“…This nappe, which overrode the eastern margin of the East Barents Basin ( fig. 3C), might have promoted the formation of the Ludlov Saddle by transpression and inversion (Otto and Bailey, 1995;Bogdanov and others, 1997;Lopatin and others, 2001). Structures on the eastern margin of the East Barents Basins consist of a series of thrustrelated folds (G.F. Ulmishek, oral commun., 2008) or anticlines (Otto and Bailey, 1995), including three large highs, the Krestov, Admiralty, and Pakhtusov (Nikitin and others, 2000).…”