Abstract
The geodynamic development of the north–western (Arctic) margin of the Siberian craton is comprehensively analyzed for the first time based on our database as well as on the analysis of published material, from Precambrian-Paleozoic and Mesozoic folded structures to the formation of the Mesozoic-Cenozoic Yenisei-Khatanga sedimentary basin. We identify the main stages of the region’s tectonic evolution related to collision and accretion processes, mainly subduction and rifting. It is demonstrated that the prototype of the Yenisei-Khatanga basin was a wide late Paleozoic foreland basin that extended from Southern Taimyr to the Tunguska syneclise and deepened towards Taimyr. The formation of the Yenisei-Khatanga basin, as well as of the West-Siberian basin, was due to continental rifting in the Permian-Triassic. The study describes the main oil and gas generating deposits of the basin, which are mainly Jurassic and Lower Cretaceous mudstones. It is shown that the Lower Cretaceous deposits contain 90% of known hydrocarbon reserves. These are mostly stacked reservoirs with gas, gas condensate and condensate with rims. The study also presents data on oil and gas reservoirs, plays and seals in the Triassic, Jurassic and Cretaceous complexes.
Highlights
The structures of the north–western margin of the Siberian craton have attracted the attention of geologists for over a hundred years [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15] and many others
In this paper we present our point of view on the geodynamic history of the north–western margin of the Siberian craton and the formation of the Yenisei-Khatanga basin
To demonstrate the tectonic evolution of the north–western margin of the Siberian craton we propose our own version of paleotectonic reconstructions (Figure 5) [25]
Summary
The structures of the north–western margin of the Siberian craton have attracted the attention of geologists for over a hundred years [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15] and many others. The thickness of these units is significantly greater than the thickness of the sedimentary infill of the Yenisei-Khatanga basin itself [21,22] The formation of these complexes is directly linked to the evolution of the northern margin of the Siberian craton: The change from a passive continental margin setting to an active one in the Neoproterozoic, followed by the formation of the Taimyr-Severnaya Zemlya fold-and-thrust belt in the late Paleozoic, and of the Yenisei-Khatanga rift system in the Permian–Triassic. Geophysical data indicate that the total thickness of effusive-sedimentary late Permian–Early Triassic series of the rifting stage reaches 2–3 km [53] They have been penetrated by wells in the western part of the Yenisei-Khatanga basin on the Malaya Kheta, Dolgan, Sukho-Dudinka and Volochan areas [18] (Figure 4). Magenta and yellow dashed lines show the approximate boundaries of the Yenisei-Khatanga basin
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