Structural patterns of Pre-Uralides in the Enganepe Uplift (Polar Urals) as a reflection of the Cambrian collision of Baltica and Arctida

Abstract

The East European Platform (EEP) is bordered by the Ural foldbelt of Hercynides on the east and the Pechora Plate (PP) with the adjacent Barents Sea shelf in the northeast. The upper horizons of the Earth’s crust in the Urals, PP, and Barents shelf are characterized by a two-level structure. The lower stratigraphic‐structural level consists of Late Precambrian complexes (Pre-Uralides‐Timanides), whereas the upper level is composed of Postcambrian complexes. In terms of the composition and structure, PreUralide‐Timanide complexes are subdivided into two groups [4]. The first group (southwestern Pre-Uralides‐ Timanides) is mainly represented by sedimentary rocks. These rock complexes outcrop in Timan and compose a part of the adjacent PP basement. In the southeast, the complexes are traced in the Urals (Kvarkush anticlinorium and Bashkir Uplift). In the northwest, they outcrop in the northeastern Baltic Shield (Kildin Island and Rybachii, Srednii, and Varanger peninsulas) and take part in the structure of adjacent areas of the Barents Shelf. The second group (northeastern Pre-Uralides‐ Timanides) includes not only sedimentary rocks, but also volcanic and volcanosedimentary complexes, granitoids, gabbroids, and rare ophiolites. These complexes make up the northeastern part of the PP basement and outcrop within several positive structures in the northern part of the western slope of the Urals (e.g., the Enganepe Uplift). The available arguments allow correlation of Late Precambrian complexes of the Wedel Jarlsberg Land (WJL) on southwestern Spitsbergen with the Pre-Uralide‐Timanide complexes. The