The Shirokoe Place as a reference section of the upper Visean substage in the Upper Pechora basin (Unya river, Northern Urals)
https://doi.org/10.24930/1681-9004-2021-21-2-207-221
Abstract
Research subject. Carbonate rocks in the “Shirokoe Place” section (Unya River, Northern Urals). Material and methods. The work was based on a study of the composition and structural peculiarities of rocks and species diversities of forami- nifera and calcareous algae in the most important section of Upper Visean sediments in the lower reaches of the Unya river.
Results. The rocks in the section are represented by bioclastic limestones, dolomites and various transition differences. The section features a wide presence of green Koninckopora, red Epistacheoides and Ungdarella algae. Less common are Palaeoberesella, Anthracoporella, Kamaena and Stacheoides. Fasciella is extremely rare, and Calcifolium is virtually absent. Foraminifera complexes are representative, but there are no zonal species Eostaffella tenebrosa (Venevsky horizon), genera Valvulinella (Tula horizon), Bradyina and Howchinia (Mikhailovsky and Venevsky horizons). Endothyranopsis, Janischewskina and Cribrospira are rare.
Conclusions. The study of the species diversity of foraminifera and calcareous algae allowed us to clarify the stratigraphic division of the upper Visean sediments in the “Shirokoe Place” section. The Tula, Aleksinsky, Mikhailovsky and Venevsky horizons of the Upper Visean were reliably identified. The studied section can be used as a reference when creating stratigraphic schemes of Later Visean deposits for the Western subzone of the Upper Pechora transverse sinking of the Western folded zone of the Urals and adjacent areas of the PreUrals regional trough.
Supporting agencies: The work was carried out as part of the State program projects No. AAAA-A17-117121270034-3 (State assignment IG FITS KSC UD RAS) and No. AAAA-A18-118052590025-8 (State assignment IGG UB RAS), as well as partial financial support from the fundamental research Program UB RAS, project No. 18-5-5-31 and No. AAAA-A18-118052590031-9
About the Authors
A. N. Shadrin
N.P. Yushkin Institute of Geology Komi Science Center, RAS
Russian Federation
Russian Federation
Andrey N. Shadrin
54 Pervomaiskaya st., Syktyvkar 167982
R. M. Ivanova
A.N. Zavaritsky Institute of Geology and Geochemistry, UB of RAS
Russian Federation
Russian Federation
Rimma M. Ivanova
15 Akad. Vonsovsky st., Ekaterinburg 620016
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Review
For citations:
Shadrin A.N., Ivanova R.M. The Shirokoe Place as a reference section of the upper Visean substage in the Upper Pechora basin (Unya river, Northern Urals). LITHOSPHERE (Russia). 2021;21(2):207-221. (In Russ.) https://doi.org/10.24930/1681-9004-2021-21-2-207-221
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