GRENVILLE ZONAL BARROW-TYPE METAMORPHISM IN THE ISHERIM ANTICLINORIUM (NORTHERN URALS)
https://doi.org/10.5800/GT-2025-16-6-0860
EDN: PMKNED
Abstract
The relevance of the work is determined by a poor knowledge of metamorphic processes in the Precambrian complexes of the Urals. The object of the study is the Belokamenka metamorphic complex of the Ishemir anticlinorium of the Northern Urals. The aim of the work was to characterize and determine the PT-parameters of metamorphic transformations of the rocks of the Belokamenka complex based on the analysis of mineral and rock compositions. PT-estimates were obtained by applying the multi-equilibrium geothermobarometry (winTWQ) method. To determine the general patterns of metamorphic mineral formation, PT-diagrams of phase equilibria were also calculated based on the minimization of the Gibbs energy. The peak metamorphism parameters – T=619 °C, P=7.4 kbar – were determined, and a conclusion was made about the progressive nature of the metamorphic process in the E-W trending, regular lateral zones of chloritoid, chlorite, staurolite and kyanite. The medium-temperature moderate-to-high-pressure type of metamorphism revealed for the Belokamenka complex, which dates back to 973±49 Ma, allows us to associate it with the areas of manifestation of the Grenville orogeny.
Supporting agencies: The research was conducted in accordance with the topic of the state assignment of the IGG UB RAS (project No. 123011800013-6) using the equipment of the Shared Research Facilities "Geoanalyst" of the IGG UB RAS, and the topic of research work of the IPGG RAS (No. FMUW-2022-0002) of the Ministry of Science and Higher Education of the Russian Federation.
About the Authors
G. A. Petrov
Zavaritsky Institute of Geology and Geochemistry, Ural Branch of the Russian Academy of Sciences
Russian Federation
Competing Interests:
Russian Federation
15 Academician Vonsovsky St, Ekaterinburg 620016
Competing Interests:
The authors declare that they have no conflicts of interest relevant to this manuscript.
S. K. Baltybaev
Institute of Precambrian Geology and Geochronology, Russian Academy of Sciences ; Saint Petersburg University
Russian Federation
Competing Interests:
Russian Federation
2 Makarov Emb, Saint Petersburg, 199034
7-9 Universitetskaya Emb, Saint Petersburg 199034
Competing Interests:
The authors declare that they have no conflicts of interest relevant to this manuscript.
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For citations:
Petrov G.A., Baltybaev S.K. GRENVILLE ZONAL BARROW-TYPE METAMORPHISM IN THE ISHERIM ANTICLINORIUM (NORTHERN URALS). Geodynamics & Tectonophysics. 2025;16(6):860. (In Russ.) https://doi.org/10.5800/GT-2025-16-6-0860. EDN: PMKNED
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