First results of U-Pb dating of detrital zircon from terrigenous rocks of the Obeiz Formation of the Subpolar Urals: isotope age and possible provenance sources
https://doi.org/10.24930/2500-302X-2025-25-3-506-520
EDN: EMXUMM
Abstract
Research subject. Lower Paleozoic terrigenous deposits of the northern part of the Lyapin anticlinorium in the Subpolar Urals.
Materials and methods. From the quartzite sandstones of the Obeiz Formation, which lies in the lower part of the Paleozoic section of the area under consideration, a monofraction of detrital zircon grains was isolated and their optical and isotope-geochronological U-Pb (LA-SF-ICP-MS) studies were carried out.
Results. The analysis of the distribution of age values of zircon grains, taking into account their morphological features, revealed the internal structure and geochemical characteristics, the presence of four age populations of this mineral. Probable sources of the removal of terrigenous material were shown, and the age of formation of the Obeiz Formation was clarified.
Conclusions. According to the available paleontological (for the overlying sediments) and newly obtained isotope-geochronological data, the Obeiz Formation is of Early Ordovician (Tremadocian-Floian). Clastic material entered the sedimentation area mainly from local sources of sediment, i.e., nearby massifs of granites and granodiorites. The source of redeposited clastic material was mainly the underlying terrigenous sediments of the Moroi Formation (RF3) and Alkesvozh Formation (Є3-O1).
Keywords
Supporting agencies: The work was carried out within the framework of the state assignment of the Institute of Geology FRC Komi SC Ur Br RAS “Deep structure, geodynamic evolution, interaction of geospheres, magmatism, metamorphism and isotope geochronology of the Timan-Severouralsk segment of the lithosphere” (No. 122040600012-2).
About the Authors
O. V. Grakova
Institute of Geology, Komi Science Center UB RAS
Russian Federation
Russian Federation
54 Pervomaiskaya st., Syktyvkar 167982
A. M. Pystin
Institute of Geology, Komi Science Center UB RAS
Russian Federation
Russian Federation
54 Pervomaiskaya st., Syktyvkar 167982
E. V. Kushmanova
Institute of Geology, Komi Science Center UB RAS
Russian Federation
Russian Federation
54 Pervomaiskaya st., Syktyvkar 167982
V. B. Khubanov
N.L. Dobretsov Geological Institute, SB RAS
Russian Federation
Russian Federation
6a Sakhyanovskaya st., Ulan-Ude 670047
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Review
For citations:
Grakova O.V., Pystin A.M., Kushmanova E.V., Khubanov V.B. First results of U-Pb dating of detrital zircon from terrigenous rocks of the Obeiz Formation of the Subpolar Urals: isotope age and possible provenance sources. LITHOSPHERE (Russia). 2025;25(3):506-520. (In Russ.) https://doi.org/10.24930/2500-302X-2025-25-3-506-520. EDN: EMXUMM
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