Age limits of basal deposits of the Upper Cambrian section of the Polar Urals according to the results of U-PB (LA-ICP-MS) zircon dating

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Abstract

Based on the results of mass U–Pb (LA-ICP-MS) dating of detrital zircon from the basal deposits of the Upper Precambrian of the Polar Urals, represented by the Nyarovei series, their lower age limit was established. The upper age boundary of the basal series was obtained from the U–Pb (LA-ICP-MS) dating of zircon from the overlying volcanogenic formations of the Nemyurugan suite. Thus, it has been established that the deposits of the Nyarovey series were formed in a narrow time interval at the end of the Late Riphean about 750–650 million years ago in the Arshinian time. Identification of the series as a Middle Riphean straton is erroneous. The dominant role in the formation of the deposits of the Nyarovey series belonged to the products of erosion of nearby massifs of crystalline rocks, fragments of which are probably polymetamorphic complexes protruding in the Harbei-Marunkeu anticlinorium in the Polar Urals.

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A. M. Pystin

N.P. Yushkin Institute of Geology, Komi Scientific Center, Ural Branch of the Russian Academy of Sciences

Author for correspondence.
Email: pystin.48@mail.ru
Russian Federation, Syktyvkar

O. V. Grakova

N.P. Yushkin Institute of Geology, Komi Scientific Center, Ural Branch of the Russian Academy of Sciences

Email: pystin.48@mail.ru
Russian Federation, Syktyvkar

Yu. I. Pystina

N.P. Yushkin Institute of Geology, Komi Scientific Center, Ural Branch of the Russian Academy of Sciences

Email: pystin.48@mail.ru
Russian Federation, Syktyvkar

V. L. Khubanov

N.L. Dobretsov Geological Institute, Siberian Branch of the Russian Academy of Sciences

Email: pystin.48@mail.ru
Russian Federation, Ulan-Ude

K. S. Popvasev

N.P. Yushkin Institute of Geology, Komi Scientific Center, Ural Branch of the Russian Academy of Sciences

Email: pystin.48@mail.ru
Russian Federation, Syktyvkar

E. V. Kushmanova

N.P. Yushkin Institute of Geology, Komi Scientific Center, Ural Branch of the Russian Academy of Sciences

Email: pystin.48@mail.ru
Russian Federation, Syktyvkar

I. L. Potapov

N.P. Yushkin Institute of Geology, Komi Scientific Center, Ural Branch of the Russian Academy of Sciences

Email: pystin.48@mail.ru
Russian Federation, Syktyvkar

References

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2. Fig. 1. A fragment of a schematic geological map of the northwestern wing of the Harbin-Marunkeu anticlinorium (compiled using materials [1, 2]). Symbols: 1 – Upper Rifeian Nemuryugan formation; 2-3 –Upper Rifeian Nyarovian series: 2 – the Upper Riphean Miniseishor formation, 3 – the Upper Fey Upper Karbay formation; 4 – the Lower Proterozoic Khanmeikhoi formation of the Harbin metamorphic complex; 5 – the Lower Proterozoic Marunke metamorphic complex; 6 – granites, granite-gneisses; 7 – metadiorites; 8 – metagabbro, metagabbrodolerites; 9 – apogarzburgite serpentinites; 10 – contacts of geological bodies: a – stratigraphic and intrusive, b – stratigraphic and structural inconsistencies; 11 – tectonic disturbances: a – steep–falling disjunctiva, b – thrusts, sharyages; 12 - elements of occurrence of planar structures. The circle with the number shows the sampling sites: 1 – No. 4-28, 2 – MB‑9, 3 – MB‑119. The rectangle on the inset is the outline of the cx fragment

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3. Fig. 2. Histograms and probability density curves of U–Pb ages of detrital zircons from terrigenous Upper- Precambrian deposits of the Polar Urals. a – according to [7]; b – our data.

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4. Fig. 3. Arens-Weatherill diagram with concordia and U–Pb age (intersection method) of zircon from the metariolite of the Nemuryugan formation (sample MB‑119, N = 46).

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