Geochronology of Precambrian formations of the north of the Urals

Geochronology of Precambrian formations of the north of the Urals

Автор: A.M. Pystin, Yu.I. Pystina

Журнал: Вестник геонаук @vestnik-geo

Рубрика: Научные статьи

Статья в выпуске: 3 (315), 2021 года.

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The paper summarizes results of work on the geochronological confirmation of the age of metamorphic structures occurring at the base of the Precambrian of the north of the Urals and the age of overlying Upper Precambrian basal sediments. It is shown that the occurrences of early stages of metamorphism of rocks of metamorphic (polymetamorphic) complexes date back to about 2.1 Ga. Their substrate is unambiguously related to the Lower Precambrian. We determined that Mesoproterozoic strata are absent Upper Precambrian sections of the north of the Urals, in contrast to more southern regions of the Urals. The basal strata in the Lyapin and Kharbey-Marunkeu anticlinoria, according to the data obtained, are dated to the Middle Neoproterozoic (cryogenian). The established fact of the absence of deposits of a huge age interval (Mesoproterozoic — at least 600 Ma) in the north of the Urals can be explained by a high standing of the territory of the northeast (in modern coordinates) of the Baltic craton, a fragment of which at that time was the Timan-Northern Ural lithospheric segment, and the location in the interiors of the Columbia (Nuna) supercontinent.

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North of the Urals, Lower and Upper Precambrian, basal deposits, geochronology.

Короткий адрес: https://sciup.org/149129473

IDR: 149129473   |   DOI: 10.19110/geov.2021.3.1

Список литературы Geochronology of Precambrian formations of the north of the Urals

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