Zircon Archean of the Transuralian megazone

Краснобаев, А. А.; Пучков, В. Н.; Puzhakov, B. A.; Busharina, S. V.; Сергеева, Н. Д.

doi:10.1134/s1028334x1512020x

Cited by 3 publications

(1 citation statement)

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“…On the eastern margin of the Volga-Ural part of the Baltic, occurrences of Mesoproterozoic plume magmatism, associated with active rifting,are distinguished in the Bashkir anticlinorium in the Southern Urals in the form of Navysh alkaline-basaltic volcanics [22]. Based on the results of local U-Pb dating of zircons, the age of these rocks is estimated at 1752 ± 11 Ma [16,17]. Within the Timan-Northern Ural region we didnot determine endogenous events of the «Navysh» time.…”

Section: Comparison Of the Received Data With The Results Of Zircon Dating From The Upper Precambrian Terrigenous Deposits Of Timan And Tmentioning

confidence: 99%

Geochronology of Precambrian formations of the north of the Urals

Pystin¹,

Pystina²

2021

Vestnik Geonauk

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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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Section: Comparison Of the Received Data With The Results Of Zircon Dating From The Upper Precambrian Terrigenous Deposits Of Timan And Tmentioning

confidence: 99%