The Precambrian in the Sub-Polar Urals : the chronostratigraphic aspect.

• Main Authors: Александр Михайлович Пыстин, Юлия Ивановна Пыстина, Alexander Pystin, Yulia Pystina
• Format: Article
• Language: English
• Published: Karelian Research Centre of the Russian Academy of Sciences 2019-02-01
• Series: Transactions of the Karelian Research Centre of the Russian Academy of Sciences
• Subjects: приполярный урал, нижний и верхний протерозой, комплекс, свита, изотопный возраст.
• Online Access: http://journals.krc.karelia.ru/index.php/precambrian/article/view/904

New geochronological data on the Lower and Upper Proterozoic complexes of the Sub-Polar Urals are presented, where the outcropping Precambrian section in the Lyapin anticlinorium<br />is the stratotype for the entire Timan-Northern Urals region. The author’s version of the stratigraphic scheme for Pre-Palaeozoic formations in the study area is proposed. It is shown that unlike the Bashkir anticlinorium in the Southern Urals, with a complete<br />section of the Upper Proterozoic, our region has no Lower and Middle Riphean deposits. Taking into account the new data on the isotope age of zircons from the Precambrian<br />formations from the various parts of the Timan-Northern Urals region, it is argued that that during the entire Early Riphean and most or all of the Middle Riphean the northeastern margin of the Baltic was outside the zone of marine sedimentation. That is, chronologically, the Timan continental margin was laid down near the boundary of the Middle and Upper Riphean.