Яндекс.Метрика

Б.Б. Кочнев, Д.В. Семенова, М.К. Данукалова, В.Б. Хубанов, В.В. Марусин, А.К. Худолей

Сериальное издание: Geodynamics and Tectonophysics = Геодинамика и тектонофизика
Том: 16 , Год издания: 2025

Аннотация

Herein we report the results of LA-ICP-MS dating of detrital zircons from eight stratigraphic levels of the Proterozoic section of the Igarka uplift (northwestern Siberian Platform). The age spectra include the Meso- and Neoarchean (3100-2600 Ma), Paleoproterozoic (2100-1700 Ma) and Neoproterozoic (1000-600 Ma) ages. However, the age distribution drastically varies among the samples. The Neoproterozoic zircons, associated with the hypothetic orogenic belt at the platform periphery, dominate in the lowstand system-tract continental and marginal marine strata (Gubinskaya, basal Chernaya Rechka, and Izluchina formations). In contrast, the zircons in the Riphean and Vendian marine strata (Bezymyanny, Ludy, Korablik, and Sukharikha formations) mostly originate from erosion of the crystalline basement of the Siberian Platform. The concordant mafic bodies in the Upper Riphean (Criogenian) Gubinskaya formation contain the concordant cluster of zircons of 8354 Ma. It contradicts with the maximum deposition age of 71610 Ma of the host strata, hence the zircons in the mafic bodies supposedly comprise xenocrysts.
индекс в базе ИАЦ: 010374