U-Th-Pb (LA-ICP-MS) dating of zircons from sandstones of the Basu Formation of the Vendian Asha Series of the Southern Urals and the age of rocks in the distributive province.

Research subject. Zircon of sandstones of the Basu Formation, Asha Series, Vendian, in the reference section along the Kukrauk stream (Southern Urals). Aim. To determine the age of rocks in the provenance based on U-Th-Pb (LA-ICP-MS) dating of zircon clastics. Materials and methods. In terms of color, detrital zircon grains were divided into three groups. Pale pink grains predominate (about 50%), and pink and colorless grains are present in equal proportions (about 20–30%). Zircon is mainly represented by rounded grains and single grains of a prismatic shape. According to the cathodoluminescence data, most grains retain traces of zonation. Results. The U-Th-Pb concordant ages dates of 166 detrital zircon grains are predominantly in the time intervals of 996–1029, 1079–1110, 1152–1191, 1200–1234, 1250–1324, 1331–1370, 1416–1438, 1447–1557, 1573–1666, 1756–1806, 1824–1874, 1889–1979, 1987–2015, 2022–2074, and 2661–2729 Ma. Individual grains have concordant ages of 579, 776, 2120, 2142, 2148, 2190, 2763, 2874, 2804, 2816, 2889, 2957, 3014, and 3203 Ma. Conclusions. The group of pink grains is dominated by a population of zircon of the Early Karelian and Archaean age, in colorless grains – Early Riphean, and in pale pink grains – Early and Middle Riphean. Among the grains of detrital zircon from the sandstones of the Basu Formation, there are zircons from local Ural sources (776, 1350–1800,   2000–3200 Ma). For clastic zircon with ages of 996–1320 Ma, the sources of demolition among the local feeding provinces have not been identified; however, they are known within the Sveko-Norwegian area in the north-west of the East-European Platform. This allows us to consider the igneous rocks of the Grenville (950–1220 million years) Sveko-Norwegian orogen as sources of zircon clusters over this time interval. The source of zircons with a dating of 579 Ma, closeto the age (573–577 Ma) of zircons from tuff layers in the Basu Formation itself, could be ash material from the explosive activity of volcanoes

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