Open AccessU-Pb (SHRIMP) age of zircons from granitoid pebbles of Kukkarauk conglomerates of Vendian asha series in the Alatau anticlinorium (Southern Urals)
Author(s) -
А. А. Краснобаев,
В. Н. Пучков,
Н. Д. Сергеева,
С. В. Бушарина
Publication year - 2019
Publication title -
doklady akademii nauk. rossijskaâ akademiâ nauk
Language(s) - English
Resource type - Journals
ISSN - 0869-5652
DOI - 10.31857/s0869-56524865598-602
Subject(s) - geology , provenance , structural geology , paleontology , massif , shrimp , sedimentology , series (stratigraphy) , geochemistry , fishery , biology
The absence of reliable radiometric data in Vendian deposits of the Uralian and other regions resulted in uncertainty of the ideas of the age of the lower boundary of Vendian. According to the decision of the Interdepartment Stratigraphic Committee, it is located at 600 ±10 Ma. Analysing zircons of granitoid pebbles from Kukkarauk Formation of the standard sections of Vendian in the Alatau anticlinorium, the authors obtained a concordant SHRIMP date - 713.6 ± 6.1 Ma; practically, it is up to now the only reliable date that can be used as a reference for the rocks in the provenance area of the Vendian basin in the Southern Urals which witness for a Vendian erosion of granites which are alike the granites of the Mazara and Barangulovo massifs, situated in the northern part of the Uraltau zone of the Southern Urals, to the east of the area of Vendian sedimentation.