Geologicheskii Vestnik

The оrogenic complex of Timanides is represented in the Southern Urals by deposits of Basu, Kukkarauk and Zigan Formations of the Vendian Asha Series, which belong to molasse. The composition and structure of the Asha molasse are described in the standard Vendian sections of the western limb of the Bashkirian meganticlinorium. For the first time, the Vendian provenance area was characterized by a reference SHRIMP date (713.6±6.1 Ma) after zircon from a granite pebble of Kukkarauk Formation conglomerates. This date indicates that in the Vendian time in the provenance area were eroded rocks that were close in the age and composition to the granites of the Mazara massif (710–740 Ma) and Barangulovo gabbro-granite complex (725±5 Ma), situated in the northern part of the Uraltau zone in the Southern Urals, to the East of the sampling place of the granite pebble. Therefore, both areas of sedimentation and provenance are suggested. The formation of the Vendian sediments at the expense of the complexes of the youngest Riphean straton (Arshinian) shows that at the boundary of the Riphean and Vendian in the east of the Bashkirian meganticlinorium there was no long break of sedimentation and therefore a fairly complete geological information was preserved concerning the evolutionary development of the region. At the same time, in the western limb of the Bashkirian meganticlinorium the Asha series of the terminal Riphean falls out of the section completely, and here the manifestations and scale of the Pre-Asha erosion need additional study

Vendian, Timanide, Asha Series, Formation, zircons, U-Pb dating, Southern Urals

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