New data on geology of the Shatak Complex (western slope of the Southern Urals) |
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| Authors: | S G Kovalev I V Vysotskii |
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| Institution: | (1) Institute of Geology, Ufa Research Center, Russian Academy of Sciences, ul. Karla Marksa 16/2, Ufa, 450000, Bashkir Republic, Russia;(2) Bashgeoltsentr RB State Unitary Enterprise, ul. Lenina 86, Ufa, 450000, Bashkir Republic, Russia |
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| Abstract: | The comprehensive study of sections of the Shatak Complex has revealed that conglomerates at the base of Middle Riphean rocks are not basal but intraformational rocks. Previously described angular unconformities between shales of the Sukhin Subformation (Yusha Formation, R1) and conglomerates of the Kuz”elga Subformation (Mashak Formation, R2) are related to late tectonic movements. Magmatic rocks developed at the base of the Middle Riphean section are represented by sheet intrusions formed in the course of emplacement of a fluid-saturated magmatic melt into partially or completely lithified terrigenous rocks at the graben formation stage during the origination of synkinematic faults that served as magma conduits. It is inferred that distribution of provenances of clastic materials and sedimentation basins in the Burzyanian and Yurmatian should be scrutinized in the study region, because the normal regressive sequence of rocks from the uppermost Yusha Formation to the lowermost Mashak Formation, which was established in the Shatak Ridge, eliminates a clear boundary distinguished between them at present. The idea about an older age of the Mashak conglomerates is substantiated. |
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