Abstract
The purpose of the work was to study the tectonic structure of the Zilair synclinorium of the Western slope of the southern Urals, which is important both from the general scientific point of view and for the needs of oil and gas prospecting of the territory. The main method of research was a detailed study of the stratigraphy of key sites with the search for conodonts in siliceous rocks. We also used data from seismic profiling of the territory. Result of work. The Zilair synclinorium of the southern Urals is an asymmetrically different facies structure; its Western and Eastern wings are composed of deposits belonging to different facies zones – the shelf (neritic) in the West and the continental slope and rise (bathyal) in the East. In the axial zone of the synclinorium, among the Famennian graywacke deposits of the Zilair series, several sites composed of cherts are known. It was believed, that the cherts are of Silurian age and are the klippes of a very large overthrust belonging to the ophiolite association. According to occurences of conodonts, we have established that all these cherts have Devonian, mainly Frasnian age. They are not klippes of an overthrust, but the central parts of the anticlinal folds, complicated by steep thrusts. According to our data, the real overthrust with a great horizontal amplitude is Pokrovsky, where two facial zones come into an abrupt contact without any transition between them.
Highlights
The purpose of the work was to study the tectonic structure of the Zilair synclinorium of the Western slope of the southern Urals, which is important both from the general scientific point of view and for the needs of oil and gas prospecting of the territory
The Zilair synclinorium of the southern Urals is an asymmetrically different facies structure; its Western and Eastern wings are composed of deposits belonging to different facies zones – the shelf in the West and the continental slope and rise in the East
That the cherts are of Silurian age and are the klippes of a very large overthrust belonging to the ophiolite association
Summary
Геолого-структурная карта северной и средней части Зилаирского синклинория Урала (по [15] с изменениями и дополнениями): 1 – надвиги (шарьяжи), 2 – шельфовый палеозой Бельского типа (известняки, кварцевые песчаники, О–D3 fm), 3 – докембрийский фундамент, 4, 5 – зилаирский комплекс, полимиктовые песчаники, алевролиты, глинистые сланцы (D3 fm–C1t): 4 – на шельфовых отложениях (Мурадымовская пластина–западный борт Зилаирского синклинория), 5 – на батиальных отложениях (Покровская пластина–восточный борт Зилаирского синклинория), 6 – батиальный палеозой Лемвинского типа Cherts in the upper section (O – D3 fm); 7 – Maksyutov high pressure metamorphic complex) 8 – oceanic and island-arc complexes (O – D3); pr. The numbers in circles are the locations of conodonts in flints of the Suvanyak complex, described data in the paper
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
