Geological Structure and Historical Development of Pre-Jurrasic Basement of West Siberia Oil- and Gas-Bearing Megabasin Karabash Zone — Oak Academic Publishing
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Geological Structure and Historical Development of Pre-Jurrasic Basement of West Siberia Oil- and Gas-Bearing Megabasin Karabash Zone
Institute of Geology and Geochemistry, Urals Branch of Russian Academy of Sciences, Yekaterinburg, Russia
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Institute of Geology and Geochemistry, Urals Branch of Russian Academy of Sciences, Yekaterinburg, Russia
,
Institute of Geology and Geochemistry, Urals Branch of Russian Academy of Sciences, Yekaterinburg, Russia
,
Institute of Geology and Geochemistry, Urals Branch of Russian Academy of Sciences, Yekaterinburg, Russia
1 Institute of Geology and Geochemistry, Urals Branch of Russian Academy of Sciences, Yekaterinburg, Russia
2 Institute of Geology and Geochemistry, Urals Branch of Russian Academy of Sciences, Yekaterinburg, Russia
3 Institute of Geology and Geochemistry, Urals Branch of Russian Academy of Sciences, Yekaterinburg, Russia
4 Institute of Geology and Geochemistry, Urals Branch of Russian Academy of Sciences, Yekaterinburg, Russia
An additional comprehensive study of the west Siberia Karabash zone basement has been conducted. Core samples from more than 300 wells that opened the rocks of the basement were analyzed by different methods. A new map of the pre-Jurassic basement of Karabash zone of the west part of the Khanty-Mansi Autonomous Okrug (KhMAO) has been made. For the first time for the West Siberia megabasin U-Pb dating was made for samples from Shaim-Kuznetsovsk meganticlinorium and late to middle Devonian ages were obtained. The Devonian ages was obtained for metamorphic complexes of the region and, in general, for the basement of West Siberia. The complexes considered as Precambrian before that. The obtained results enable significantly to clarify more exact history of pre-Jurassic rock forming for the basement of the west part of West Siberia craton and its structure in the limits of Karabash zone. Thus, obtained data testify that in pre-Jurassic basement of the west part of the West Siberia (Karabash zone), filling grabens basalt effusion began during Permian time (probably at the end of early Permian) at sublatitudinal compression, that is, at collision, possibly immediately after or subsynchronously with the origin of the granite. On the edge of Permian and Triassic (or in early Triassic), sublatitudinal compression changed into stretching, and submeridional grabens came to existence and basalt effusion came up to the maximum.
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