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首页> 外文期刊>Norsk geologisk tidsskrift >Palaeozoic and early Mesozoic evolution of the East Barents and Kara seas sedimentary basins
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Palaeozoic and early Mesozoic evolution of the East Barents and Kara seas sedimentary basins

机译：东巴伦支和卡拉海沉积盆地的古生代和中生代早期演化

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Detailed studies of the Palaeozoic and Mesozoic evolution of the East Barents and Kara sedimentary basins reveal complex tectono-stratigraphic and depositional histories. The present geodynamic and paleogeographic reconstructions are based on results from regional geological investigations, seismic surveys, stratigraphic studies of offshore and onshore sections and cores, as well as isotopic and geochemical data. The accumulated knowledge has made it possible to establish a tectonic framework for the Barents-Kara Region, and to compile a set of paleogeographic maps that illustrate the tectono-stratigraphic and depositional history for selected Palaeozoic-Early Mesozoic time intervals. The geological history of the region can be separated into the following main phases: 1) Ordovician to Early Devonian passive continental margin, 2) Early Devonian (Lochkovian to Eifelian) shelf destruction, 3) Mid to Late Devonian (Givetian to Early Frasnian) pericontinental rifting, 4) Late Devonian to Early Carboniferous development of marginal basins, 5) Carboniferous to Permian ocean closure and collision, 6) Late Permian to Triassic Uralian orogeny, followed by 7) formation of epicontinental basins from the Early Jurassic and onwards. The East Barents Basin is interpreted as the fore-deep caused by the Uralian collision and orogeny. The formation of hydrocarbon deposits is attributed to the main convergent phase of geological evolution of the Barents-Kara region.
机译：对东巴伦支和卡拉沉积盆地的古生代和中生代演化的详细研究揭示了复杂的构造地层和沉积历史。当前的地球动力学和古地理重建是基于区域地质调查，地震调查，近海和陆上剖面和岩心的地层学研究以及同位素和地球化学数据的结果。积累的知识使建立Barents-Kara地区的构造框架成为可能，并编制了一套古地理图，显示了部分古生代-早中生代时间间隔的构造-地层和沉积历史。该地区的地质历史可以分为以下主要阶段：1）奥陶纪至泥盆纪早期的被动大陆边缘; 2）泥盆纪早期（Lochkovian至Eifelian）陆架破坏; 3）泥盆纪中期至晚期（Givetian到Frasnian早期）裂谷; 4）边缘盆地的泥盆纪晚期至石炭纪早期发育; 5）石炭纪至二叠纪海洋封闭和碰撞; 6）二叠纪晚期至三叠纪乌拉尔造山运动;其次，7）从侏罗纪早期及以后的陆上陆盆形成。东巴伦支盆地被解释为由乌拉尔碰撞和造山作用引起的最深处。碳氢化合物沉积物的形成归因于Barents-Kara地区地质演化的主要收敛阶段。

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