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Late Paleozoic supradetachment basin configuration in the southwestern Barents Sea—Intrabasement seismic facies of the Fingerdjupet Subbasin
Basin Research ( IF 3.2 ) Pub Date : 2021-10-30 , DOI: 10.1111/bre.12631
Julie L. S. Gresseth 1 , Alvar Braathen 2 , Christopher S. Serck 2 , Jan Inge Faleide 2, 3 , Per Terje Osmundsen 1, 4
Affiliation  

Late to post-Caledonian, Devonian extension remains unresolved in the SW Barents Sea, despite considerable knowledge from onshore Norway, East Greenland and Svalbard. We analyse intrabasement seismic facies in high-resolution 3D and reprocessed 2D data to investigate evidence for Caledonian deformation and post-Caledonian detachment faulting in the central SW Barents Sea. These results are compared to published potential field models and analogue field studies from onshore Svalbard and Bjørnøya, substantiating that structures inherited from post-orogenic extension influenced the Late Paleozoic and Mesozoic basin evolution. The Late Paleozoic Fingerdjupet Subbasin is underlain by a NNE-striking, ESE-dipping extensional detachment fault that records a minimum eastwards displacement of 22 km. The detachment fault and associated shear zone(s) separate post-orogenic metamorphic core complexes from the syn-tectonic deposits of a presumed Devonian supradetachment basin. Spatial variability in isostatically induced doming likely governed Devonian basin configurations. Pronounced footwall corrugations and faults splaying from the detachment indicate eastward extensional transport. This ultimately led to two interacting but subsequent, east-stepping detachments. Local reactivation of the detachment systems controlled the extent of Carboniferous carbonate and evaporite basins in the Bjarmeland Platform area. Further, the Mesozoic Terningen Fault Complex and Randi Fault Set testify to how the inherited Devonian structural template continued to control spatial localisation and extent of rift structures during subsequent periods of extensional faulting in the Fingerdjupet Subbasin.

中文翻译:

巴伦支海西南部晚古生代超拆离盆地构造——Fingerdjupet次盆地基底内地震相

尽管来自挪威陆上、东格陵兰和斯瓦尔巴群岛的大量知识,但晚至后加里多世,泥盆纪延伸在 SW 巴伦支海仍未解决。我们以高分辨率 3D 和重新处理的 2D 数据分析基底内地震相,以研究巴伦支海中部加里东期变形和加里东期后拆离断层的证据。将这些结果与已发表的潜在场模型和陆上 Svalbard 和 Bjørnøya 的模拟场研究进行了比较,证实了从造山后伸展继承的结构影响了晚古生代和中生代盆地演化。晚古生代 Fingerdjupet 次盆地的下方是一条 NNE 走向、ESE 倾角的伸展拆离断层,记录了最小向东位移 22 公里。滑脱断层和相关的剪切带将造山后变质岩心杂岩与假定的泥盆纪超滑脱盆地的同构造沉积物分开。等静压引起的拱顶的空间变异性可能支配着泥盆纪盆地的构造。明显的下盘波纹和从分离中张开的断层表明向东伸展运输。这最终导致了两个相互作用但随后的东进支队。分离系统的局部重新激活控制了 Bjarmeland 平台地区石炭纪碳酸盐和蒸发岩盆地的范围。进一步,
更新日期:2021-10-30
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