Abstract The Norwegian continental shelf has been through several rift phases since the Caledonian orogeny. Early Cretaceous rifting created the largest sedimentary basins, and Early Cenozoic continental breakup between East Greenland and Europe affected the continental shelf to various degrees. The Lofoten/Vesteralen shelf is located off Northern Norway, bordering the epicontinental Barents Sea to the northeast, and the deep-water Lofoten Basin to the west. An ocean bottom seismometer/hydrophone (OBS) survey was conducted over the shelf and margin areas in 2003 to constrain crustal structure and margin development. This study presents Profile 8-03, located between the islands of Lofoten/Vesteralen and the shelf edge. The wide-angle seismic data were modeled using forward/inverse raytracing to build a crustal velocity-depth transect. Gravity modeling was used to resolve an ambiguity in seismic Moho identification in the southwestern part. Results show a crustal thickness of ~31 km, significantly thicker than what a vintage land station based study suggested. Profile 8-03 and other OBS profiles to the southwest show high sedimentary velocities at or near the seafloor, increasing rapidly with depth. Sedimentary velocities were compared to the velocity-depth function derived from an OBS profile at the Barents Sea margin, tied to a coincident well log, where there is little erosion. Results from this profile and the crossing Profile 6-03 (Breivik et al. 2017) indicate three major erosion episodes; Late Triassic-Early Jurassic, tentatively mid-Cretaceous, Late Cretaceous–early Cenozoic, and a minor late glacial erosion episode off Vesteralen.

中文翻译：

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挪威北部边缘 Lofoten/Vesterålen 陆架的地壳结构和侵蚀

摘要 自加里东造山运动以来，挪威大陆架经历了几个裂谷阶段。早白垩世裂谷创造了最大的沉积盆地，东格陵兰岛和欧洲之间的早新生代大陆分裂对大陆架产生了不同程度的影响。罗弗敦/韦斯特拉伦大陆架位于挪威北部附近，东北与巴伦支海大陆接壤，西部与深水罗弗敦盆地接壤。2003 年在大陆架和边缘地区进行了海底地震仪/水听器 (OBS) 调查，以限制地壳结构和边缘发育。本研究介绍了 Profile 8-03，位于 Lofoten/Vesteralen 岛和货架边缘之间。广角地震数据使用正向/反向射线追踪建模，以建立地壳速度-深度横断面。重力模型用于解决西南地区地震莫霍面识别中的模糊性。结果显示地壳厚度约为 31 公里，明显厚于基于老式陆地站的研究建议的厚度。剖面 8-03 和其他西南方向的 OBS 剖面显示海底或附近的高沉积速度，随着深度的增加而迅速增加。将沉积速度与从巴伦支海边缘的 OBS 剖面得出的速度-深度函数进行比较，该剖面与几乎没有侵蚀的重合测井相关。该剖面和交叉剖面 6-03（Breivik 等人，2017 年）的结果表明发生了三个主要的侵蚀事件；晚三叠世-早侏罗世，暂定的中白垩世，晚白垩世-早新生代，以及 Vesteralen 附近的轻微晚期冰川侵蚀事件。