气候变化领域集成服务门户(CCPortal): Crustal structure and erosion of the Lofoten/Vesterålen shelf, northern Norwegian margin

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DOI	10.1016/j.tecto.2020.228318
	Crustal structure and erosion of the Lofoten/Vesterålen shelf, northern Norwegian margin
	Breivik A.J.; Faleide J.I.; Mjelde R.; Flueh E.R.; Murai Y.
发表日期	2020
ISSN	00401951
卷号	776
英文摘要	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/Vesterålen 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/Vesterålen 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 Vesterålen. © 2020 Elsevier B.V.
关键词	Crustal structure Erosion Gravity Norwegian shelf Ocean bottom seismometers
英文关键词	Gravitation; Sedimentology; Seismographs; Seismology; Structural geology; Velocity; Well logging; Continental break-up; Continental shelves; Crustal structure; Crustal thickness; Norwegian continental shelves; Norwegian shelf; Ocean bottom seismometer; Sedimentary basin; Erosion; continental shelf; crustal structure; erosion; gravity field; ocean bottom seismometer; seismic data; seismic survey; Lofoten; Nordland; Norway; Vesteralen
语种	英语
来源期刊	Tectonophysics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/207722
作者单位	Centre for Earth Evolution and Dynamics (CEED), Department of Geosciences, University of Oslo, Norway; Department of Earth Science, University of Bergen, Norway; GEOMAR Helmholtz Centre for Ocean Research Kiel, Germany; Institute of Seismology and Volcanology, Faculty of Science, Hokkaido University, Sapporo, Japan
推荐引用方式 GB/T 7714	Breivik A.J.,Faleide J.I.,Mjelde R.,et al. Crustal structure and erosion of the Lofoten/Vesterålen shelf, northern Norwegian margin[J],2020,776.
APA	Breivik A.J.,Faleide J.I.,Mjelde R.,Flueh E.R.,&Murai Y..(2020).Crustal structure and erosion of the Lofoten/Vesterålen shelf, northern Norwegian margin.Tectonophysics,776.
MLA	Breivik A.J.,et al."Crustal structure and erosion of the Lofoten/Vesterålen shelf, northern Norwegian margin".Tectonophysics 776(2020).