DOI: 10.1016/j.tecto.2020.228318
论文题名: Crustal structure and erosion of the Lofoten/Vesterålen shelf, northern Norwegian margin
作者: Breivik A.J. ; Faleide J.I. ; Mjelde R. ; Flueh E.R. ; Murai Y.
刊名: Tectonophysics
ISSN: 00401951
出版年: 2020
卷: 776 语种: 英语
中文关键词: 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
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. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/170556
Appears in Collections: 气候变化与战略
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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
Recommended Citation:
Breivik A.J.,Faleide J.I.,Mjelde R.,et al. Crustal structure and erosion of the Lofoten/Vesterålen shelf, northern Norwegian margin[J]. Tectonophysics,2020-01-01,776