globalchange  > 影响、适应和脆弱性
DOI: 10.1016/j.epsl.2018.07.005
Scopus记录号: 2-s2.0-85050270797
论文题名:
The Agadir Slide offshore NW Africa: Morphology, emplacement dynamics, and potential contribution to the Moroccan Turbidite System
作者: Li W.; Krastel S.; Alves T.M.; Urlaub M.; Mehringer L.; Schürer A.; Feldens P.; Gross F.; Stevenson C.J.; Wynn R.B.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 498
起始页码: 436
结束页码: 449
语种: 英语
英文关键词: Agadir submarine slide ; Moroccan Turbidite System ; multibeam bathymetry ; Northwest Africa ; turbidity current
Scopus关键词: Bathymetry ; Ocean currents ; Sediment transport ; Stratigraphy ; Submarine geology ; Submarines ; Turbidity ; Multibeam bathymetry ; Northwest Africa ; Submarine slides ; Turbidite systems ; Turbidity current ; Morphology ; bathymetry ; emplacement ; multibeam sonar ; stratigraphic correlation ; submarine landslide ; turbidite ; turbidity current ; Africa
英文摘要: A newly identified large-scale submarine landslide on the NW African margin (Agadir Slide) is investigated in terms of its morphology, internal architecture, timing, and emplacement processes using high-resolution multibeam bathymetry data, 2D seismic profiles, and gravity cores. The Agadir Slide is located south of the Agadir Canyon at a water depth ranging from 500 m to 3,500 m, showing an estimated affected area of approximately 5,500 km2. The analysis of the Agadir Slide's complex morphology reveals the presence of two headwall areas and two slide fairways (the Western and Central slide fairways). Volume calculations indicate that ∼340 km3 of sediment were accumulated downslope along the slide fairways (∼270 km3) and inside the Agadir Canyon (∼70 km3). Stratigraphic correlations based on five gravity cores indicate an emplacement age of 142±1 ka for the Agadir Slide. However, its emplacement dynamics suggest that the slide was developed in two distinct, successive stages. The presence of two weak layers (glide planes) is a major preconditioning factor for the occurrence of slope instability in the study area, and local seismicity related to fault activity and halokinesis likely triggered the Agadir Slide. Importantly, the Agadir Slide neither disintegrated into sediment blocks nor was transformed into turbidity currents. The emplacement timing of the Agadir Slide does not correlate with any turbidites cored downslope across the Moroccan Turbidite System. © 2018 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109732
Appears in Collections:影响、适应和脆弱性
气候变化事实与影响

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作者单位: CAS Key Laboratory of Ocean and Marginal Sea Geology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, 510301, China; Christian-Albrechts-Universität zu Kiel, Institute of Geosciences, Otto-Hahn-Platz 1, Kiel, 24118, Germany; 3D Seismic Lab. School of Earth and Ocean Sciences, Cardiff University, Main Building, Park Place, Cardiff, CF10 3AT, United Kingdom; GEOMAR Helmholtz Centre for Ocean Research Kiel, Wischhofstr. 1-3, Kiel, 24148, Germany; Faculty of Geosciences and MARUM, Center for Marine Environmental Sciences, University of Bremen, Klagenfurter Straße, Bremen, 28359, Germany; Leibniz Institute for Baltic Sea Research, Warnemünde, Rostock, 18119, Germany; School of Earth, Ocean and Ecological Sciences, University of Liverpool, Liverpool, L69 3GP, United Kingdom; National Oceanography Centre, European Way, Southampton, Hampshire, SO14 3ZH, United Kingdom

Recommended Citation:
Li W.,Krastel S.,Alves T.M.,et al. The Agadir Slide offshore NW Africa: Morphology, emplacement dynamics, and potential contribution to the Moroccan Turbidite System[J]. Earth and Planetary Science Letters,2018-01-01,498
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