DOI: 10.1016/j.quascirev.2018.05.034
Scopus记录号: 2-s2.0-85047904902
论文题名: Architecture and sedimentary processes on the mid-Norwegian continental slope: A 2.7 Myr record from extensive seismic evidence
作者: Montelli A. ; Dowdeswell J.A. ; Ottesen D. ; Johansen S.E.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2018
卷: 192 起始页码: 185
结束页码: 207
语种: 英语
英文关键词: Continental slope
; Debris flows
; Fennoscandian ice sheet
; Glacial geomorphology
; Ice streams
; Marine geology
; Palaeo-glaciology
; Seismic stratigraphy
; Slope processes
; Turbidity currents
Scopus关键词: Debris
; Flow of water
; Geomorphology
; Glacial geology
; Glaciers
; Hydraulics
; Ice
; Landforms
; Ocean currents
; Sediment transport
; Sedimentology
; Seismology
; Stratigraphy
; Submarine geology
; Turbidity
; Continental slope
; Debris flows
; Glacial geomorphology
; Ice sheet
; Ice streams
; Palaeo-glaciology
; Seismic stratigraphy
; Slope process
; Turbidity current
; Process control
英文摘要: Quaternary architectural evolution and sedimentary processes on the mid-Norwegian continental slope are investigated using margin-wide three- and two-dimensional seismic datasets. Of ∼100,000 km3 sediments delivered to the mid-Norwegian shelf and slope over the Quaternary, ∼75,000 km3 comprise the slope succession. The structural high of the Vøring Plateau, characterised by initially low (∼1–2°) slope gradients and reduced accommodation space, exerted a strong control over the long-term architectural evolution of the margin. Slope sediment fluxes were higher on the Vøring Plateau area, increasing up to ∼32 km3 ka−1 during the middle Pleistocene, when fast-flowing ice streams advanced to the palaeo-shelf edge. Resulted in a more rapid slope progradation on the Vøring Plateau, these rates of sediment delivery are high compared to the maximum of ∼7 km3 ka−1 in the adjacent sectors of the slope, characterised by steeper slope (∼3–5°), more available accommodation space and smaller or no palaeo-ice streams on the adjacent shelves. In addition to the broad-scale architectural evolution, identification of more than 300 buried slope landforms provides an unprecedented level of detailed, process-based palaeoenvironmental reconstruction. Channels dominate the Early Pleistocene record (∼2.7–0.8 Ma), during which glacimarine sedimentation on the slope was influenced by dense bottom-water flow and turbidity currents. Morphologic signature of glacigenic debris-flows appear within the Middle-Late Pleistocene (∼0.8–0 Ma) succession. Their abundance increases towards Late Pleistocene, marking a decreasing role for channelized turbidity currents and dense water flows. This broad-scale palaeo-environmental shift coincides with the intensification of Northern Hemispheric glaciations, highlighting first-order climate control on the sedimentary processes in high-latitude continental slopes. • The 2.7 Myr evolution of the mid-Norwegian continental slope has been examined using extensive 3D and 2D seismic data.• Of more than 100,000 km3 of total Quaternary sediment volume ∼75,000 km3 comprises the slope succession.• Slope sediment flux increased from ∼15 km3/ka in the Early Quaternary to up to ∼33 km3/ka in the Middle-Late Quaternary.• Pre-existing physiography exerted strong control on the Quaternary architectural evolution of the continental slope.• Detailed buried slope landforms show a transition from glacimarine sedimentation to a debris-flow dominated environment. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112148
Appears in Collections: 气候减缓与适应
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作者单位: Scott Polar Research Institute, University of Cambridge, Cambridge, CB2 1ER, United Kingdom; Geological Survey of Norway, Trondheim, N-7491, Norway; Department of Geoscience and Petroleum, Norwegian University of Science and Technology, Trondheim, N-7031, Norway
Recommended Citation:
Montelli A.,Dowdeswell J.A.,Ottesen D.,et al. Architecture and sedimentary processes on the mid-Norwegian continental slope: A 2.7 Myr record from extensive seismic evidence[J]. Quaternary Science Reviews,2018-01-01,192