DOI: 10.1016/j.quascirev.2018.03.018
Scopus记录号: 2-s2.0-85043978663
论文题名: Sediment failures within the Peach Slide (Barra Fan, NE Atlantic Ocean) and relation to the history of the British-Irish Ice Sheet
作者: Owen M.J. ; Maslin M.A. ; Day S.J. ; Long D.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2018
卷: 187 起始页码: 1
结束页码: 30
语种: 英语
英文关键词: Barra fan
; British-Irish Ice Sheet
; Glaciation
; North atlantic
; Peach slide
; Quaternary
; Sedimentology-marine cores
; Submarine mass movement
Scopus关键词: Catchments
; Consolidation
; Fruits
; Glacial geology
; Glaciers
; Sediments
; Seismology
; Stratigraphy
; Submarines
; Underwater acoustics
; British-Irish ice sheet
; Glaciation
; Marine cores
; Mass movement
; North Atlantic
; Peach slide
; Quaternary
; Ice
; continental margin
; contourite
; core analysis
; deglaciation
; depocenter
; deposition
; geomorphological mapping
; glaciation
; ice sheet
; marine sediment
; mass movement
; Quaternary
; sediment analysis
; sedimentation
; sedimentology
; slope failure
; underwater environment
; Younger Dryas
; Atlantic Ocean
; Atlantic Ocean (North)
; Barra Fan
; Prunus persica
英文摘要: The Peach Slide is the largest known submarine mass movement on the British continental margin and is situated on the northern flank of the glacigenic Barra Fan. The Barra Fan is located on the northwest British continental margin and is subject to cyclonic ocean circulation, with distinct differences between the circulation during stadial and inter-stadial periods. The fan has experienced growth since continental uplift during the mid-Pliocene, with the majority of sediments deposited during the Pleistocene when the fan was a major depocentre for the British-Irish Ice Sheet (BIIS). Surface and shallow sub-surface morphology of the fan has been mapped using newly digitised archival paper pinger and deep towed boomer sub-bottom profile records, side scan sonar and multibeam echosounder data. This process has allowed the interpretation and mapping of a number of different seismic facies, including: contourites, hemipelagites and debrites. Development of a radiocarbon based age model for the seismic stratigraphy constrains the occurrence of two periods of slope failure: the first at circa 21 ka cal BP, shortly after the BIIS's maximum advance during the deglaciation of the Hebrides Ice Stream; and the second between 12 and 11 ka cal BP at the termination of the Younger Dryas stadial. Comparison with other mass movement events, which have similar geological and oceanographic settings, suggests that important roles are played by contouritic and glacigenic sedimentation, deposited in inter-stadial and stadial periods respectively when different thermohaline regimes and sediment sources dominate. The effect of this switch in sedimentation is to rapidly deposit thick, low permeability, glacigenic layers above contourite and hemipelagite units. This process potentially produced excess pore pressure in the fan sediments and would have increased the likelihood of sediment failure via reduced shear strength and potential liquefaction. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112227
Appears in Collections: 气候减缓与适应
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作者单位: Department of Geography, University College London, Gower Street, London, WC1E 6BT, United Kingdom; Department of Earth Sciences, University College London, Gower Street, London, WC1E 6BT, United Kingdom; British Geological Survey, Murchison House, West Mains Road, Edinburgh, EH9 3LA, United Kingdom; Geological Survey of Denmark and Greenland, C. F. Møllers Allé 8, Building 1110, Aarhus C, DK-8000, Denmark
Recommended Citation:
Owen M.J.,Maslin M.A.,Day S.J.,et al. Sediment failures within the Peach Slide (Barra Fan, NE Atlantic Ocean) and relation to the history of the British-Irish Ice Sheet[J]. Quaternary Science Reviews,2018-01-01,187