DOI: 10.1016/j.quascirev.2013.07.015
Scopus记录号: 2-s2.0-84900449326
论文题名: Changes in current patterns in the Fram Strait at the Pliocene/Pleistocene boundary
作者: Gebhardt A.C. ; Geissler W.H. ; Matthiessen J. ; Jokat W.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2014
卷: 92 起始页码: 179
结束页码: 189
语种: 英语
英文关键词: Arctic Ocean
; Contourites
; Drift sediments
; Fram Strait
; Pliocene/Pleistocene
; Seismic reflection
; Yermak Plateau
Scopus关键词: Glaciers
; Sea ice
; Seismic waves
; Stratigraphy
; Arctic ocean
; Contourites
; Drift sediments
; Fram strait
; Pliocene
; Seismic reflections
; Yermak plateaux
; Sediments
; bottom current
; coastal current
; contourite
; depositional environment
; drift (glacial deposit)
; erosion
; fluvial deposit
; glaciation
; ice sheet
; Pliocene-Pleistocene boundary
; sea ice
; sediment wave
; sedimentation rate
; seismic reflection
; stratigraphy
; wave modeling
; Arctic
; Arctic Ocean
; Atlantic Ocean
; Barents Sea
; Fram Strait
; Greenland
; Scandinavia
; Svalbard
; Svalbard and Jan Mayen
; West Spitsbergen Current
; Yermak Plateau
英文摘要: Seismic reflection profiles from the northwestern and central part of the Fram Strait show thick packages of drift type sediments mainly along the western Yermak Plateau flank, but also in the central, flat part of the Fram Strait. North of 80.5°N, a large-scale field of sediment waves along the Yermak Plateau rise separates a western, lower from an eastern, upper drift body. These drift bodies were deposited by bottom currents, most likely the northbound Yermak Branch of the West Spitsbergen Current, but we cannot rule out that the western drift body may also have been influenced by southbound bottom currents. A stratigraphic boundary is clearly visible within the drift bodies and even more pronounced within the sediment waves, separating a lower package of waves migrating upslope at low angle (~5°) from an upper package with significantly increased wave crest migration (~16.5°). This stratigraphic boundary could be tracked along the seismic network and corresponds to the lithostratigraphic boundary between units IA and IB at ODP Leg 151, Site 911 that was dated to 2.7Ma. The increase in wave-crest migration angle indicates a shift towards higher sedimentation rates at 2.7Ma, which corresponds to the intensification of the Northern Hemisphere glaciation with a major expansion of the Greenland, Scandinavian, northern Barents Sea and North American ice sheets. The subaerially exposed Barents shelf and the expansion of the northern Barents Sea ice sheet (as well as Svalbard) are likely sources for enhanced erosion and enhanced fluvial input along the pathway of the West Spitsbergen Current, resulting in higher sedimentation rates in the Fram Strait. © 2013 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60279
Appears in Collections: 过去全球变化的重建
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作者单位: Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Am Alten Hafen 26, 27568 Bremerhaven, Germany
Recommended Citation:
Gebhardt A.C.,Geissler W.H.,Matthiessen J.,et al. Changes in current patterns in the Fram Strait at the Pliocene/Pleistocene boundary[J]. Quaternary Science Reviews,2014-01-01,92