DOI: 10.1016/j.quascirev.2013.01.021
Scopus记录号: 2-s2.0-84873738021
论文题名: Seismic stratigraphy, sedimentary architecture and palaeo-glaciology of the Mackenzie Trough: Evidence for two Quaternary ice advances and limited fan development on the western Canadian Beaufort Sea margin
作者: Batchelor C.L. ; Dowdeswell J.A. ; Pietras J.T.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2013
卷: 65 起始页码: 73
结束页码: 87
语种: 英语
英文关键词: Grounding-zone wedge
; Ice stream
; Laurentide Ice Sheet
; Mackenzie Trough
; Seismic reflection
; Trough-mouth fan
Scopus关键词: Grounding-zone wedges
; Ice streams
; Laurentide ice sheets
; Mackenzie Trough
; Seismic reflections
; Architecture
; Computer integrated manufacturing
; Glacial geology
; Glaciers
; Sedimentology
; Seismic waves
; Seismology
; Stratigraphy
; Ice
; continental slope
; fan delta
; glacial history
; glaciation
; grounding line
; ice stream
; Laurentide Ice Sheet
; moraine
; reconstruction
; sediment chemistry
; seismic reflection
; seismic stratigraphy
; shelf break
; subglacial deposit
; till
; trough
; Wisconsinan
; Arctic Ocean
; Beaufort Sea
; Mackenzie Trough
英文摘要: A comprehensive grid of high-resolution 2-D seismic reflection data from the western Canadian Beaufort Sea margin is used to reconstruct past ice-stream dynamics within the Mackenzie Trough. Eight seismic facies and five sequences, divided into two megasequences, are identified from the Mackenzie Trough stratigraphy. Evidence for two Quaternary ice advances to the shelf break is provided by two sequences of acoustically chaotic to semi-transparent facies, interpreted as subglacial till. Buried landforms interpreted as lateral moraines and a grounding-zone wedge record the positions of still-stands or re-advances in the ice margin. The continental slope beyond the trough is characterised by canyons separated by inter-canyon ridges and thin glacigenic debris flows. Correlation with the onshore record suggests that the older of the two ice advances, which excavated the Mackenzie Trough, probably occurred during the Illinoian or Early Wisconsinan glaciations. The younger ice-stream advance is interpreted to have occurred during the last, Late Wisconsinan glaciation. The onset of cross-shelf glaciation on the western Canadian Beaufort Sea margin is inferred to have been initiated significantly later than on the eastern Beaufort Sea and eastern Canadian Arctic margins, which have a longer history of ice advance and were less peripheral to the ice-sheet centre. The architecture of the slope beyond the Mackenzie Trough reflects this comparatively short history of ice advance and lacks the progradational architecture and major glacial-sedimentary depocentre or trough-mouth fan that is characteristic of slopes seaward of cross-shelf troughs on formerly-glaciated margins. © 2013 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60685
Appears in Collections: 过去全球变化的重建
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作者单位: Scott Polar Research Institute, University of Cambridge, Lensfield Road, Cambridge CB2 1ER, United Kingdom; BP America Production Company, 580 Westlake Park Boulevard, Houston, TX 77079, United States
Recommended Citation:
Batchelor C.L.,Dowdeswell J.A.,Pietras J.T.. Seismic stratigraphy, sedimentary architecture and palaeo-glaciology of the Mackenzie Trough: Evidence for two Quaternary ice advances and limited fan development on the western Canadian Beaufort Sea margin[J]. Quaternary Science Reviews,2013-01-01,65