DOI: 10.1016/j.quascirev.2015.10.018
Scopus记录号: 2-s2.0-84945914828
论文题名: Late Wisconsinan ice sheet flow across northern and central Vermont, USA
作者: Wright S.F.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2015
卷: 129 起始页码: 216
结束页码: 228
语种: 英语
英文关键词: Glacial striations
; Ice streaming
; New England
; Vermont
Scopus关键词: Glacial geology
; Glaciers
; Ice control
; Landforms
; Sea ice
; Champlain Valley
; Glacial striations
; Ice-sheet flow
; Last Glacial Maximum
; New England
; South-to-North
; Topographic control
; Vermont
; Ice
; azimuth
; ice flow
; ice sheet
; ice stream
; Last Glacial Maximum
; transgression
; Atlantic Ocean
; Gulf of Maine
; United States
英文摘要: A compilation of over 2000 glacial striation azimuths across northern and central Vermont, northeastern USA, provides the basis for interpreting a sequence of ice flow directions across this area. The oldest striations indicate widespread ice flow to the southeast, obliquely across the mountains. Similarly oriented striations between northern Vermont and the ice sheet's terminus in the Gulf of Maine suggest that a broad area of southeast ice flow existed at the Last Glacial Maximum. Younger striations with more southerly azimuths on both the mountain ridgelines and within adjacent valleys indicate that ice sheet flow trajectories in most areas rotated from southeast to south, parallel to the North-South alignment of the mountains, as the ice sheet thinned. This transition in ice flow direction was time transgressive from south to north with the Green Mountains eventually separating a thick south-flowing lobe of ice in the Champlain Valley from a much thinner lobe of south-flowing ice east of the mountains. While this transition was taking place yet ice was still thick enough to flow across the mountains, ice flow along a narrow 65 km long section of the Green Mountains shifted to the southwest such that ice was flowing into the Champlain Valley. The most likely process driving this change was a limited period of fast ice flow in the Champlain Valley, a short-lived ice streaming event, that drew down the ice surface in the valley. The advancing ice front during this period of fast ice flow may be responsible for the Luzerne Readvance south of Glens Falls, New York. Valley-parallel striations across the area indicate strong topographic control on ice flow as the ice sheet thinned. © 2015 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59761
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Geology, University of Vermont, Burlington, VT, United States
Recommended Citation:
Wright S.F.. Late Wisconsinan ice sheet flow across northern and central Vermont, USA[J]. Quaternary Science Reviews,2015-01-01,129