DOI: 10.1016/j.quascirev.2012.11.009
Scopus记录号: 2-s2.0-84871882853
论文题名: A latest Pliocene age for the earliest and most extensive Cordilleran Ice Sheet in northwestern Canada
作者: Hidy A.J. ; Gosse J.C. ; Froese D.G. ; Bond J.D. ; Rood D.H.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2013
卷: 61 起始页码: 77
结束页码: 84
语种: 英语
英文关键词: Burial dating
; Cordilleran Ice Sheet
; Early glaciation
; Klondike Goldfields
; Plio-Pleistocene
; Yukon River
Scopus关键词: Burial dating
; Cordilleran ice sheet
; Early glaciation
; Klondike Goldfields
; Plio-pleistocene
; Debris
; Glacial geology
; Gold
; Gravel
; Glaciers
; burial (geology)
; Cordilleran Ice Sheet
; cosmogenic radionuclide
; glaciation
; glaciofluvial deposit
; gravel
; halocline
; ice-rafted debris
; Laurentide Ice Sheet
; magnetostratigraphy
; obliquity
; Pleistocene
; Pliocene
; Canada
; Klondike
; Yukon Territory
英文摘要: The Klondike gravel is a widespread glaciofluvial gravel marking the earliest and most extensive Cordilleran Ice Sheet (CIS) in NW North America. New terrestrial cosmogenic nuclide (TCN) burial ages indicate this gravel was emplaced 2.64+0.20/-0.18 Ma (1σ). Coupled with previously interpreted paleomagnetic stratigraphy, this numerical age constrains the timing of the earliest CIS to the late Gauss Chron and provides a minimum age for the Upper White Channel gravel, a significant placer gold source in the Yukon. This implies the first CIS glacial maximum pre-dates the maximum extent of the Laurentide Ice Sheet, indicating that during the initial stages of northern hemisphere glaciation, the most extensive glaciers were present in the relatively cold and high elevation northern Cordillera. Our results verify the CIS as a likely source of persistent coeval ice-rafted debris in the northern Pacific, and suggest that the first CIS formed as a response to the establishment of the northern Pacific halocline and emergence of the 41 ka obliquity cycle during the Plio-Pliocene transition. © 2012 Elsevier Ltd.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60729
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Earth Sciences, Dalhousie University, Halifax, NS B3H 4J1, Canada; Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, AB T6G 2E3, Canada; Yukon Geological Survey, P.O. Box 2703, Whitehorse, Yukon Y1A 2C6, Canada; Scottish Universities Environmental Research Centre (SUERC), East Kilbride G75 0QF, United Kingdom; Earth Research Institute, University of California, Santa Barbara, CA 93106, United States
Recommended Citation:
Hidy A.J.,Gosse J.C.,Froese D.G.,et al. A latest Pliocene age for the earliest and most extensive Cordilleran Ice Sheet in northwestern Canada[J]. Quaternary Science Reviews,2013-01-01,61