DOI: 10.1016/j.quascirev.2017.04.033
Scopus记录号: 2-s2.0-85019569010
论文题名: Wisconsinan and early Holocene glacial dynamics of Cumberland Peninsula, Baffin Island, Arctic Canada
作者: Margreth A. ; Gosse J.C. ; Dyke A.S.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2017
卷: 168 起始页码: 79
结束页码: 100
语种: 英语
英文关键词: Alpine glaciers
; Climate dynamics
; Cockburn
; Cosmogenic isotopes
; Glacial geomorphology
; Laurentide ice sheet
; Middle Wisconsinan
; Penny ice cap
; Polythermal
; Radiocarbon
; Younger Dryas
Scopus关键词: Dynamics
; Glacial geology
; Glaciers
; Isotopes
; Snow
; Alpine glacier
; Climate dynamics
; Cockburn
; Cosmogenic isotopes
; Glacial geomorphology
; Ice-caps
; Laurentide ice sheets
; Middle Wisconsinan
; Polythermal
; Radiocarbon
; Younger Dryas
; Ice
英文摘要: Three glacier systems—an ice sheet with a large marine-based ice stream, an ice cap, and an alpine glacier complex—coalesced on Cumberland Peninsula during the Late Wisconsinan. We combine high-resolution mapping of glacial deposits with new cosmogenic nuclide and radiocarbon age determinations to constrain the history and dynamics of each system. During the Middle Wisconsinan (Oxygen Isotope Stage 3, OIS-3) the Cumberland Sound Ice Stream of the Laurentide Ice Sheet retreated well back into Cumberland Sound and the alpine ice retreated at least to fiord-head positions, a more significant recession than previously documented. The advance to maximal OIS-2 ice positions beyond the mouth of Cumberland Sound and beyond most stretches of coastline remains undated. Partial preservation of an over-ridden OIS-3 glaciomarine delta in a fiord-side position suggests that even fiord ice was weakly erosive in places. Moraines formed during deglaciation represent stillstands and re-advances during three major cold events: H-1 (14.6 ka), Younger Dryas (12.9–11.7 ka), and Cockburn (9.5 ka). Distinctly different responses of the three glacial systems are evident, with the alpine system responding most sensitively to Bølling-Allerød warming whereas the larger systems retreated mainly during Pre-Boreal warming. While the larger ice masses were mainly influenced by internal dynamics, the smaller alpine glacier system responded sensitively to local climate effects. Asymmetrical recession of the alpine glacier complex indicates topoclimatic control on deglaciation and perhaps migration of the accumulation area toward moisture source. © 2017 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59197
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, Nova Scotia, Canada
Recommended Citation:
Margreth A.,Gosse J.C.,Dyke A.S.. Wisconsinan and early Holocene glacial dynamics of Cumberland Peninsula, Baffin Island, Arctic Canada[J]. Quaternary Science Reviews,2017-01-01,168