DOI: 10.1016/j.quascirev.2014.10.023
Scopus记录号: 2-s2.0-84910629774
论文题名: Gravitational spreading of mountain ridges coeval with Late Weichselian deglaciation: Impact on glacial landscapes in Tröllaskagi, northern Iceland
作者: Coquin J. ; Mercier D. ; Bourgeois O. ; Cossart E. ; Decaulne A.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2015
卷: 107 起始页码: 197
结束页码: 213
语种: 英语
英文关键词: Deglaciation
; DSGSD
; Landslides
; LiDAR
; Paraglacial
Scopus关键词: Deformation
; Erosion
; Glacial geology
; Landslides
; Optical radar
; Deglaciations
; DSGSD
; Geomorphic evidence
; Geomorphological mapping
; Glacial landscapes
; Paraglacial
; Rock slope failure
; Topographic slope
; Landforms
; deglaciation
; geomorphology
; glacial environment
; lidar
; mountain environment
; paleoclimate
; slope
; trough
; Weichselian
; Iceland
; Trollaskagi
英文摘要: During the Late Weichselian deglaciation, the coastal mountains of northern central Iceland have experienced significant paraglacial readjustment processes in the form of conspicuous rock slope failures and deep-seated gravitational slope deformation (DSGSD). Local topographic slopes and ridges were deeply reshaped by these large scale paraglacial processes. Located on the eastern side of Skagafjördur, one of the largest fjords of northern Iceland, the Óslandshlídarfjöll and Hnjúkar ridges (65°49N, 19°14W) exhibit geomorphic evidence of spectacular DSGDS. Several series of DSGSD-induced landforms such as crestal graben and troughs initiated by ridge-top splitting were investigated over a 30-km2 area. On the basis of geomorphological mapping we recognized: (i) a ridge-top splitting event mainly controlled by glacial debuttressing induced by a minimal 300m lowering of the glacier surface in the Deildardalur valley; (ii) a rapid Late Weichselian deglaciation of the Deildardalur valley spanning a few thousands of years (ice-free stage probably reached around 14,000yearscal.BP); (iii) ridge-top splitting having an influence on large-scale glacial patterns by guiding and facilitating glacial erosion along ridge-top grabens, resulting in accelerated trough widening. Based on these interpretations, we propose an evolutionary sequence of both the kinematic stages of the DSGSD and the Late Weichselian deglaciation at the valley scale. This work provides new insights into (i) the patterns of the Late Weichselian deglaciation in the Skagafjördur area, especially in tributary valleys of the fjord, (ii) the timing of large-scale paraglacial ridge-top deformations in relation to the post-LGM deglaciation and (iii) the influence of paraglacial DSGSD features on large-scale glacial erosional patterns. © 2014 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60071
Appears in Collections: 过去全球变化的重建
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作者单位: Université de Nantes, CNRS Laboratoire LETG-Nantes-Géolittomer UMR 6554, France; Institut Universitaire de France, France; Université de Nantes, CNRS, UMR 6112, Laboratoire de Planétologie et Géodynamique de Nantes, France; Université Paris 1-Panthéon-Sorbonne, Laboratoire PRODIG, UMR 8586, France; CNRS Laboratoire LETG-Nantes-Géolittomer, UMR 6554, France; Observatoire des Sciences de l'Univers Nantes Atlantique (OSUNA, CNRS UMS 3281), France; CNRS - GDR 3062 Mutations polaires, Besançon, France
Recommended Citation:
Coquin J.,Mercier D.,Bourgeois O.,et al. Gravitational spreading of mountain ridges coeval with Late Weichselian deglaciation: Impact on glacial landscapes in Tröllaskagi, northern Iceland[J]. Quaternary Science Reviews,2015-01-01,107