DOI: 10.1016/j.quascirev.2017.03.027
Scopus记录号: 2-s2.0-85017180607
论文题名: Structural architecture and glacitectonic evolution of the Mud Buttes cupola hill complex, southern Alberta, Canada
作者: Phillips E. ; Evans D.J.A. ; Atkinson N. ; Kendall A.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2017
卷: 164 起始页码: 110
结束页码: 139
语种: 英语
英文关键词: Forward propagating thrust-stack model
; Large-scale glacitectonism
; Laurentide ice sheet
; Mud Buttes
Scopus关键词: Cupolas
; Deformation
; Domes
; Glaciers
; Landforms
; Tectonics
; Alberta , Canada
; Deformation structure
; Large-scale glacitectonism
; Laurentide ice sheets
; Mud Buttes
; Quaternary sediments
; Stack model
; Structural architecture
; Ice
; accretion
; bedrock
; Cretaceous
; glaciotectonics
; ice margin
; ice retreat
; Laurentide Ice Sheet
; moraine
; mudstone
; numerical model
; paleosol
; Quaternary
; sandstone
; siltstone
; tectonic evolution
; Alberta
; Belly River
; Canada
; Laurentian Mountains
; Quebec [Canada]
英文摘要: This paper presents the results of a detailed multidisciplinary study of the deformed bedrock and overlying Quaternary sediments exposed at the Mud Buttes in southern Alberta, Canada. This large, arcuate cupola hill is composed of intensely folded and thrust sandstones, siltstones and mudstones of the Cretaceous Belly River Formation. Glacitectonism responsible for the development of this internally complex landform occurred at the margin of the newly defined Prospect Valley lobe of the Laurentide Ice Sheet. Analysis of the deformation structures reveals that construction of this landform occurred in response to at least two phases of south-directed ice sheet advance separated by a period of retreat. The first phase led to the formation of a forward propagating imbricate thrust stack leading to polyphase deformation of the Belly River Formation. D1 thrusting led to the detachment of thrust-bound slices of bedrock which were accreted to the base of the developing imbricate stack. This process resulted in the structurally higher and older thrust-slices being progressively “back-rotated” (tilted), accompanied by D2 thrusting and folding. Further thrusting during D3 was restricted to the core of the Mud Buttes as the deforming sequence accommodated further compression imposed by the advancing ice. Minor oscillations of the ice margin led to localised brittle-ductile shearing (D4) of the bedrock immediately adjacent to the ice contact part of the thrust stack. The second phase of ice advance led to the accretion of a relatively simple thrust and folded sequence seen the northern side of Mud Buttes. The resulting composite thrust moraine was subsequently overridden by ice advancing from the NNW to form a dome-like cupola-hill. This readvance of the Prospect Valley lobe led to the formation of a thin carapace of Quaternary sediments mantling the Mud Buttes which include glacitectonite, till and an organic-rich clay-silt (?palaeosol). © 2017 Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59240
Appears in Collections: 过去全球变化的重建
There are no files associated with this item.
作者单位: British Geological Survey, The Lyell Centre, Research Avenue South, Edinburgh, United Kingdom; Department of Geography, University of Durham, South Road, Durham, United Kingdom; Alberta Geological Survey, Twin Atria Building Suite 402, 4999 - 98 Avenue, Edmonton, Alberta, Canada; Department of Geoscience, University of Calgary, ES118, 2500 University Drive Northwest, Calgary, Alberta, Canada
Recommended Citation:
Phillips E.,Evans D.J.A.,Atkinson N.,et al. Structural architecture and glacitectonic evolution of the Mud Buttes cupola hill complex, southern Alberta, Canada[J]. Quaternary Science Reviews,2017-01-01,164