DOI: 10.1016/j.quascirev.2016.06.014
Scopus记录号: 2-s2.0-84978493378
论文题名: Sedimentary and structural evolution of a Pleistocene small-scale push moraine in eastern Poland: New insight into paleoenvironmental conditions at the margin of an advancing ice lobe
作者: Włodarski W. ; Godlewska A.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2016
卷: 146 起始页码: 300
结束页码: 321
语种: 英语
英文关键词: Detachment folds
; Fold-accommodation faults
; Ice-front sustained advance
; Pleistocene
; Progradational fan
; Push moraine
Scopus关键词: Deformation
; Deposition
; Deposition rates
; Deposits
; Hydraulic conductivity
; Lithology
; Sedimentology
; Strain rate
; Stratigraphy
; Detachment folds
; Environmental variables
; Fold accommodation faults
; Glaciotectonic deformation
; Mechanical stratigraphy
; Pleistocene
; Push moraine
; Spatio-temporal scale
; Ice
; detachment fold
; folding
; glaciotectonics
; hydraulic conductivity
; ice sheet
; paleoenvironment
; Pleistocene
; progradation
; push moraine
; rheology
; sediment budget
; structural analysis
; Poland [Central Europe]
英文摘要: Recent studies of push moraines have focused on the interplay between the dynamics of ice margins and the environmental variables of the foreland into which they advance. These studies showed that the spatial distribution, geometry and style of the glaciotectonic deformation of push moraines are controlled by ice-induced stresses, the strain rate, the rheology of the deposits and hydraulic conductivity. In this work, we provide new insight into this interplay at a small spatio-temporal scale, specifically, the ancient glacial system of the Liwiec ice lobe within the younger Saalian ice sheet in eastern Poland. The paleoenvironmental variables that are analysed here refer to the dynamics of the hydrological processes that affected the patterns and sediment deposition rate on the terminoglacial fan and the resulting mechanical stratigraphy and hydraulic conductivity of the foreland. We document the progradational sequence of the fan deposits that developed as a result of the ice lobe thickening and the steepening of its stationary front. The sedimentary features of the fan, the lithology of its basement and the hydraulic conductivity of the foreland strongly influenced the geometry and kinematics of fold growth during the advance of the ice lobe. The predominance of flexural slip and the development of fractures, including fold-accommodation faults, were interpreted to be an effect of buckle folding due to horizontal shortening induced by ice advance. The partial overriding of the push moraine by the ice lobe and, thus, the submarginal conditions for deformation were inferred from the significant hinge migration and internal deformation of the strata under undrained conditions in one of the folds. The synfolding deposition pattern of the fan growth strata allowed us to suggest that the push moraine was probably formed by a sustained advance rather than surge. © 2016 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59527
Appears in Collections: 过去全球变化的重建
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作者单位: Institute of Geology, Adam Mickiewicz University, Maków Polnych 16, Poznań, Poland; Department of Geoecology and Palaeogeography, Faculty of Earth Sciences and Spatial Management, Maria Curie-Skłodowska University in Lublin, Krasnicka 2 c,d/108A, Lublin, Poland
Recommended Citation:
Włodarski W.,Godlewska A.. Sedimentary and structural evolution of a Pleistocene small-scale push moraine in eastern Poland: New insight into paleoenvironmental conditions at the margin of an advancing ice lobe[J]. Quaternary Science Reviews,2016-01-01,146