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DOI: 10.1016/j.gloplacha.2015.10.007
论文题名:
Bedrock structures controlling the spatial occurrence and geometry of 1.8Ga younger glacifluvial deposits - Example from First Salpausselkä, southern Finland
作者: Skyttä P.; Kinnunen J.; Palmu J.-P.; Korkka-Niemi K.
刊名: Global and Planetary Change
ISSN: 0921-8181
出版年: 2015
卷: 135
起始页码: 66
结束页码: 82
语种: 英语
英文关键词: 3D-modelling ; Digital elevation models (DEMs) ; Glacifluvial deposits ; Groundwater ; Shear zones ; Structural analysis
Scopus关键词: Aquifers ; Deformation ; Geologic models ; Glacial geology ; Groundwater ; Groundwater resources ; Hydrogeology ; Ice control ; Stratigraphy ; Structural analysis ; Underground structures ; Water supply ; 3D modelling ; Digital elevation model ; Hydrogeological properties ; Quaternary sediments ; Shear zone ; Spatial correlations ; Structural interpretation ; Tectonic deformations ; Deposits ; Equisetales
英文摘要: The glacifluvial deposits within formerly glaciated areas of southern Finland comprise the predominance of well-sorted subglacial and ice marginal sediments. The deposits are less than 100 m thick and form significant aquifers utilized by the respective areas. The spatial correlation of subglacial deposits with bedrock structures, particularly the deformation zones, has been long recognized, but most often not systematically investigated. The purpose of this study was to understand how specific bedrock structures control the position and processes of formation of glacifluvial deposits, using the First Salpausselkä area of southern Finland as a model area. We apply a means of structural analysis to compile structural interpretations (form lines and 3D-surfaces) of the bedrock and correlate the results with the patterns of the glacifluvial deposits and the topography of the underlying bedrock surface. Two major E-W striking shear zones defining abrupt breaks at the bedrock surface along with secondary SW-NE striking splays, originating from the horsetail-like termination of the Somero shear zone, control the deposition of eskers and ice marginal deposits. Based on correlations between the bedrock topography, glacial erosion and sedimentation, we infer that laterally extensive shear zones may have indirectly affected the glacial dynamics within the areas of areal scour more than previously considered. Recognized deformation zones are important for modelling the internal stratigraphy of glacifluvial deposits, their hydrogeological properties and for mapping fresh water supplies within the Nordic countries and other glaciated areas which have undergone substantial tectonic deformation. The development of 3D geologic models is essential for understanding regional-scale correlations between Quaternary sediments and bedrock structures. © 2015 Elsevier B.V.
URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84954196839&doi=10.1016%2fj.gloplacha.2015.10.007&partnerID=40&md5=5ce6689589c7737009788dce92864346
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/11462
Appears in Collections:全球变化的国际研究计划
气候变化与战略

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作者单位: Geology Section, Department of Geography and Geology, University of Turku, Finland

Recommended Citation:
Skyttä P.,Kinnunen J.,Palmu J.-P.,et al. Bedrock structures controlling the spatial occurrence and geometry of 1.8Ga younger glacifluvial deposits - Example from First Salpausselkä, southern Finland[J]. Global and Planetary Change,2015-01-01,135.
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