DOI: 10.1016/j.quascirev.2015.06.005
Scopus记录号: 2-s2.0-84934951087
论文题名: Terrace styles and timing of terrace formation in the Weser and Leine valleys, northern Germany: Response of a fluvial system to climate change and glaciation
作者: Winsemann J. ; Lang J. ; Roskosch J. ; Polom U. ; Böhner U. ; Brandes C. ; Glotzbach C. ; Frechen M.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2015
卷: 123 起始页码: 31
结束页码: 57
语种: 英语
英文关键词: Base-level
; Climate
; Fluvial terrace architecture
; Glacio-isostatic adjustment
; Luminescence dating
; Shear wave seismics
Scopus关键词: Catchments
; Climate change
; Climatology
; Deposits
; Glacial geology
; Glaciers
; Isotopes
; Luminescence
; Petroleum geology
; Sea level
; Shear flow
; Shear waves
; Stratigraphy
; Tectonics
; Base-level
; Climate
; Fluvial terraces
; Glacio-isostatic adjustment
; Luminescence dating
; Rivers
; aggradation
; avulsion
; braided river
; chronostratigraphy
; climate change
; depositional sequence
; drainage network
; fluvial landform
; glacial deposit
; glaciation
; glacier advance
; glacier retreat
; glacioisostasy
; Holocene
; ice sheet
; incised valley
; late glacial
; luminescence dating
; marine isotope stage
; meander
; Miocene
; outcrop
; Paleolithic
; reconstruction
; river terrace
; S-wave
; sea level change
; Weichselian
; Germany
; Leine Valley
; Lower Saxony
; Weser River
英文摘要: In glaciated continental basins accommodation space is not only controlled by tectonics and sea-level but also by the position of ice-sheets, which may act as a regional base-level for fluvial systems. Although the Pleistocene terrace record of major river systems in northwestern Europe has been investigated by many authors, relatively little attention has been paid to base-level changes related to glacier advance-retreat cycles and how these regional changes in base-level interacted with river catchment processes. This study provides a synthesis of the stratigraphic architecture of Middle Pleistocene to Holocene fluvial terraces in the upper Weser and middle Leine valley in northern Germany and links it to glaciation, climate and base-level change. The depositional architecture of the fluvial terrace deposits has been reconstructed from outcrops and high-resolution shear wave seismic profiles. The chronology is based on luminescence ages, 230Th/U ages, 14C ages and Middle Palaeolithic archaeological assemblages.The drainage system of the study area developed during the Early Miocene. During the Pleistocene up to 170m of fluvial incision took place. A major change in terrace style from strath terraces to cut-and-fill terraces occurred during the early Middle Pleistocene before Marine Isotope Stage MIS 12, which may correlate with climate deterioration and the onset of glaciation in northern central Europe. During this time a stable buffer zone was established within which channels avulsed and cut and filled freely without leaving these vertical confines. Climate was the dominant driver for river incision and aggradation, whereas the terrace style was controlled by base-level changes during ice-sheet growth and decay. A major effect of glacio-isostatic processes was the post-Elsterian re-direction of the River Weser and River Leine.The Middle Pleistocene fluvial terraces are vertically stacked, indicating a high aggradation to degradation ratio, corresponding with a regional base-level rise during glacier advance. At the beginning of the Late Pleistocene the terrace style changed from a vertical to a lateral stacking pattern, which is attributed to a decrease in accommodation space during glacier retreat. The formation of laterally attached terraces persisted into the Holocene.Major incision phases took place during MIS 5e, 5d, 5c, and probably early MIS 4, early MIS 3 and MIS 2 (Lateglacial). During MIS 5e and the Lateglacial the braided river systems changed into meandering rivers, indicated by preserved organic-rich flood-plain and point bar deposits. The Late Pleistocene braided river systems (MIS 5c to MIS 3) are characterized by a high sinuosity, which may be a direct effect of an increased downstream gradient after deglaciation when the channel lengthened and the river adjusted to the increased gradient by increasing sinuosity. These Middle Pleniglacial fluvial deposits are unconformably overlain by Lateglacial to Holocene meandering river deposits, which form laterally attached terraces, recording millennial-scale channel shifts. The lack of Late Pleniglacial deposits might be related to Late Weichselian forebulge formation. © 2015 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59859
Appears in Collections: 过去全球变化的重建
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作者单位: Institut für Geologie, Leibniz Universität Hannover, Callinstraße 30, Hannover, Germany; Leibniz Institute for Applied Geophysics (LIAG), Stilleweg 2, Hannover, Germany; Niedersächsisches Landesamt für Denkmalpflege, Scharnhorststraße 1, Hannover, Germany
Recommended Citation:
Winsemann J.,Lang J.,Roskosch J.,et al. Terrace styles and timing of terrace formation in the Weser and Leine valleys, northern Germany: Response of a fluvial system to climate change and glaciation[J]. Quaternary Science Reviews,2015-01-01,123