globalchange  > 过去全球变化的重建
DOI: 10.1016/j.quascirev.2017.04.017
Scopus记录号: 2-s2.0-85019034687
论文题名:
Controls on dryland mountain landscape development along the NW Saharan desert margin: Insights from Quaternary river terrace sequences (Dadès River, south-central High Atlas, Morocco)
作者: Stokes M.; Mather A.E.; Belfoul M.; Faik F.; Bouzid S.; Geach M.R.; Cunha P.P.; Boulton S.J.; Thiel C.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2017
卷: 166
起始页码: 363
结束页码: 379
语种: 英语
英文关键词: Africa ; Climate dynamics ; Fluvial geomorphology ; Optical methods ; Paleogeography ; Pleistocene
Scopus关键词: Floors ; Limestone ; Rivers ; Stratigraphy ; Africa ; Climate dynamics ; Fluvial geomorphology ; Optical methods ; Paleogeography ; Pleistocene ; Landforms
英文摘要: This study documents river terraces from upstream reaches of the Dadès River, a major fluvial system draining the south-central High Atlas Mountains. Terraces occur as straths with bedrock bases positioned at 10 m altitudinal intervals up to 40 m (T1-T5) above the valley floor, becoming less common between 50 and 140 m. The rock strength, stratigraphy and structure of the mountain belt influences terrace distribution. Terraces are absent in river gorges of structurally thickened limestone; whilst well-developed, laterally continuous terraces (T1-T4) form along wide valleys occupying syncline structures dominated by weaker interbedded limestone-mudstone. Terrace staircases develop in confined canyons associated with weaker lithologies and influence from structural dip and stratigraphic configuration. Terraces comprise a bedrock erosion surface overlain by fluvial conglomerates, rare overbank sands and colluvium. This sequence with some OSL/IRSL age control, suggests terrace formation over a 100 ka climate cycle with valley floor aggradation during full glacials and incision during glacial-interglacial transitions. This integrates with other archives (e.g. lakes, glaciers, dunes), appearing typical of landscape development along the NW Saharan margin south of the High Atlas, and similar to patterns in the western-southern Mediterranean. The 100 ka climate cycle relationship suggests that the terrace sequence documents Late-Middle Pleistocene landscape development. Consistent altitudinal spacing of terraces and their distribution throughout the orogen suggests sustained base-level lowering linked to uplift-exhumation of the High Atlas. Low incision rates (<0.2 mm a−1) and general absence of terrace deformation suggests dominance of isostatically driven base-level lowering with relief generation being Early Pleistocene or older. © 2017 Elsevier Ltd
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59222
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作者单位: School of Geography, Earth and Environmental Sciences, Plymouth University, Drake Circus, Plymouth, Devon, United Kingdom; Structural Geology and Thematic Mapping Laboratory, Earth Sciences Department, Faculty of Science, Ibn Zohr University, PO Box 8106, Hay Dakhla, Agadir, Morocco; ATKINS, Woodcote Grove, Ashley Road, Epsom, United Kingdom; Marine and Environmental Sciences Centre, Department of Earth Sciences, Universidade de Coimbra, Coimbra, Portugal; Leibniz-Institut für Angewandte Geophysik, Stilleweg 2, Hannover, Germany; Nordic Laboratory for Luminescence Dating, Aarhus University, and Centre for Nuclear Technologies, Technical University of Denmark (DTU), Risø Campus, Denmark

Recommended Citation:
Stokes M.,Mather A.E.,Belfoul M.,et al. Controls on dryland mountain landscape development along the NW Saharan desert margin: Insights from Quaternary river terrace sequences (Dadès River, south-central High Atlas, Morocco)[J]. Quaternary Science Reviews,2017-01-01,166
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