Shape and amount of the Quaternary uplift of the western Rhenish shield and the Ardennes (western Europe)

• Autor: Demoulin, A. ; Hallot, E.
• Materias: Earth sciences ; Earth sciences & physical geography ; Intraplate tectonics ; physical geography ; Physical, chemical, mathematical & earth Sciences ; Physique, chimie, mathématiques & sciences de la terre ; Rhenish shield Quaternary uplift ; River incision ; Sciences de la terre & géographie physique ; Tectonic uplift ; Western Europe
• Es parte de: Tectonophysics, 2009-09, Vol.474 (3), p.696-708
• Notas: ObjectType-Article-2
  SourceType-Scholarly Journals-1
  ObjectType-Feature-1
  content type line 23
  scopus-id:2-s2.0-69349102768
  
• Descripción: A good evaluation of the Quaternary uplift of the Rhenish shield is a key element for the understanding of the Cenozoic geodynamics of the western European platform in front of the alpine arc. Previous maps of the massif uplift relied on fluvial incision data since the time of the rivers' Younger Main Terrace to infer a maximum post-0.73 Ma uplift of ~ 290 m in the SE Eifel. Here, we propose a new interpretation of the incision data of the intra-massif streams, where anomalies in the terrace profiles would result from knickpoint retreat in the tributaries of the main rivers rather than from tectonic deformation. We also use additional geomorphological data referring to (1) deformed Tertiary planation surfaces, (2) the history of stream piracy that severely affected the Meuse basin in the last 1 Ma, and (3) incision data outside the Rhenish shield. A new map of the post-0.73 Ma uplift of the Rhenish shield is drawn on the basis of this enlarged dataset. It reduces the maximum amount of tectonic uplift in the SE Eifel to ~ 140 m and modifies the general shape of the uplift, namely straightening its E–W profile. It is also suggested that an uplift wave migrated across the massif, starting from its southern margin in the early Pleistocene and currently showing the highest intensity of uplift in the northern Ardennes and Eifel. These features seem to favour an uplift mechanism chiefly related to lithospheric folding and minimize the impact on the topography of a more local Eifel plume.
  
• Editor: Elsevier B.V
  
• Idioma: Inglés