International Geologiical Congress - Oslo 2008

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EUR-09 Geology of the Southern Permian Basin area - Part 2

 

Cenozoic palaeogeography of the Southern Permian Basin area

 

Robert Knox, British Geological Survey (United Kingdom)
Angelika Kothe, Federal Institute for Geosciences and Natural Resources (Germany)
Erik Rasmussen, Geological Survey of Denmark and Greenland (Denmark)
Noel Vandenberghe, Stratigraphy and Paleontology Group (Belgium)
Iwan De Lugt, Utrecht University (Netherlands)
Peter Balson, British Geological Survey (United Kingdom)
Martin Hiss, Geologischer Dienst Nordrhien-Westfalen (Germany)
Chris King, Private (United Kingdom)
Gerda Standke, Sachsisches Landesamt fur Umwelt und Geologie (Germany)
Jacek Kasinski, Polish Geological Institute (Poland)
Aleid Bosch, TNO-NITG (Netherlands)
 

 

In Cenozoic times, the Southern Permian Basin area included the western, southern and eastern margins of the southern North Sea Basin. The palaeogeography was largely controlled by differential uplift of basement blocks, such as the Cornubian, Armorican, Rhenish and Bohemian massifs, that contributed clastic sediment to the basin throughout the Cenozoic. The distribution of marginal sands associated with these sources areas provides a good indication of the timing of uplift of the individual structures. Other structural elements, though not contributing significant amounts of sediment, also had an important inflence on the palaeogeography by acting as positive areas, or 'swells', that were only intermittently exposed. Some of these swells were associated with long-lived basement structures, such as the Start-Cotentin Ridge, which caused restriction or closure of the English Channel seaway as times of low relative sea level. Others were associated with inversion structures, and had the greatest palaeogeographic impact at times of active inversion.

A profound change in the palaeogeographic configuration within the Southern Permian Basin area took place at the Eocene-Oligocene transition, when uplift of the Fennoscandian Shield led to the first significant influx of sediment from the north and east. Continued relative uplift of the eastern and, later, southeastern source areas combined with a deteriorating climate to generated large-scale sediment influx into the eastern part of the southern North Sea Basin.

Ten maps will be presented to illustrate key stages in the evolution of Cenozoic palaeogeogaphy of the Atlas area.

 

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