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Evidence for an Early Permian Oceanic Rift in the Northern North Atlantic

  • M. J. Russell
  • D. K. Smythe
Part of the NATO Advanced Study Institutes Series book series (ASIC, volume 36)

Abstract

The Greenland-Svalbard and Proto-Bay of Biscay fault zones are small circles to a common pole, and it can be shown that transform motion on these faults opens the Rockall Trough and the eastern Norwegian Sea. Arthaud and Matte calculate a dextral movement along the Proto-Bay of Biscay fault of more than 100 km. This movement took place between the emplacement of the Variscan granites and the beginning of the Triassic, and we argue here that this was one of the results of ocean floor spreading in Rockall Trough and the eastern Norwegian Sea. Widespread intrusions of dolerite in Sweden, Norway, England and Scotland c. 290 Ma imply that the lithosphere had reached its limit of strength in relative tension and it is surmised that this is the time that the lithosphere began to separate between Greenland and Northwest Europe. Magmatism continued in the Early Permian as evidenced by the Oslo extrusives and fluorite deposits of magmatic derivation in England. Rosemary Bank is an extinct volcano in the northern Rockall Trough, and judging from the remanent magnetic vector, this seamount was probably active during the Permian.

In mid Permian times the Zechstein Sea, which presumably occupied Rockall Trough and the Faeroe-Shetland Channel, as well as the eastern Norwegian Sea, flooded parts of East Greenland, Ireland, England, the North Sea and north-central Europe.

Keywords

Ocean Floor Spreading Rockall Trough Common Pole Fluorite Deposit Oslo Region 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© D. Reidel Publishing Company, Dordrecht, Holland 1978

Authors and Affiliations

  • M. J. Russell
    • 1
  • D. K. Smythe
    • 2
  1. 1.Department of Applied GeologyUniversity of StrathclydeGlasgowScotland
  2. 2.Institute of Geological SciencesEdinburghScotland

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