Journal article

Depth of extensional faulting on the Mid-Norway Atlantic passive margin

  • Mosar, Jon Department of Geosciences, University of Fribourg, Switzerland
    2000
Published in:
  • Norges geologiske undersøkelse Bulletin. - 2000, vol. 437, p. 33-43
English Two crustal-scale cross-sections of the Mid-Norwegian Atlantic passive margin are discussed. Large W- and E-dipping normal faults relate to extension of the continental crust following the Caledonian orogeny and the subsequent opening of the Atlantic Ocean. The passive margin extends from the ocean-continent boundary west of the Vøring Marginal High to the innermost extensional normal faults 90 km west of the Caledonian thrust front. Based on earthquake data and published results of geophysical modelling and seismic interpretation, the average depth to which the normal faults extend in the offshore domain is estimated to 20±5 km. This depth corresponds to the brittle-ductile transition in the crust of the stretched Mid-Norwegian continental margin. Above this transition the crust extended by brittle faulting (tilted blocks); below this limit the crust extended in a ductile manner.
Faculty
Faculté des sciences et de médecine
Department
Département de Géosciences
Language
  • English
Classification
Geology
Other electronic version

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License
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Identifiers
  • RERO DOC 4929
Persistent URL
https://folia.unifr.ch/unifr/documents/299594
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