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Mesozoic reactivation of Variscan thrusting in the Bristol Channel area, UK

M. BROOKS, P. M. TRAYNER and T. J. TRIMBLE
Journal of the Geological Society, 145, 439-444, 1 May 1988, https://doi.org/10.1144/gsjgs.145.3.0439
M. BROOKS
1Department of Geology, University College, P.O. Box 78, Cardiff CF1 1XL, UK
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P. M. TRAYNER
2Merlin Geophysical Ltd, Merlin House, Boundary Road, Woking, Surrey GU21 5BX, UK
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T. J. TRIMBLE
2Merlin Geophysical Ltd, Merlin House, Boundary Road, Woking, Surrey GU21 5BX, UK
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Abstract

New seismic reflection data from the Bristol Channel area provide direct evidence of a major Variscan thrust in the Palaeozoic basement beneath the Mesozoic Bristol Channel syncline. The thrust has an average southerly dip of about 25° and it rises into the major fault (the Central Bristol Channel fault zone, CBCFZ) at the northern margin of the Bristol Channel syncline. The CBCFZ is attributed to reactivation in extension of the Variscan thrust, probably during the early Cretaceous. There is no evidence for major synsedimentary movement on the CBCFZ, and the Bristol Channel syncline does not represent a rollover structure. Section restoration suggests that the CBCFZ has cut up through a previously tilted sequence of Triassic and Jurassic strata. Pervasive NNW–SSE cross faults are interpreted as original Variscan transfer faults that have been reactivated in the Mesozoic and Tertiary.

  • © Geological Society of London 1988

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Journal of the Geological Society: 145 (3)
Journal of the Geological Society
Volume 145, Issue 3
May 1988
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Mesozoic reactivation of Variscan thrusting in the Bristol Channel area, UK

M. BROOKS, P. M. TRAYNER and T. J. TRIMBLE
Journal of the Geological Society, 145, 439-444, 1 May 1988, https://doi.org/10.1144/gsjgs.145.3.0439
M. BROOKS
1Department of Geology, University College, P.O. Box 78, Cardiff CF1 1XL, UK
  • Find this author on Google Scholar
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P. M. TRAYNER
2Merlin Geophysical Ltd, Merlin House, Boundary Road, Woking, Surrey GU21 5BX, UK
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T. J. TRIMBLE
2Merlin Geophysical Ltd, Merlin House, Boundary Road, Woking, Surrey GU21 5BX, UK
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  • Find this author on PubMed
  • Search for this author on this site

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Mesozoic reactivation of Variscan thrusting in the Bristol Channel area, UK

M. BROOKS, P. M. TRAYNER and T. J. TRIMBLE
Journal of the Geological Society, 145, 439-444, 1 May 1988, https://doi.org/10.1144/gsjgs.145.3.0439
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