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Journal of the Geological Society; 1991; v. 148; issue.1; p. 191-195;
DOI: 10.1144/gsjgs.148.1.0191
© 1991 Geological Society of London

Article

Seismic studies in the North Celtic Sea Basin: implications for basin development

B. M. O’REILLY1, P. M. SHANNON2 & U. VOGT3

1 Dublin Institute for Advanced Studies, Geophysics Section, 5 Merrion Square, Dublin 2, Ireland
2 Geology Department, University College Dublin, Belfield, Dublin 4, Ireland
3 Institut fur Geophysik, Universität Hamburg, Bundesstrasse 55, Hamburg, Germany

Modelling of seismic refraction data from the North Celtic Sea Basin offshore Ireland demonstrates the presence of a NNW-trending basement flexure. Mesozoic sediments are 4 km thick on the west and 6 km thick on the east of the feature, which is Interpreted as a transfer fault zone lying along a major reactivated basement fracture. Bulk extension is greater in the lower lithosphere than in the upper crust, with the interface being a rheologically regulated mid-crustal detachment surface. The basin developed in response to the interplay between periodic disengagement along the detachment and selective strain transfer into the upper crust.




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