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Journal of the Geological Society; 1997; v. 154; issue.1; p. 145-150;
DOI: 10.1144/gsjgs.154.1.0145
© 1997 Geological Society of London

Article

The East Irish Sea and adjacent basins: new faults or old?

T.I.M. NEEDHAM1 & RICHARD MORGAN2

1 Badley Earth Sciences Limited, North Beck House, North Beck Lane, Hundleby, Spilsby, Lincolnshire PE23 5NB, UK (e-mail: tim{at}badleys.co.uk)
2 World Geoscience Limited, 3 Walnut Tree Park, Walnut Tree Close, Guildford, Surrey GU1 4TR, UK

The East Irish basin is characterized by three sets of faults, striking N-S, NE-SW and E-W. The Menai Strait fault system bounds the basin to the south and shows pre-Caledonian to Cenozoic movement. This span of activity contrasts with similarly oriented faults, to the north of the basin, which did not exist before the early Carboniferous. N-S faults have a similarly diverse history. Some may have influenced Silurian sedimentation and controlled the disposition of Ordovician volcanic centres in Snowdonia, a contrast with N-S-striking faults in the north of the area which originated as steep strike-slip faults during the late-Silurian. E-W faults control Dinantian and Permo-Triassic thickness variations although, unlike the other fault trends, pre-Carboniferous precursors are not apparent. Some of the basin-bounding faults developed as wholly new faults during Permo-Triassic extension.


Keywords: Irish Sea, faults, reactivation, basins, models.




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