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Geological Society, London, Special Publications; 1992; v. 62; p. 327-331;
DOI: 10.1144/GSL.SP.1992.062.01.25
© 1992 Geological Society of London

Offshore West and South of Ireland

Lithospheric stretching in the Porcupine Basin, west of Ireland

Nicky White, Michael Tate1 & John-Joe Conroy2

BIRPS, Bullard Laboratoires, Cambridge CB3 0EZ, UK
1 Total Oil Marine PLC., 16 Palace St., London SW1E 5BQ, UK
2 Marathon Petroleum Co. (Ireland), Centre Park House, Centre Park Rd., Blackrock, Co. Cork, Ireland

The Porcupine Basin is a N-S trending Mesozoic extensional sedimentary basin situated on the continental shelf west of Ireland. All available datasets have been examined in order to see how well the stretching model accounts for the structure and evolution of the basin. Subsidence data indicates that there have been two phases of stretching: at the end of the Jurassic and during the Palaeogene. The earlier phase is of more significance; stretching factors varying from 1.2 at the northern end of the basin to greater than six at the southern end. Stretching factors for the later phase are generally less than 1.1. Crustal thinning information, determined principally from gravity data, is consistent with the above estimates. The timing of volcanism within the basin is broadly consistent with these stretching phases. Significantly, the location of a 150 km long and 20 km wide median igneous ridge is broadly consistent with the steady increase in stretching southwards.





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