Deep structure of the Porcupine Basin from seismic refraction data

Posted by pkm at Mar 06, 2015 05:30 PM |
Louise Watremez (1), Chen Chen (1), Manel Prada (2), Tim Minshull (1), Brian O’Reilly (2), Tim Reston (3), Gerlind Wagner (4), Viola Gaw (4), Dirk Kläschen (4), Patrick Shannon (5) & Rose Edwards (6) - (1) University of Southampton, National Oceanography Centre, Southampton, UK; (2) Geophysics Section, Dublin Institute of Advanced Studies, Dublin, Ireland; (3) School of Geography, Earth and Environmental Sciences, University of Birmingham, Birmingham, UK; (4) Geomar Helmholtz Centre for Ocean Research, Kiel, Germany; (5) School of Geological Sciences, University College Dublin, Dublin, Ireland; (6) NERC, National Oceanography Centre, Southampton, UK

The Porcupine Basin is a narrow V-shaped failed rifted basin of Permo-Triassic to Cenozoic age, with the main rifting phase in the Late Jurassic to Early Cretaceous. It is located offshore SW Ireland, showing increasing stretching factors from less than 1.5 to the North to more than 6 to the South. A ridge feature, the Porcupine Median Ridge, has been identified in the middle of the southernmost part of the basin. During the last three decades, this ridge has been successively interpreted as a volcanic structure, a diapir of partially serpentinized mantle, or a block of continental crust. Its nature still remains debated today. Here, we present the preliminary results of our seismic refraction data processing. We image the deep structure of Porcupine Basin and the geometry of the continental thinning from margin to margin, with a focus on the Porcupine Median Ridge, and compare our results with coincident seismic reflection data. This project started in September 2014 and is funded by the Irish Shelf Programme Study Group (ISPSG) of the Petroleum Infrastructure Programme (PIP).

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