Deep structure of the Porcupine Basin from wide-angle seismic data

• Published in: Geological Society, London, Petroleum Geology Conference series
• Main Authors: Watremez, Louise, Prada, Manel, Minshull, Tim, O 'Reilly, Brian, Chen, Chen, Reston, Tim, Shannon, Pat, Wagner, Gerlind, Gaw, Viola, Klaeschen, Dirk, Edwards, Rose, Lebedev, Sergei
• Other Authors: Institut des Sciences de la Terre de Paris (iSTeP), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), National Oceanography Centre Southampton (NOC), University of Southampton, Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 (LOG), Institut national des sciences de l'Univers (INSU - CNRS)-Université du Littoral Côte d'Opale (ULCO)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD France-Nord ), School of Cosmic Physics Dublin, Dublin Institute for Advanced Studies (DIAS), School of Geography, Earth and Environmental Sciences Birmingham, University of Birmingham Birmingham, School of Earth Sciences, University College Dublin Dublin (UCD), Helmholtz Centre for Ocean Research Kiel (GEOMAR)
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2016
• Subjects: [SDU.STU]Sciences of the Universe [physics]/Earth Sciences; Median Ridge; North Atlantic
• Online Access: https://hal.science/hal-01399022; https://hal.science/hal-01399022/document; https://hal.science/hal-01399022/file/PGC8.26_R1.pdf; https://doi.org/10.1144/PGC8.26

International audience 15 The Porcupine Basin, part of the frontier petroleum exploration province west of Ireland, has an 16 extended history that commenced prior to the opening of the North Atlantic Ocean. Lithospheric 17 stretching factors have previously been estimated to increase from <2 in the north to >6 in the south of 18 the basin. Thus, it is an ideal location to study the processes leading to hyperextension on continental 19 margins. The Porcupine Median Ridge (PMR) is located in the south of the basin and has been 20 alternatively interpreted as a volcanic feature, a serpentinite mud diapir, or a tilted block of 21 continental crust. Each of these interpretations has different implications for the thermal history of the 22 basin. We present results from travel-time tomographic modelling of two ~300-km-long wide-angle 23 seismic profiles across the northern and southern parts of the basin. Our results show: (1) the 24 geometry of the crust, with maximum crustal stretching factors up to 6 and 10 along the northern and 25 southern profiles, respectively; (2) asymmetry of the basin structures, suggesting some simple shear 26 Article text Click here to download Article text PGC_Proceeding-revised.docx