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• W3092205444 abstract "&lt;p&gt;The hyper-extended Porcupine Basin, offshore southwest Ireland, is a component of the Eastern North Atlantic rifted continental margin. The basin developed following multiple rifting phases with different extension directions between the Late-Palaeozoic and the Cenozoic. The present-day north-south trend of the Porcupine Basin developed during the main Middle-Jurassic to Lower-Cretaceous rifting phase, which is interpreted to have overprinted earlier extension directions. In this study, we outline the tectono-stratigraphic architecture and the kinematics of the Porcupine Basin derived from seismic interpretation and fault analysis of multiple 2D and 3D seismic datasets.&lt;/p&gt;&lt;p&gt;Our ongoing work identifies different fault networks with distinctive orientations and ages, confirming multiple rifting phases of the basin. The older faults identified strike NE/SW and offset the top of the Jurassic basement and the oldest syn-tectonic sequences. The younger faults strike N/S, offset the whole syn-tectonic stratigraphic sequence and bound the present-day tilted blocks of thinned continental crust. Interactions between these two main generations of faults created strong lateral variability in the geometry of the fault-bounded blocks. In addition, our interpretations highlight strong segmentation along the axis of the basin, evidenced by changes in the structural architecture of the faults along the flanks of the basin, and by rapid changes in the depth to the Jurassic basement from one segment to another. This segmentation occurs across several lineaments that are orthogonal to the main N-S direction of the tilted blocks observed along the flanks of the basin, and that are also observed in the central parts of the basin with gravity data and by the compartmentalisation of sedimentary depocenters. We interpret these lineaments as transfer zones that can be related to the kinematics of the basin. These zones may have accommodated either temporal or spatial changes in the directions of extension, or a stepped variation in E-W extension along the axis of the basin.&lt;/p&gt;&lt;p&gt;Our results help to better understand the controls on the geometry and kinematics of fault systems within the Porcupine Basin, and to better evaluate the structural evolution of the Porcupine Basin and its significance in the broader context of the North Atlantic rifting.&lt;/p&gt;" @default.
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• W3092205444 date "2020-03-23" @default.
• W3092205444 modified "2023-09-25" @default.
• W3092205444 title "Multi-phase development of the Porcupine Basin during the rifting of the North-Atlantic" @default.
• W3092205444 doi "https://doi.org/10.5194/egusphere-egu2020-5065" @default.
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