Architecture of the distal and outer domains of the Mid-Norwegian rifted margin: Insights from the Ran-Gjallar ridges system

Based on a 3D seismic cube and regional 2D long-offset seismic reflection profiles, we propose a reconsideration of the architecture of the Mid-Norwegian outer Wring margin. A system comprising large-magnitude detachment faults and steeper fault arrays was mapped together with key sedimentary markers to provide constraints on the structural history of the outer Ran-Gjallar ridges system. Additionally, a detailed mapping of the so-called 7-reflection' permitted a revision of the nature, origin and tectono-magmatic significance of this debated major reflector. Based on our results, we develop a more general discussion on the final evolutionary stages of rifted margins, including the construction of the outer domain, the birth of an oceanic spreading centre and the definition of breakup. (C) 2016 Elsevier Ltd. All rights reserved.