Architecture of the distal and outer domains of the Mid-Norwegian rifted margin: Insights from the Rån-Gjallar ridges system. (November 2016)

• Record Type: Journal Article
• Authors: Peron-Pinvidic, Gwenn; Osmundsen, Per Terje
• Is Part Of: Marine and petroleum geology. Volume 77(2016:Nov.)
• Page Start: 280
• Page End: 299
• Publication Date: 2016-11
• Subjects: Mid Norway -- Vøring -- Rån -- Gjallar -- Rifting -- Margin -- Breakup -- Distal domain -- Outer domain -- Stratigraphy -- Magma; Submarine geology -- Periodicals; Petroleum -- Geology -- Periodicals; Géologie sous-marine -- Périodiques; Pétrole -- Géologie -- Périodiques; Petroleum -- Geology; Submarine geology; Periodicals; Electronic journals; 551.468
• DOI: 10.1016/j.marpetgeo.2016.06.014
• Languages: English
• ISSNs: 0264-8172

Abstract

Abstract: 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 Vøring 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 Rån-Gjallar ridges system. Additionally, a detailed mapping of the so-called 'T-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. Highlights: Study of the outer domain of the Mid-Norwegian Vøring rifted margin. Detailed interpretation of the Gjallar-Rån ridges. Breakup is a complex and composite (tectono-magmatic) geological process. We should discuss 'magma-rich' and 'magma-poor' breakup, and not 'magma-rich' and 'magma-poor' margins.