Eocene magmatic breakup along the mid‐Norway rifted margin was preceded by extreme Jurassic‐Cretaceous crustal thinning in a magma‐poor environment. Along SE borders of rift, “top basement” detachment faults with heaves on order 15–40 km evolved at least two stages to become boundaries between moderately thinned (20–30 thick) crust and 100–200 wide, highly extended area thicknesses generally 2 12 under present‐day Møre Vøring basins. In footwalls basin flank detachments, lower middle exhumed...

Rifted margins mark a transition from continents to oceans and contain in their architecture record of rift history. Recent investigations have suggested that multiphase deformation the crust mantle lithosphere leads formation distinct margin domains. The processes control transitions between these domains, however, are not fully understood. Here we use high-resolution numerical simulations show how structural inheritance variations extension velocity rifted temporal evolution. Distinct...

Abstract The large‐magnitude faults that control crustal thinning and excision at rifted margins combine into laterally persistent structural boundaries separate margin domains of contrasting morphology structure. We term them breakaway complexes. At the Mid‐Norwegian margin, we identify five principal complexes proximal, necking, distal, outer domains. Downdip lateral interactions between constitute became fundamental to evolution 3‐D architecture. Different types fault interaction are...

Terra Nova, 23, 349–361, 2011 Abstract The long‐term evolution of kilometre(s) high, seaward‐facing escarpments at passive margins is linked directly to the crustal thinning gradient. development ‘post‐rift’ faults in onshore parts margin and associated distribution drainage patterns, landscape types sediment dispersal patterns reflect this linkage. For seismically well‐imaged Norwegian as well for a number worldwide, we identify scaling relationship that correlates escarpment height with...

Abstract At the junction of Atlantic and Arctic margins, crustal‐scale Keisarhjelmen detachment north‐west Svalbard records previously unrecognised magnitudes extension. The separates a corrugated metamorphic core complex in footwall from mantling Devonian supradetachment basin hangingwall. has top‐N displacement more than 50 km, which is aligned with map‐scale corrugations, an upwards ductile to brittle transition shear related retrogression. This configuration striking similarities...

The Nordfjord‐Sogn Detachment (NSD) zone of western Norway juxtaposes eclogites and gneisses lower crustal affinity with sedimentary deposits, suggesting that the experienced substantial displacement during Devonian extensional denudation Caledonides. Renewed activation occurred in Permian Jurassic‐Cretaceous times. detachment consists a succession fault‐related rocks reflecting various positions deformation mechanisms unroofing. In more detail, 1–2 km thick section NSD mylonites protoliths,...

New structural data, published AFT and topographic data suggest that the latest Cretaceous–Cenozoic uplift of western Norway was associated with normal reactivation Møre–Trøndelag Fault Complex. Reactivation focused along base today's rise, maximum displacements in order 2–3 km. Structural indicate occurred a displacement gradient least NE increasing towards SW. commenced connection Triassic to earliest Cretaceous phases rifting on Norwegian margin, probably continued through most Tertiary....

Abstract Based on observations from the Mid-Norwegian extensional system, we describe how, when and where post-Caledonian continental crust evolved a context of orogenic disintegration to one rifting. We highlight importance deformation stage that occurred between collapse mode high-angle faulting often associated with early rifting crust. This transitional stage, which interpret represent earliest rifting, includes unexpected large magnitudes crustal thinning facilitated through...

Abstract Detachment fault systems typically record displacements in the order of 10s kilometers. The principles that control growth smaller magnitude normal faults are not fully applicable to evolution detachment systems. We use interpretation 2D and 3D seismic reflection data from mid‐Norwegian rifted margin investigate how structural a interacted with effects isostatic footwall rollback produce complex geometries configuration associated supradetachment basins. further lateral interaction...

The tectonic disintegration of the Caledonian orogen through combined extension, contraction and strike-slip was characterized by spatial temporal strain partitioning a period at least 30 Ma. Early to Mid-Devonian exhumation Central Norway basement window associated with retrograde, top-to-the-SW extensional shearing in Høybakken detachment zone, sinistral along Møre–Trøndelag Fault Complex, formation extension-parallel folds. Progressive led increasing localization transition from ductile...

Research Article| February 01, 2009 Active normal fault control on landscape and rock-slope failure in northern Norway P.T. Osmundsen; Osmundsen 1Geological Survey of Norway, 7491 Trondheim, Search for other works by this author on: GSW Google Scholar I. Henderson; Henderson T.R. Lauknes; Lauknes 2Norut, Forskningsparken, 9294 Tromsø, Y. Larsen; Larsen T.F. Redfield; Redfield J. Dehls Geology (2009) 37 (2): 135–138. https://doi.org/10.1130/G25208A.1 Article history received: 28 May 2008...

Research Article| January 01, 2013 The long-term topographic response of a continent adjacent to hyperextended margin: A case study from Scandinavia T.F. Redfield; Redfield † 1Geological Survey Norway, Leiv Eriksons vei 39, N-7491 Trondheim, Norway †E-mail: tim.redfield@ngu.no Search for other works by this author on: GSW Google Scholar P.T. Osmundsen Norway2Department Arctic Geology, University Centre in Svalbard, N-9171, Longyearbyen, Author and Article Information Publisher: Geological...

Abstract Structures related to orogenic “collapse” may provide an important template for reactivation during later rifting. In the proximal rifted margin offshore Norway, tectono‐sedimentary collapse of Caledonian mountain belt became widely eroded but inherited metamorphic core complexes and detachment faults evolved further in Late Paleozoic Earliest Mesozoic time associated with very significant crustal thinning. The earliest rifting mode was dominated by structures that mimic Devonian...

Palaeomagnetic data from fault rocks along major faults in the Laerdal-Gjende Fault System cutting Caledonian structure Jotunheimen area of central south Norway reveals a multi-component remanence pattern. Sample and site-mean directions obtained by thermal cleaning demonstrate simple pattern normal polarity low blocking components reverse high-blocking directions. The magnetic signature is identical to that observed on breccias late west coast Norway. Based available palaeomagnetic...

The Early to Mid-Devonian strain distribution in the Norwegian Caledonides was characterized by large-magnitude extension, extension-normal shortening and sinistral strike-slip. In SW Norway, previous work has shown that angle between orogen Devonian maximum elongation trend decreases northward towards a zone of We provide evidence that: (1) late- post-orogenic extension much more important North–Central Norway than recognized previously; (2) Mid-Devonian, roughly orogen-parallel, persisted...

Abstract Anomalously high velocity and density bodies have been detected in the lower crust on mid-Norwegian margin. The crustal (LCB) are pronounced Møre Vøring margins segments mainly interpreted as either magmatic or high-grade metamorphic origin. Evolutionary models of whole margin heavily affected by interpretation LCB so estimates vertical movements thermal structure area. A 3D gravity magnetic model was constructed to map main geological features acquire distribution LCB. utilizes...

The (ultra)high-pressure Western Gneiss Region of the Norwegian Caledonides represents an archetypical orogenic infrastructure a continent–continent collision zone. To test established exhumation models, we synthesize geochronology and structures major basement windows provide new ages from poorly dated areas. Migmatite U–Pb zircon samples date melt crystallization at c. 405 Ma in Øygarden Complex, expanding spatial extent Devonian migmatization. Micas shear zones Gulen domes yield 40 Ar/ 39...