Cretaceous evolution in the Norwegian Sea—a period characterized by tectonic quiescence

Færseth, Roald B.; Lien, Trond

doi:10.1016/s0264-8172(02)00112-5

Cited by 102 publications

(117 citation statements)

References 51 publications

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“…A final rift episode occurred in Campanian to Palaeogene across the Norwegian continental shelf (Skogseid et al, 2000;Faerseth and Lien, 2002;Gernigon et al, 2003). In the Lofoten margin widespread fault block rotation resulted in reinvigorated activity along the major basin bounding fault systems that govern the half-graben architecture of the Lofoten margin (Tsikalas et al, 2001;Faerseth, 2012;Hansen et al, 2012).…”

Section: The Lofoten Segment Of the Norwegian Passive Continental Marginmentioning

confidence: 99%

Evolution of a major segmented normal fault during multiphase rifting: The origin of plan-view zigzag geometry

Henstra

Rotevatn

Gawthorpe

et al. 2015

Journal of Structural Geology

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a b s t r a c tThis case study addresses fault reactivation and linkage between distinct extensional episodes with variable stretching direction. Using 2-D and 3-D seismic reflection data we demonstrate how the Vesterdjupet Fault Zone, one of the basin-bounding normal fault zones of the Lofoten margin (north Norway), evolved over c. 150 Myr as part of the North Atlantic rift. This fault zone is composed of NNE-SSWand NE-SW-striking segments that exhibit a zigzag geometry. The structure formed during Late Jurassic and Early Cretaceous rifting from selective reactivation and linkage of Triassic faults. A rotation of the overall stress field has previously been invoked to have taken place between the Triassic and Jurassic rift episodes along the Lofoten margin. A comparison to recent physical analogue models of non-coaxial extension reveals that this suggested change in least principal stress for the Lofoten margin may best explain the zigzag-style linkage of the Triassic faults, although alternative models cannot be ruled out. This study underlines the prediction from physical models that the location and orientation of early phase normal faults can play a pivotal role in the evolution of subsequent faults systems in multi-rift systems.

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Section: The Lofoten Segment Of the Norwegian Passive Continental Marginmentioning

confidence: 99%

Evolution of a major segmented normal fault during multiphase rifting: The origin of plan-view zigzag geometry

Henstra

Rotevatn

Gawthorpe

et al. 2015

Journal of Structural Geology

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“…Firstly, crustal extension is not occurring on the Norwegian margin today. In particular, the big faults of the Mid-Norwegian necking domain were onlapped and eventually overstepped at around 100 Ma (see Faerseth & Lien 2002;Osmundsen et al 2002;Gomez et al 2004, and references therein). Secondly, although Weissel & Karner (1989) proposed that permanent rift-shoulder uplift is possible should the lithosphere retain finite mechanical strength (e.g., flexural rigidity) long after extension, an integrated body of evidence by authors such as those cited above indicates that Scandinavia's highlands postdate Late Jurassic to Early Cretaceous crustal thinning.…”

Section: Earthquakes and Upliftmentioning

confidence: 99%

Some remarks on the earthquakes of Fennoscandia: A conceptual seismological model drawn from the perspective of hyperextension

Redfield¹,

Osmundsen²

2015

NJG

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To a first order, patterns of Fennoscandia's seismicity reflect the benchmark domain boundaries of its Mesozoic rifted margin. Three distinct belts of earthquakes strike sub-parallel to the generalized line of breakup. The outermost seismic belt (SB1) marks the Taper Break (TB), or the zone of flexural coupling/decoupling between the distal (seaward) and proximal/necking (landward) domains. A coastal belt (SB2) follows the Innermost Limit of Extension, defined as the onset of 39 km-thick crystalline continental crust. An interior belt (SB3) follows the Hinterland Break in Slope, or the landward limit of the Scandinavian rifted margin. Between each belt, large portions of the necking, proximal, and hinterland domains are seismically quiescent. Evaluation of the 'Cumulative Seismic Moment' (CSM w ) per unit area indicates that the release of seismic energy is asymmetric. Although some of Fennoscandia's largest seismic events occur in the dominantly Proterozoic to Archean lithosphere of the eastern craton, 80% of Fennoscandian CSM w maps to the domain boundaries of the western rifted margin. CSM w energy tends to be highest at the TB and decreases system atically towards the continental interior.As proposed by many previous studies, a first-order spatial correlation between Scandinavia's offshore earthquake belt and voluminous, geo logically rapid, sedimentary loading during the Neogene period is evident. However, the presence of thinned, faulted crystalline basement is also a very important factor behind Scandinavia's offshore seismicity. Where the Neogene deposits are at their thickest the underlying crust is dominantly oceanic; CSM w is lower per unit area there than where lesser Plio-Pleistocene loading impacts continental crust that was fully prepared by Mesozoic necking and hyperextension. CSM w data suggest that the 'strength' of the TB and the continental margin's distal domain is significantly less than that of relatively young (ca. 54 Ma) oceanic lithosphere. Our data imply that ridge push does not contribute significantly to Fennoscandia's seismicity. Rather, we find that thin-plate bending stresses stemming from offshore depositional loading conspire with unbuttressed Gravitational Potential Energy (GPE), onshore erosion, and post-glacial isostatic rebound to generate Fennoscandia's earthquakes.We present a conceptual seismological model for Fennoscadia that is consistent with modern hypotheses of extended margin evolution, including post-breakup reactivation by footwall uplift in regions adjacent to sharp crustal taper. Illustrated by simple concepts of elastic thin-plate theory, the model honors our conclusion that Fennoscandian seismicity is principally the product of locally derived stress fields and that far field stress from the oceanic domain is unlikely to penetrate deeply into a hyperextended continental margin. It predicts the locations of the observed seismic belts and seismic gaps with the mathematics of thin-plate bending. It describes how the outer seismic belt will remain localized in the...

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“…The last rift phase began in Campanian (Ren et al, 2003) and ended with continental break-up in Early Eocene. A Mid-Cretaceous rifting-phase (Dore et al, 1999;Brekke, 2000) is debated (Faerseth and Lien, 2002), and has been left out.…”

Section: Rift Phasesmentioning

confidence: 99%

Forward modeling of stretching episodes and paleo heat flow of the Vøring margin, NE Atlantic

Wangen¹,

Fjeldskaar²,

Faleide³

et al. 2008

Journal of Geodynamics

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Cretaceous evolution in the Norwegian Sea—a period characterized by tectonic quiescence

Cited by 102 publications

References 51 publications

Evolution of a major segmented normal fault during multiphase rifting: The origin of plan-view zigzag geometry

Evolution of a major segmented normal fault during multiphase rifting: The origin of plan-view zigzag geometry

Some remarks on the earthquakes of Fennoscandia: A conceptual seismological model drawn from the perspective of hyperextension

Forward modeling of stretching episodes and paleo heat flow of the Vøring margin, NE Atlantic

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