Lateral variations in tectono-magmatic style along the Lofoten–Vesterålen volcanic margin off Norway

Tsikalas, Filippos; Faleide, Jan Inge; Eldholm, Olav

doi:10.1016/s0264-8172(01)00030-7

Cited by 75 publications

(119 citation statements)

References 66 publications

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“…In the Lofoten Margin, another rift event occurred towards the end of the Early Cretaceous (Hansen et al, 1992;Blystad et al, 1995;Løseth, H., Tveten, 1996;Dor e et al, 1999;Tsikalas et al, 2001).…”

Section: The Lofoten Segment Of the Norwegian Passive Continental Marginmentioning

confidence: 99%

“…The initial framework of Hansen et al (1992), in which two distinct periods of rifting are recognized in the Early Cretaceous, has been adopted by several more recent studies (Koch and Heum, 1995;Brekke, 2000;Tsikalas et al, 2001;Surlyk, 2003). However, two alternative schools of thought exist; following Dor e (1992), Dor e (1997), Dor e et al (1999) and Hansen et al (2012), the Early Cretaceous is characterised by a period of rifting that began in the Valanginian.…”

Section: The Lofoten Segment Of the Norwegian Passive Continental Marginmentioning

confidence: 99%

“…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%

“…For the Lofoten margin a change in extension direction has been invoked for the Late Jurassic to Early Cretaceous rift episode based on the development of NE-SW-to E-W-striking faults in addition to continued activity of NNE-SSW-striking ones (Tsikalas et al, 2001;Bergh et al, 2007), similar to other areas of the Norwegian continental shelf (Faerseth et al, 1997;Clifton et al, 2000). This suggests that since the Permo-Triassic rift episode, the extensional stress field vector had rotated c. 30e50 clockwise.…”

Section: Evolution Of the Regional Stress Regime During The Mesozoicmentioning

confidence: 99%

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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%

Section: The Lofoten Segment Of the Norwegian Passive Continental Marginmentioning

confidence: 99%

Section: The Lofoten Segment Of the Norwegian Passive Continental Marginmentioning

confidence: 99%

Section: Evolution Of the Regional Stress Regime During The Mesozoicmentioning

confidence: 99%

See 2 more Smart Citations

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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“…In many cases, these systems, when subparallel to the extension direction, have been interpreted as transfer faults of the normal faults, such as at the North Sea [Gibbs, 1984], the Atlantic margin of Brazil [Milani and Davison, 1988], of Newark [Schlische, 1992], Galicia [Boillot et al, 1995], West Africa [Clemson et al, 1997;Watts and Stewart, 1998], Norway [Dorè et al, 1997;Tsikalas et al, 2001], the Suez Rift [McClay and Khalil, 1998], the Basin and Range [Martin et al, 1993;Duebendorfer and Black, 1992], and the East African Rift System [Rosendahl, 1987;Faulds and Varga, 1998]. In other cases, three-dimensional strain [Reches, 1978;Krantz, 1989] and viscosity or density instabilities [Watterson et al, 2000] have been proposed to explain the development of transverse faults under a constant extensional regime.…”

Section: Introductionmentioning

confidence: 99%

Transverse systems along the extensional Tyrrhenian margin of central Italy and their influence on volcanism

2006

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[1] The Tyrrhenian margin of central Italy has undergone Plio-Quaternary extension, developing NW-SE normal faults and NE-SW faults. The NE-SW faults decrease in frequency toward NE with the stretching factor b, becoming negligible for b < 1.3. Plio-Quaternary volcanoes, aligned NW-SE, formed at the intersection among NE-SW and NW-SE faults; fissure eruptions are mostly controlled by NE-SW faults. Structural field data show normal motions for 76% of NW-SE Quaternary faults and transtensive for 73% of NE-SW Quaternary faults. Analogue experiments simulating the NE-SW Tyrrhenian extension show that transverse transtensive faults form with differential extension Db > 0.21. These data suggest that the NE-SW transtensive structures are transfer faults of the NW-SE normal faults due to relevant differential extension (Db > 0.21) within a stretched crust (b > 1.3). The minor dip-slip and strikeslip components of the NE-SW and NW-SE faults, respectively, possibly result from the NW-SE extension due to the southeastward slab retreat beneath the Calabrian arc. The NE-SW and NW-SE extensions in the central southern Tyrrhenian Sea account for the composite kinematics of the NE-SW structures, which, in turn, exert a twofold role in controlling volcanism. Where their dip-slip component forms basins, the associated decompression induces magma accumulation (developing central volcanoes) at the intersection among NW-SE and NE-SW systems. Where transfer faults are mainly strike slip, their inferred subvertical attitude enhances their permeability to magma, accounting for the observed NE-SW fissure eruptions. Regional extension, forming NW-SE faults, enhances the overall generation and rise of magma along the margin, but NE-SW structures focus magma rise and emplacement at shallower levels. Citation: Acocella, V., and R.

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Deep structure of the Lofoten‐Vesterålen segment of the Mid‐Norwegian continental margin and adjacent areas derived from 3‐D density modeling

et al. 2017

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To understand the major structural features of the sedimentary cover and crystalline crust of the Lofoten‐Vesterålen margin and the northern part of the Vøring segment of the Mid‐Norwegian continental margin, a lithosphere‐scale 3‐D structural model has been constructed. This model extends from the exposed crystalline rocks of the Fennoscandian Shield in the east to the Cenozoic oceanic domain of the Norwegian‐Greenland Sea in the west, covering the Vestfjorden, Ribban, and Røst Basins and the northern parts of the Vøring Basin and Trøndelag Platform. All available published and/or released data have been used to set the initial 3‐D model which has been validated by means of 3‐D density forward modeling to obtain a gravity‐consistent 3‐D structural/density model. Results from the 3‐D density modeling reveal that relatively thick sedimentary rocks are present in the distal Røst Basin below the lava flows. The presence of a low‐density more than 20 km thick granitic body has been modeled within the middle‐upper crystalline crust beneath the eastern part of the Vestfjorden Basin and the adjacent mainland. Moreover, the results of the 3‐D density modeling indicate the presence of an atypical low‐density lithospheric mantle beneath a large part of the Lofoten‐Vesterålen margin which is required to fit the regional component of the modeled gravity with the observed one. The pronounced crustal feature within the model area is the Bivrost Lineament that appears to be the deeply seated lithosphere‐scale boundary that delineates clearly the Lofoten‐Vesterålen segment from the Vøring margin showing contrasting densities and crustal thicknesses.

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Lateral variations in tectono-magmatic style along the Lofoten–Vesterålen volcanic margin off Norway

Cited by 75 publications

References 66 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

Transverse systems along the extensional Tyrrhenian margin of central Italy and their influence on volcanism

Deep structure of the Lofoten‐Vesterålen segment of the Mid‐Norwegian continental margin and adjacent areas derived from 3‐D density modeling

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