Crustal structure and evolution of the Arctic Caledonides: Results from controlled-source seismology

Aarseth, Iselin; Mjelde, Rolf; Breivik, A. J.; Minakov, Alexander; Faleide, Jan Inge; Flueh, Ernst R.; Huismans, Ritske S.

doi:10.1016/j.tecto.2017.04.022

Cited by 13 publications

(11 citation statements)

References 87 publications

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“…In addition, both magnetic and gravity data (Figure ) are not in favor of such a trend. Elevated deep crustal velocity anomalies, as detected by Aarseth et al () and Breivik et al (, ), may reflect two separate deep crustal heterogeneities underlying Olga and Sørkapp Basins rather than the Caledonian grain.…”

Section: Tectonic Affinity Of the Olga‐sørkapp Regionmentioning

confidence: 81%

“…Two end‐member models are discussed for the Caledonian orogeny—a “one‐branch suture” and a “bifurcating suture” (Figure ; Aarseth et al, ; Barrère et al, , , Breivik et al, , , ; Doré et al, ; Faleide et al, ; Gabrielsen et al, ; Gee et al, , ; Gernigon et al, ; Gernigon & Brönner, ; Gudlaugsson et al, ; Henriksen et al, ; Marello et al, ; Ritzmann & Faleide, , ; Worsley, ). The “one‐branch models” are based on the interpretation of NE‐SW oriented Carboniferous rift basins in the SW Barents Sea in prolongation of Caledonian thrusts and nappes of onshore Scandinavia (brown line in Figure ).…”

Section: Geological Settingmentioning

confidence: 99%

“…The bifurcating model includes an additional N‐S oriented branch toward Svalbard parallel to the present‐day western Barents continental margin (combined brown and red lines in Figure ; Breivik et al, ; Gudlaugsson et al, ). Based on OBS data, the eastern Caledonian suture was proposed to branch off east of Bjørnøya Island (on Stappen High) toward the northeast (Figure ; Aarseth et al, ). The interpretation of this NE oriented Caledonian branch is based on the topography of the basement and the Moho, a westward lateral crustal velocity decrease and crustal reflectivity increase across the Gardabanken High (Aarseth et al, ; Breivik et al, , , ; Eiken, ; Ritzmann & Faleide, ).…”

Section: Geological Settingmentioning

confidence: 99%

“…The correlation of positive potential field anomalies with the basin center was explained by a Paleozoic rift system and corresponding intrusives (Grogan et al ). Wide‐angle seismic lines reveal crustal heterogeneities that are interpreted as accreted island arcs or oceanic terrains emplaced in the course of the Caledonian collision of Baltica, Laurentia, and the microcontinent Barentsia (Aarseth et al, ; Breivik et al, ). However, the relationship between the evolution of W‐E striking Olga Basin and the underlying basement grain remains only poorly understood (Figure ).…”

Section: Introductionmentioning

confidence: 99%

“…The colored lines show published Caledonian trends. The red and brown lines indicate two branches (brown (Gee et al, ) and red (Aarseth et al, )). Other proposed Caledonian structures are light blue (Barrère et al, ), dark blue (Gernigon et al, ), and green cross (Gee & Pease, ).…”

Section: Introductionmentioning

confidence: 99%

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The Paleozoic Evolution of the Olga Basin Region, Northern Barents Sea: A Link to the Timanian Orogeny

Klitzke

Franke

Ehrhardt

et al. 2019

Geochem Geophys Geosyst

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The evolution of the Olga Basin region in the northern Norwegian Barents Sea and its relation to the Caledonian and Timanian orogenies is poorly understood due to sparse geophysical data and the lack of well control. In 2015, the German Federal Institute for Geosciences and Natural Resources (BGR) acquired deep multichannel seismic lines as well as gravity and magnetic data. The new seismic data reveal that the Olga and Sørkapp Basins evolved as a W-E striking half-graben system along a major normal fault in the north and a smaller normal fault in the south, respectively. Deep crustal undulating high-amplitude reflections below the Olga and Sørkapp Basins coincide with W-E striking local magnetic maxima and may imply that the basins evolved on top of old collisional fabrics. The absence of major compressional deformation implies a post-Caledonian onset of subsidence. The W-E structural configuration of the sedimentary basins is difficult to reconcile with an earlier proposed NE striking Caledonian branch in the northern Barents Sea. Instead, the orientation of the Olga and Sørkapp Basins lines up with Timanian structural trends from the Pechora Basin. We propose that the Olga and Sørkapp Basins experienced transtensional deformation during the late Devonian/early Carboniferous NE-SW regional extension phase whereby inherited Timanian lineaments controlled the final W-E basin configuration. A salient pre-Caledonian Olga-Sørkapp crustal block in the central Barents Sea would also explain the recently proposed NNW rotation of Caledonian nappes and thrust sheets in the southwestern Barents Sea.

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Section: Tectonic Affinity Of the Olga‐sørkapp Regionmentioning

confidence: 81%

Section: Geological Settingmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

The Paleozoic Evolution of the Olga Basin Region, Northern Barents Sea: A Link to the Timanian Orogeny

Klitzke

Franke

Ehrhardt

et al. 2019

Geochem Geophys Geosyst

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Structural inheritance in the North Atlantic

Schiffer

Doré²,

Foulger

et al. 2020

Earth-Science Reviews

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The North Atlantic, extending from the Charlie Gibbs Fracture Zone to the north Norway-Greenland-Svalbard margins, is regarded as both a classic case of structural inheritance and an exemplar for the Wilson-cycle concept. This paper examines different aspects of structural inheritance in the Circum-North Atlantic region: 1) as a function of rejuvenation from lithospheric to crustal scales, and 2) in terms of sequential rifting and opening of the ocean and its margins, including a series of failed rift systems. We summarise and evaluate the role of fundamental lithospheric structures such as mantle fabric and composition, lower crustal inhomogeneities, orogenic belts, and major strike-slip faults during breakup. We relate these to the development and shaping of the NE Atlantic rifted margins, localisation of magmatism, and microcontinent release. We show that, although inheritance is common on multiple scales, the Wilson Cycle is at best an imperfect model for the Circum-North Atlantic region. Observations from the NE Atlantic suggest depth dependency in inheritance (surface, crust, mantle) with selective rejuvenation depending on timescales , stress field orientations and thermal regime. Specifically, post-Caledonian reactivation to form the North Atlantic rift systems essentially followed pre-existing orogenic crustal structures, while eventual breakup reflected a change in stress field and exploitation of a deeper-seated, lithospheric-scale shear fabrics. We infer that, although collapse of an orogenic belt and eventual transition to a new ocean does occur, it is by no means inevitable.

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Basement inheritance and salt structures in the SE Barents Sea: Insights from new potential field data

Gernigon

Brönner

Dumais

et al. 2018

Journal of Geodynamics

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Crustal structure and evolution of the Arctic Caledonides: Results from controlled-source seismology

Cited by 13 publications

References 87 publications

The Paleozoic Evolution of the Olga Basin Region, Northern Barents Sea: A Link to the Timanian Orogeny

The Paleozoic Evolution of the Olga Basin Region, Northern Barents Sea: A Link to the Timanian Orogeny

Structural inheritance in the North Atlantic

Basement inheritance and salt structures in the SE Barents Sea: Insights from new potential field data

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