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

Gernigon, Laurent; Brönner, Marco; Dumais, Marie-André; Gradmann, Sofie; Grønlie, A.; Nasuti, Aziz; Roberts, David L.

doi:10.1016/j.jog.2018.03.008

Cited by 28 publications

(55 citation statements)

References 83 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Eastward increasing metamorphic gradients and severity of deformation (Johansson et al, ; Tebenkov et al, ) imply that the Caledonian suture is located east of Svalbard (Figure b; Barrère et al, , ). However, by following the short‐wavelength magnetic expression of the Caledonian nappes and thrust sheets (Barrère et al, , ; Gernigon et al, , ; Gernigon & Brönner, ), the corresponding Caledonian suture may run west of our study area (red lines in Figure ).…”

Section: Tectonic Affinity Of the Olga‐sørkapp Regionmentioning

confidence: 84%

“…The presence of old zones of weakness may have facilitated magmatism which would explain the basin‐wide positive gravity and magnetic anomalies as well as the elevated velocities in the deep crust (Breivik et al, , , ). Additionally, it appears that this rifting phase coincides with the extensional collapse of the Caledonides and corresponding basin formation in the western Barents Sea and with late Devonian‐early Carboniferous rifting on Svalbard (Baelum et al, ; Gernigon et al, , ; Gernigon & Brönner, ). Later this extensional system was followed by the proto‐Atlantic rifting phase in the western Barents Sea evident in the NE‐SW striking graben, that is, the Nordkapp Basin, across the Kong‐Karl Platform and below the Sentralbanken High (Faleide et al, ; Gernigon et al, ; NPD, ).…”

Section: Tectonic Affinity Of the Olga‐sørkapp Regionmentioning

confidence: 97%

“…These trends are well described onshore and delineated offshore by characteristic potential field anomalies that extend into the Pechora Sea (yellow dotted line in Figure ). The NW‐SE orientation of the Tiddlybanken Basin south of the Fedinsky High is a further indication for the presence of Timanian basement in the SE Barents Sea (Gernigon et al, ). Detrital zircon dating from northern Taymir and a Cambro‐Ordovician unconformity on Severnaya Zemlya (east of Franz‐Josef Land) imply that the Timanides extended northward across the entire eastern Barents Sea as far as to the northern Kara Sea (Gee et al, , ; Pease, ).…”

Section: Geological Settingmentioning

confidence: 99%

“…Recent investigations on the Caledonian grain show that the strike of the Caledonian thrust and nappes rotates counterclockwise from a NE‐SW trend onshore Norway to a NNW‐SSE trend in the SW Barents Sea (Figure ; Barrère et al, , ; Gernigon et al, ; Gernigon & Brönner, ). Short‐wavelength magnetic anomalies are assumed to delineate the Caledonian basement grain (Gernigon et al, , ; Gernigon & Brönner, ). Following these magnetic anomalies from the SW Barents Sea, the Caledonian grain converges northward east of Bjørnøya and broadens again south of Svalbard, indicating a widening of the Caledonian collision zone in the north (Figure b).…”

Section: Tectonic Affinity Of the Olga‐sørkapp Regionmentioning

confidence: 99%

“…The Olga‐Sørkapp region is located in prolongation of assumed NW‐SE striking Timanian trends from the Pechora Basin and the SE Barents Sea (Dovzhikova et al, ; Gernigon et al, ; Roberts & Siedlecka, ; Shulgin et al, ). We suggest from similar magnetic and gravity patterns in both regions that Timanian accretion of Neoproterozoic fragments has occurred further west than previously assumed (Figure ).…”

Section: Tectonic Affinity Of the Olga‐sørkapp Regionmentioning

confidence: 99%

See 4 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

View full text Add to dashboard Cite

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.

show abstract