Three-dimensional seismic data from the Barents Sea margin reveal evidence of past ice streams and their dynamics

Geology ◽  
2004 ◽  
Vol 32 (8) ◽  
pp. 729 ◽  
Author(s):  
Karin Andreassen ◽  
Lena Charlotte Nilssen ◽  
Bjarne Rafaelsen ◽  
Luppo Kuilman
Keyword(s):  
Seismic Data ◽  
Barents Sea ◽  
Three Dimensional ◽  
Ice Streams ◽  
The Barents Sea

Geomorphology of buried glacigenic horizons in the Barents Sea from three-dimensional seismic data

2002 ◽  
Vol 203 (1) ◽  
pp. 259-276 ◽  
Author(s):  
B. Rafaelsen ◽  
K. Andreassen ◽  
L. W. Kuilman ◽  
E. Lebesbye ◽  
K. Hogstad ◽  
...  
Keyword(s):  
Seismic Data ◽  
Barents Sea ◽  
Three Dimensional ◽  
The Barents Sea

The latest 3D density model of the Barents Sea crust

2021 ◽  
Author(s):  
David Arutyunyan ◽  
Ivan Lygin ◽  
Kirill Kuznetsov ◽  
Tatiana Sokolova ◽  
Tatiana Shirokova ◽  
...  
Keyword(s):  
Gravitational Field ◽  
Gravity Field ◽  
Barents Sea ◽  
Sedimentary Cover ◽  
Three Dimensional ◽  
Density Model ◽  
Potential Fields ◽  
The Barents Sea ◽  
Moho Boundary ◽  
Earth's Crust

<p>The 3D gravity inversion was realized in order to reveal the density features of the Earth's crust the Barents Sea. The original 3D density model of the region includes both lateral and depth density`s changes.<br>The main steps of the modelling are:</p><p>- The calculation of the anomalies of the gravity field in Bouguer reduction with the three-dimensional gravitational effect correction of the seabed.</p><p>- Gravity field correction for the three-dimensional influence of the Moho boundary (according to the GEMMA model). The excess density at the Moho picked by minimizing the standard (root-mean-square) deviation of the gravity effect from GEMMA Moho boundary and Bouguer anomalies. So, the regional density jump at the Moho border is 0.4 g / cm<sup>3</sup>.</p><p>- Based on regional geological and geophysical data about the deep structure of the Barents Sea, it was developed generalized dependence of density changes by depth in the sedimentary cover and the consolidated part of the earth's crust.</p><p>- Compilation of 3D original model of the base of the sedimentary cover on predictive algorithms of neural networks. The neural network was trained on several reference areas located in different parts Barents area using a number of potential fields transformations and the bottom of the sedimentary cover from model SedThick 2.0.</p><p>- Using the resulted dependence of the crust density change by depth and a new model of the sedimentary cover bottom, the gravitational field corrected for the impact of the sedimentary cover with variable density.</p><p>- The finally stripped gravity field is used to create density model above and below the base of the sedimentary cover. Frequency filtering on Poisson wavelets [Kuznetsov et al., 2020] had been used for the final separation of the gravitational field into its components.</p><p>- The inverse task was solved using specialized volumetric regularization [Chepigo, 2020].</p><p>As a result, the crust of the Barents Sea density inhomogeneities were localized by depth and laterally in 3D model, which became the basis for further structural-tectonic mapping.</p><p>References</p><p>Chepigo L.S. GravInv3D [3D density modeling software]. Patent RF, no. 2020615095, 2020. https://en.gravinv.ru/</p><p>Kuznetsov K.M. and Bulychev A.A. GravMagSpectrum3D [Program for spectral analysis of potential fields]. Patent RF, no. 2020619135, 2020.</p>

Relationship between salt and crustal tectonics in the Sørvestsnaget Basin, SW Barents Sea

2020 ◽  
Author(s):  
Gaia Travan ◽  
Benjamin Bellwald ◽  
Sverre Planke ◽  
Virginie Gaullier ◽  
Dwarika Maharjan ◽  
...  
Keyword(s):  
Seismic Data ◽  
Potential Field ◽  
Field Data ◽  
Barents Sea ◽  
Hydrocarbon Exploration ◽  
Salt Tectonics ◽  
Potential Field Data ◽  
The Barents Sea ◽  
Western Side ◽  
Seismic Anomalies

<p>The geology of the Barents Sea has been widely studied because of the interest for hydrocarbon exploration. Our study focuses on the SW Barents Sea, on the western side of the Senja Ridge in the Sørvestsnagets Basin, which is still a less deciphered area. Located at the limit of the continental shelf, this deep Cretaceous basin is characterized by a several-kilometer-thick sequence of Cenozoic sediments locally influenced by salt structures. Because of the peculiar rheological characteristics of salt, the deposition of evaporites during Permo-Carboniferous times still represents a key aspect to deeply understand the geological setting because salt tectonics considerably affects the brittle sedimentary cover.</p><p>5,500 km<sup>2</sup> of high-quality 3D seismic data, integrated with potential field data and existing wells, led to the interpretation of the main horizons and unconformities in the sedimentary sequence, with focus on the salt structures.</p><p>The top of the salt is characterized by a strong positive-amplitude reflection in the seismic data, and has been interpreted with a line spacing of 100 m. Subsequent gridding of the interpreted horizon to a bin size of 12.5 m highlights that the geomorphology for the top of the three salt structures is particularly complex, with presence of salt horns and development of minibasins above the salt. Integration of potential field data shows a strong correlation between salt structures and low values in Bouguer-Gravity anomalies. Different families of faults related to salt and to crustal tectonics have been mapped, and strong seismic anomalies related to faults above the salt structures are identified at multiple stratigraphic levels. Part of these faults have been active until 20 000 years ago, and are rarely active at present day.</p><p>The three salt structures interpreted on the western side of the Senja Ridge have a total extent of around 800 km<sup>2</sup> and are mainly the consequence of different pulses of reactive diapirism, due to several diachronous rifting events during the opening of the Barents Sea. After the opening of the Sørvestsnagets Basin, salt tectonics continued and was influenced by crustal movements and glacial sedimentation and erosion in this pull-apart basin setting.</p><p>The presence of the strong seismic anomalies above the salt structures is interpreted as gas accumulations, which makes this topic of particular interest for the future development of the oil and gas industry of the SW Barents Sea.</p>

Three-dimensional model for the crust and upper mantle in the Barents Sea region

Eos ◽  
2005 ◽  
Vol 86 (16) ◽  
pp. 160 ◽  
Author(s):  
H. Bungum ◽  
O. Ritzman ◽  
N. Maercklin ◽  
J.-I. Faleide ◽  
W. D. Mooney ◽  
...  
Keyword(s):  
Upper Mantle ◽  
Barents Sea ◽  
Three Dimensional ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Crust And Upper Mantle ◽  
The Barents Sea

scholarly journals Signature of ice streaming in Bjørnøyrenna, Polar North Atlantic, through the Pleistocene and implications for ice-stream dynamics

2009 ◽  
Vol 50 (52) ◽  
pp. 17-26 ◽  
Author(s):  
Karin Andreassen ◽  
Monica Winsborrow
Keyword(s):  
Barents Sea ◽  
Extensional Flow ◽  
Three Dimensional ◽  
Ice Streams ◽  
Ice Dynamics ◽  
Ice Flow ◽  
Ice Stream ◽  
Geomorphic Features ◽  
Common Behaviour ◽  
Fast Flow

AbstractThe geomorphology of palaeo-ice-stream beds and the internal structure of underlying tills can provide important information about the subglacial conditions during periods of fast flow and quiescence. This paper presents observations from three-dimensional seismic data, revealing the geomorphology of buried beds of the Bjørnøyrenna (Bear Island Trough) ice stream, the main drainage outlet of the former Barents Sea ice sheet. Repeated changes in ice dynamics are inferred from the observed successions of geomorphic features. Megablocks, aligned in long chains parallel to inferred ice-stream flowlines, and forming dipping plates that are thrust one on top of another, are taken as evidence for conditions of compressive ice flow. Mega-scale glacial lineations (MSGL) and pull-apart of underlying sediment blocks suggest extensional flow. The observed pattern of megablocks and rafts overprinted by MSGL indicates a change in ice dynamics from a compressional to an extensional flow regime. Till stiffening, due to subglacial freezing, is the favoured mechanism for creating switches in sub-ice-stream conditions. The observed pattern of geomorphic features indicates that periods of slowdown or quiescence were commonly followed by reactivation and fast flow during several glaciations, suggesting that this may be a common behaviour of marine ice streams.

Comparison of the crustal structures of the Barents Sea and the Baltic Shield from seismic data

2000 ◽  
Vol 321 (4) ◽  
pp. 429-447 ◽  
Author(s):  
Yu.P Neprochnov ◽  
G.A Semenov ◽  
N.V Sharov ◽  
J Yliniemi ◽  
K Komminaho ◽  
...  
Keyword(s):  
Baltic Shield ◽  
Seismic Data ◽  
Barents Sea ◽  
The Barents Sea ◽  
Crustal Structures ◽  
The Baltic

Crustal structure of the Barents Sea from seismic data

1985 ◽  
Vol 114 (1-4) ◽  
pp. 213-231 ◽  
Author(s):  
N.I. Davydova ◽  
N.I. Pavlenkova ◽  
Yu.V. Tulina ◽  
S.M. Zverev
Keyword(s):  
Crustal Structure ◽  
Seismic Data ◽  
Barents Sea ◽  
The Barents Sea
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