Blar i Faculty of Mathematics and Natural Sciences på forfatter "Fossen, Haakon"
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3-D seismic images of an extensive igneous sill in the lower crust
Wrona, Thilo; Magee, Craig; Fossen, Haakon; Gawthorpe, Rob; Bell, Rebecca E.; Jackson, Christopher Aiden Lee; Faleide, Jan Inge (Peer reviewed; Journal article, 2019-05-31)When continents rift, magmatism can produce large volumes of melt that migrate upwards from deep below the Earth’s surface. To understand how magmatism impacts rifting, it is critical to understand how much melt is generated ... -
Basement structure and its influence on the structural configuration of the northern North Sea rift
Fazli Khani, Hamed; Fossen, Haakon; Gawthorpe, Robert; Faleide, Jan Inge; Bell, Rebecca E. (Peer reviewed; Journal article, 2017-06)The northern North Sea rift basin developed on a heterogeneous crust comprising structures inherited from the Caledonian orogeny and Devonian postorogenic extension. Integrating two‐dimensional regional seismic reflection ... -
Complex fault system revealed by 3-D seismic reflection data with deep learning and fault network analysis
Wrona, Thilo; Pan, Indranil; Bell, Rebecca E.; Jackson, Christopher A.-L.; Gawthorpe, Rob; Fossen, Haakon; Osagiede, Edoseghe Edwin; Brune, Sascha (Journal article; Peer reviewed, 2023)Understanding where normal faults are located is critical for an accurate assessment of seismic hazard; the successful exploration for, and production of, natural (including low-carbon) resources; and the safe subsurface ... -
Contractional deformation of porous sandstone: Insights from the Aztec Sandstone, SE Nevada, USA
Fossen, Haakon; Zuluaga, Luisa F.; Ballas, Gregory; Soliva, Roger; Rotevatn, Atle (Peer reviewed; Journal article, 2015-05)Contractional deformation of highly porous sandstones is poorly explored, as compared to extensional deformation of such sedimentary rocks. In this work we explore the highly porous Aztec Sandstone in the footwall to the ... -
Deep Crustal Flow Within Postorogenic Metamorphic Core Complexes: Insights From the Southern Western Gneiss Region of Norway
Wiest, Johannes; Osmundsen, Per Terje; Jacobs, Joachim; Fossen, Haakon (Peer reviewed; Journal article, 2019)Viscous crustal flow can exhume once deeply buried rocks in postorogenic metamorphic core complexes (MCCs). While migmatite domes record the flow dynamics of anatectic crust, the mechanics and kinematics of solid‐state ... -
From Caledonian collapse to North Sea Rift: The extended history of a metamorphic core complex
Wiest, Johannes; Wrona, Thilo; Bauck, Marit Stokke; Fossen, Haakon; Gawthorpe, Rob; Osmundsen, Per Terje; Faleide, Jan Inge (Journal article; Peer reviewed, 2020)Extensional systems evolve through different stages due to changes in the rheological state of the lithosphere. It is crucial to distinguish ductile structures formed before and during rifting, as both cases have important ... -
Grain Deformation Processes in Porous Quartz Sandstones – Insight from the Clusters of Cataclastic Deformation Bands
Philit, Sven; Soliva, Roger; Ballas, Gregory; Fossen, Haakon (Peer reviewed; Journal article, 2017)Porous sandstones represent classical reservoirs for water or hydrocarbons. Deformation in such granular material is due to tectonic events and occurs through the process of cataclasis, implying the crushing of the grains ... -
The influence of structural inheritance and multiphase extension on rift development, the northern North Sea
Phillips, Thomas B.; Fazlikhani, Hamed; Gawthorpe, Rob; Fossen, Haakon; Jackson, Christopher Aiden Lee; Bell, Rebecca E.; Faleide, Jan Inge; Rotevatn, Atle (Peer reviewed; Journal article, 2019-11-08)The northern North Sea rift evolved through multiple rift phases within a highly heterogeneous crystalline basement. The geometry and evolution of syn‐rift depocenters during this multiphase evolution and the mechanisms ... -
The Patos-Pernambuco shear system of NE Brazil: Partitioned intracontinental transcurrent deformation revealed by enhanced aeromagnetic data
Fossen, Haakon; Harris, Lyal B.; Cavalcante, Carolina; Archanjo, Carlos José; Ávila, Carlos F. (Journal article; Peer reviewed, 2022)The Neoproterozoic-Cambrian (Brasiliano) intracontinental Patos-Pernambuco shear system is developed in Archean to Neoproterozoic crust, reactivating rift margins N of the São Francisco Craton. We here use enhanced ... -
Rift kinematics preserved in deep-time erosional landscape below the northern North Sea
Wrona, Thilo; Whittaker, Alexander C.; Bell, Rebecca E.; Gawthorpe, Rob; Fossen, Haakon; Jackson, Christopher A.-L.; Bauck, Marit Stokke (Journal article; Peer reviewed, 2022)Our understanding of continental rifting is, in large parts, derived from the stratigraphic record. This record is, however, incomplete as it does not often capture the geomorphic and erosional signal of rifting. New 3D ... -
Sand textural control on shear-enhanced compaction bands in poorly-lithified sandstone
Skurtveit, Elin; Ballas, G.; Fossen, Haakon; Torabi, Anita; Soliva, Roger; Peyret, M. (Peer reviewed; Journal article, 2014)Sand textural control on SECB (shear-enhanced compaction band) formation is analyzed combining field observations, detailed material characterization and mechanical testing for poorly lithified sandstone units in Provence ... -
Segmentation of the Caledonian orogenic infrastructure and exhumation of the Western Gneiss Region during transtensional collapse
Wiest, Johannes; Jacobs, Joachim; Fossen, Haakon; Ganerød, Morgan; Osmundsen, Per Terje (Journal article; Peer reviewed, 2021)The (ultra)high-pressure Western Gneiss Region of the Norwegian Caledonides represents an archetypical orogenic infrastructure of a continent–continent collision zone. To test established exhumation models, we synthesize ... -
Seismic expression of shear zones: Insights from 2-D point-spread-function based convolution modelling
Wrona, Thilo; Fossen, Haakon; Lecomte, Isabelle; Eide, Christian Haug; Gawthorpe, Rob (Journal article; Peer reviewed, 2020)Shear zones are common strain localization structures in the middle and lower crust and play a major role during orogeny, transcurrent movements and rifting alike. Our understanding of crustal deformation depends on our ... -
Shear zone evolution during core complex exhumation – Implications for continental detachments
Wiest, Johannes; Fossen, Haakon; Jacobs, Joachim (Journal article; Peer reviewed, 2020)The formation of low-angle detachments involves exhumation of previously ductile material and fault zone weakening. To better understand this relationship, we studied a deeply eroded metamorphic core complex, which formed ... -
Spatial variability in topology, connectivity and permeability of deformation band networks: Insights from the Jurassic Entrada Sandstone, Utah
Heggernes, Hakan; Rotevatn, Atle; Demurtas, Matteo; Nixon, Casey William; Fossen, Haakon (Journal article; Peer reviewed, 2023)Networks of deformation bands have the potential to act as baffles to fluid flow, yet little work has been devoted to addressing their network properties, such as topology and connectivity. Motivated by this, we investigate ... -
Strain migration during multiphase extension, Stord Basin, northern North Sea rift
Fazlikhani, Hamed; Aagotnes, Synne; Refvem, Marte; Hamilton-Wright, James; Bell, Rebecca E.; Fossen, Haakon; Gawthorpe, Rob; Jackson, Christopher A.-L.; Rotevatn, Atle (Journal article; Peer reviewed, 2021)In regions experiencing multiple phases of extension, rift‐related strain can vary along and across the basin during and between each phase, and the location of maximum extension can differ between the rift phase. Despite ... -
Structural architecture and composition of crystalline basement offshore west Norway
Lenhart, Antje; Jackson, Christopher AL; Bell, Rebecca E.; Duffy, Oliver B.; Gawthorpe, Rob; Fossen, Haakon (Peer reviewed; Journal article, 2019-02-05)Numerous studies have investigated the geodynamic history and lithological composition of the Proterozoic basement, Caledonian nappes, and Devonian extensional basins and shear zones onshore west Norway. However, the ... -
Topological Characterization of a Fault Network Along the Northern North Sea Rift Margin
Osagiede, Edoseghe Edwin; Nixon, Casey William; Gawthorpe, Rob; Rotevatn, Atle; Fossen, Haakon; Jackson, Christopher A.-L.; Tillmans, Fabian (Journal article; Peer reviewed, 2023)The factors that control the spatial variation of the topological characteristics of normal fault networks at the rift-scale are poorly understood. Here, we use 3D seismic reflection data from the northern North Sea to ... -
Zippered Shear Zone Model for Interacting Shear Zones in the Borborema Province, Brazil, as Constrained by U-Pb Dating
Avila, Carlos F.; Archanjo, Carlos J; Fossen, Haakon (Peer reviewed; Journal article, 2019)Shear zones typically interact to form connected systems or networks to accommodate crustal deformation, but our knowledge of how this happens is fragmentary. Understanding branching and interacting shear zones requires ...