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dc.contributor.authorLenhart, Antje
dc.contributor.authorJackson, Christopher AL
dc.contributor.authorBell, Rebecca E.
dc.contributor.authorDuffy, Oliver B.
dc.contributor.authorGawthorpe, Rob
dc.contributor.authorFossen, Haakon
dc.PublishedLenhart A, Jackson CA, Bell RE, Duffy OB, Gawthorpe R L, Fossen H. Structural architecture and composition of crystalline basement offshore west Norway. Lithosphere. 2019;11(2):273-293eng
dc.description.abstractNumerous 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 offshore continuation of these structures, into the northern North Sea, where they are suspected to have influenced the structural evolution of the North Sea rift, is largely unknown. Existing interpretations of the offshore continuation of Caledonian and Devonian structures are based on simple map-view correlations between changes in offshore fault patterns and pronounced onshore structures, without providing evidence for the presence, nature, and geometry of offshore, basement-hosted structures. By integrating three-dimensional (3-D) seismic, borehole, and onshore geological and petrophysical data, as well as two-dimensional (2-D) forward modeling of gravity and magnetic data, we reveal the structural architecture and composition of the crystalline basement on the Måløy Slope, offshore west Norway. Based on 3-D mapping of intrabasement reflection patterns, we identified three basement units that can be correlated with the Caledonian thrust belt, and the major Devonian Nordfjord-Sogn detachment zone, located only 60 km to the east, onshore mainland Norway. Similar to that observed onshore, offshore crystalline basement of the Proterozoic basement (Western Gneiss Region) and allochthons is folded into large-scale antiforms and synforms. These units are separated by the strongly corrugated Nordfjord-Sogn detachment zone. Our analyses show that different types of crystalline basement can be distinguished by their seismic reflection character, and density and magnetic properties. We speculate that the main causes of the observed intrabasement reflectivity are lithological heterogeneities and strain-induced structures such as shear and fracture zones. Our interpretation of the architecture of crystalline basement offshore west Norway has important implications for the location of the suture zone between Baltica and Laurentia.en_US
dc.publisherGeological Society of Americaen_US
dc.rightsAttribution-NonCommercial CC BY-NCeng
dc.titleStructural architecture and composition of crystalline basement offshore west Norwayen_US
dc.typePeer reviewed
dc.typeJournal article
dc.rights.holderCopyright 2019 The Author(s)en_US
dc.relation.projectNorges forskningsråd: 215591

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