Abstract
Deep structure of the northern North Sea and southwestern Norway based on 3D density and magnetic modelling
Highlights
In order to analyse the regional configuration of the crystalline crust within the northern North Sea and the adjacent Norwegian mainland, a lithosphere-scale 3D structural model has been constructed in the framework of the Crustal Onshore–Offshore Project (COOP)
In accordance with Fichler et al (2011), who proposed that the lower crustal block with high magnetic susceptibility, responsible for the origin of anomaly M6, is represented by inherited serpentinites, we propose that a similar mechanism can be applied to the origin of anomalies M7 and M8
It can be stated that an integration of all available structural data in combination with the 3D gravity analysis allowed us to evaluate a firstorder configuration of the crystalline crust within the northern part of the North Sea and adjacent areas of the Norwegian mainland
Summary
In order to analyse the regional configuration of the crystalline crust within the northern North Sea and the adjacent Norwegian mainland, a lithosphere-scale 3D structural model has been constructed in the framework of the Crustal Onshore–Offshore Project (COOP). The investigated area covered by the 3D model (see purple frame in Fig. 1) is characterised by a smoothed bathymetry within most parts of the North Sea. Exceptions are observed only along the southern coast of Norway and within some fjords where depths to the sea floor reach more than 700–1300 m. The 3D structural model covers the main tectonic units of the northern North Sea and adjacent areas of SW Norway (Fig. 2). Offshore, this includes major sedimentary depocentres within the Central and Viking grabens, the Maystrenko, Y.P., Olesen, O., Ebbing, J.
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