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Integrated Basin Studies — Dynamics of the Norwegian Margin: an introduction

Several lithospheric and upper crustal processes interact in the formation of rift basins and evolution of such basins into passive margins. Similarly, the fillings of rift basins depend on a variety of tectonic, morphological and sedimentary processes. Areas that have passed through a complete evolution from intra-cratonic rifting through breakup and passive margin formation offer particular opportunities to study and link the different processes of basin formation and filling. One such area, that has a unique combination of a well-preserved rock record and abundant data, is the Norwegian North Sea-North Atlantic margin, herein referred to as the Norwegian margin. During post-Caledonian times the North Sea and mid-Norwegian margin underwent several episodes of lithospheric extension (multi-phase rifting), of which the latest led to crustal break-up and accretion of oceanic crust between Norway and Greenland near the Paleocene-Eocene transition. Prominent pre-breakup extensional episodes, in late Permian-Triassic, late Jurassic, early Cretaceous and mid-Cretaceous time, led to the development of the North Sea rift system, the large Cretaceous Vøring and Møre sedimentary basins off Norway, and conjugate equivalents off eastern Greenland. Latest Cretaceous-Paleocene rifting and breakup were accompanied by large-scale igneous activity, developing the present conjugate volcanic margins of the North Atlantic. The North Sea, in particular, is covered with an exceptionally good geological and geophysical industry and academic database, comprising both high-quality geophysical profiles and a large number of industrial wells. About 30 years of active exploration in the North Sea has led to an advanced level of understanding of the geological evolution