NE Atlantic continental rifting and volcanic margin formation

• DOI: 10.1144/gsl.sp.2000.167.01.12
• Publication Date: 2008-04-30T18:36:18Z
• Authors: Jakob Skogseid; Sverre Planke; Jan Inge Faleide; Tom Pedersen; Olav Eldholm; Flemming Neverdal
• Keywords: Continental Margin; Margin (machine learning); Passive margin

Abstract Deep seismic data from the Hatton-Rockall region, mid-Norway margin and SW Barents Sea provide images of crustal structure that make it possible to estimate relative amounts thinning for Late Jurassic-Cretaceous Maastrichtian-Paleocene NE Atlantic rift episodes. In addition, plate reconstructions illustrate movements between Eurasia Greenland back Mid-Jurassic time. The system developed as a result series episodes Caledonian orogeny early Tertiary Palaeozoic rifting is poorly constrained, particularly with respect timing. However, rifted basin geometries, inferred be this age, are observed at depth in on flanks younger structures. Intra-continental times caused c. 50–70 km extension subsequent Cretaceous subsidence Rockall Trough-North areas south, north. late Early times, new occurred Trough Labrador associated northward propagation North sea-floor spreading. When spreading was approached apparently became extinct. final episode initiated near Campanian-Maastrichtian boundary, lasted until continental separation Paleocene-Eocene transition, 140 extension. syn-rift earliest periods were affected by widespread igneous activity across 300 wide zone along boundary. deep lower-crustal structural geometries represent boundary conditions better mapping understanding extensional crust. question estimates previously made analysis, aid definition bodies magmatic underplating beneath outer volcanic margins.