Abstract

Regional analysis of new 2D and 3D multichannel seismic data has improved interpretation of the crustal configuration and structural style along the Norwegian margin. Five domains with different structural styles and evolutions are defined along the outer Vøring Basin: (1) the Nyk High–Naglfar Dome; (2) the north Gjallar Ridge; (3) the Gleipne saddle; (4) the south Gjallar Ridge; (5) the Rån ridge. Early Campanian–Early Paleocene and Early to mid-Cretaceous extensional events are evidenced. Timing of deformation and structural styles observed along each segment reflect a lateral variation of the rifted system, probably affected by magma-tectonic processes. Correlation with the deep structures of the outer Vøring Basin shows that the shallow structure in that basin is directly controlled by a deep-seated, strong, high-amplitude reflection (the T reflection), marking the top of a high-velocity body (Vp >7 km s−1). The relation between the lower-crustal architecture and the subsurface basin structures has implications for the margin evolution and for the nature of the high-velocity body.

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