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Journal of the Geological Society; 2003; v. 160; issue.2; p. 197-208;
DOI: 10.1144/0016-764902-055
© 2003 Geological Society of London

Original Article

Extension, crustal structure and magmatism at the outer Vøring Basin, Norwegian margin

L. Gernigon1, J.C. Ringenbach2, S. Planke3, B.Le Gall1 & H. Jonquet-KolstØ4

1 1Institut Universitaire Européen de la Mer, Place Nicolas Copernic, 29280 Plouzané, France (e-mail: gernigon_geol@hotmail.com)
2 2TotalFinaElf Exploration Libya, Dhat El Imad building, tower 3, P.O Box 91171, Tripoli, Libya
3 3Volcanic Basin Petroleum Research (VBPR), Forskningsparken, Gaustadalléen 21, N-0349 Oslo, Norway
4 4TotalFinaElf Exploration Norge AS, P.O. Box 168, 4001 Stavanger, Norway

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.

Key Words: Norwegian margin • rifting • magmatism • underplating




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