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Journal of the Geological Society; 2006; v. 163; issue.1; p. 47-59;
DOI: 10.1144/0016-764905-029
© 2006 Geological Society of London

Original Article

The mid-Norwegian margin: a discussion of crustal lineaments, mafic intrusions, and remnants of the Caledonian root by 3D density modelling and structural interpretation

J. Ebbing1, E. Lundin1,3, O. Olesen1 & E.K. Hansen2

1 Geological Survey of Norway (NGU), Leiv Eirikssonsvei 39, 7491 Trondheim, Norway (e-mail: Joerg.Ebbing@ngu.no)
2 BP Norge AS, PO. Box 197, 4065 Stavanger, Norway
3 Present address: Statoil ASA, Forusbeen 50, 4035 Stavanger, Norway

The high-density lower crustal body (LCB) on the mid-Norwegian margin is almost universally interpreted to represent magmatically underplated material, added to the crust during Early Tertiary opening of the NE Atlantic. The thickness of the LCB is uneven, and its distribution along the margin is sharply limited by margin-perpendicular lineaments. Three-dimensional density modelling constrained by petrophysical and seismic data was performed to investigate the expression of the various lineaments (Bivrost, Jan Mayen, Gleipne, etc.) in the crustal architecture, with and without the LCB. The Bivrost Lineament, separating the Vøring and Lofoten margin segments, is clearly expressed and so is arguably a lineament in the SW Vøring margin. Notably, most of the lineaments can be interpreted as offshore prolongations of major onshore detachments stemming from Late Caledonian orogenic collapse. An alternative interpretation of the LCB is thus that it represents high-grade metamorphic rocks, remnant from the Caledonian root. Determining the nature of the LCB has profound effects for the volume estimate of magmatic rocks in the North Atlantic Igneous Province, and consequently also for the degree of crustal thinning and heat flow.





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