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Journal of the Geological Society; 1998; v. 155; issue.3; p. 463-473;
DOI: 10.1144/gsjgs.155.3.0463
© 1998 Geological Society of London

Article

The coastal flexure of Disko (West Greenland), onshore expression of the ‘oblique reflectors’

L. GEOFFROY1, J. P. GELARD2, C. LEPVRIER3 & P. OLIVIER4

1 Laboratoire de Géologie, Département T.A.O., Ecole Normale Supérieure, URA 1316 du CNRS, 75231 Paris Cedex 05, France
2 Laboratoire de Géologie, Université du Maine, 72017 Le Mans, France
3 Département de Géotectonique, Université Pierre et Marie Curie, 75232 Paris Cedex 05, France
4 Laboratoire de Pétrophysique, UMR 5563 du CNRS, 38 rue des 36-Ponts, 31400 Toulouse, France

There is a clear analogy between the coastal flexured basalts of the Disko Island (W Greenland) and the offshore oceanward-dipping reflectors otherwise observed in the volcanic margins of the Thulean Province. Our tectonic analysis suggests that the coastal flexure is of both syn-magmatic and tectonic origin. It is contemporaneous with dyke injection parallel to the axis of the flexure and to an increase in the extension across the area during the Palaeocene. The proposition that the coastal flexure of Disko Island is syn-tectonic and syn-magmatic throws new light on its origin. We propose that this flexure and, by extrapolation, part of the plume-related seaward-dipping reflectors elsewhere, may correspond to volcanic layers forming a roll-over anticline overlying a continentward-dipping detachment.

Key Words: Passive margins • flood basalts • dykes • faults • stress




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