Les bourrelets marginaux des hautes latitudes (Marginal bulges of high latitudes : what we learn from north atlantic fringes). Introduction

• Published in: Bulletin de l'Association de géographes français
• Format: Article in Journal/Newspaper
• Language: English
• Published: PERSEE 1982
• Subjects: Atlantique Nord; Iles Britanniques; Labrador; Scandinavie; bourrelets; marges passives; North Atlantic
• Online Access: http://www.persee.fr/doc/bagf_0004-5322_1982_num_59_489_7933; https://doi.org/10.3406/bagf.1982.7933

Abstract. - Our aim is to define : -a) Individualization of peripheral bulges with their style (faults or flexures) - b) Rythm of uplift punctuated by the development of stepped planation surfaces which indicate periods of tectonic quiescence or at least of a relative stability a great number of surveys carried out on the continental shelf brought complementary information on sedimentation (fades thickness deposits ages). It is then possible to precise the principal stages - c) Working mechanisms with their geophysical implications. The problem stands not only at the Moho layer but also at the level of discontinuity of the base of the lithosphere in contact with the asthenosphere. Résumé. - L'objet de cette première partie est une tentative pour cerner le style le rythme et les mécanismes de l'individualisation des bourrelets à partir d'exemples régionaux (l'Atlantique nord) et de considérations théoriques.