Les filons sédimentaires jurassiques du Pelvoux, enregistreurs des déformations alpines de la bordure orientale du massif cristallin externe de l'Oisans (Alpes occidentales)

Pre-Triassic granites and gneiss of the Pelvoux crystalline massif are cut by neptunian dykes opened during Jurassic extensional tectonic pulses. The dykes can be used to reconstruct a 2 000 m high east-dipping Jurassic fault scarp which bordered the eastern side of Mount Pelvoux palaeohigh. Later, the dykes recorded N-S and E-W alpine shortening,then tilting toward the 5SE, and finally recent N140 compressive stress.