Les affinités magmatiques du volcanisme dinantien des Vosges méridionales (France) ; approche géochimique et interprétation

Three units are present in the Dinantian volcanism from the southern Vosges. The first, of Lower to Middle Visean age, is characterized by an island arc tholeiite and a calc-alkaline association. The second, of early Upper Visean, is a high potassic calc-alkaline series; the third, of late Upper Visean age, is shoshonitic. All oceanic areas being closed during the Devonian, it is difficult to associate this volcanism to an active subduction during early Carboniferous. Several hypotheses could be considered: «posthumous» influence of the Devonian subduction; genesis of this magmatism related to strike-slip fault basins in a collision setting; or within an ensialic «Basin and Range» type basin