Paléogéographie et tectonique dans la zone de décrochement de Creisset-Le Poil (Branche nord-ouest de l'arc de Castellane, Alpes de Haute Provence)- Alpes françaises

Abstract : The surveyed region is located at the western branch of the Castellane arc, which is part of the southern subalpine chains. Located exactly between the Tertiary Barrême and Majastres synclines, it is characterized by a group of North-South, right-handed, transcurrent faults which more or less obliquely act upon a group of N-S to NW-SE. preexisting folds and scales. This strongly deformed zone coincides whith an area of lesser sedimentation during Jurassic times, which corresponds to the transition between the "provençal", and the "dauphinois" (sensu lato), paleogeographie areas. The part played by structural discontinuities in the localization of the transcurrent faults is brought out; the latter alignment closely fit an area characterized by (1) thinner series (for paleogeographie reasons) ; and (2) pre-existing closed anticlines, which have been eroded as far down as gypsum-bearing tri~ssic formations. As far as these former zones of probable weakness have predetermined the position of the transcurrent faults and guided their displacements, a clear picture of the stresses which gave birth to these transcurrent faults cannot be drawn from the latter's directions. As the analytical method employed does not solve the problem, its limitations should be emphasized.
Document type :
Theses
Tectonics. Université Scientifique et Médicale de Grenoble, 1973. French


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Jacques Ganeval. Paléogéographie et tectonique dans la zone de décrochement de Creisset-Le Poil (Branche nord-ouest de l'arc de Castellane, Alpes de Haute Provence)- Alpes françaises. Tectonics. Université Scientifique et Médicale de Grenoble, 1973. French. <tel-00564945>

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