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- W1510971115 abstract "The Cammazes orthogneissic massif in the western Montagne Noire (France) has been affected by numerous tectonic phases during the Hercynian orogeny. The principal deformation, synchronous with a mesozonal metamorphism, is represented by different structural features such as foliation, ‘augen’ structures and deformation of megacrystals. These structural features are essentially varied with the concentration of feldspar megacrystals in the gneisses. The structural studies of these gneisses have allowed the recognition of the nature and the orientation of the principal deformation. To determine the intensity of this deformation, large undeformed feldspar crystals have been used as markers. These crystals have been assimilated to rigid ellipsoidal elements disposed in a random fashion in the initial stage of the mesostase which is considered as a viscous Newtonian fluid. The statistical studies of the orientation of these crystals with reference to the plane of flattening (foliation) has caused the appearance of an anisotropy in the final deformed state. This anisotropy, when compared to that obtained theoretically from a population of rigid elements included in a Newtonian fluid flowing at a slow speed, could evaluate the rate of the finite strain. Dans la Montagne Noire occidentale (France) le massif orthogneissique des Cammazes a été affecté lors de l'orogénèse hercynienne par une tectonique polyphasée. La déformation majeure, synchrone d'un métamorphisme mésozonal, se traduit par différents caractères structuraux (foliation, structure oeillée, déformations des mégacristaux) variant essentiellement avec la concentration des mégacristaux feldspathiques dans les gneiss. L'étude structurale a permis de définir la nature et l'orientation de cette déformation majeure. Pour préciser son intensité les grands cristaux indéformés de feldspaths, utilisés comme marqueurs, ont été assimilés à des éléments rigides ellipsoi'daux disposés dans l'état initial de façon aléatoire dans la mésostase considérée comme un fluide visqueux newtonien. L'étude statistique de leur orientation par rapport au plan d'aplatissement (foliation) fait apparaitre dans l'état final (déformé) une anisotropie. Cette anisotropie comparée à celle obtenue par voie théorique, d'une population d'éléments rigides inclus dans un fluide newtonien s'écoulant à faible vitesse, permet d'évaluer le taux de déformation finie." @default.
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- W1510971115 date "1975-10-01" @default.
- W1510971115 modified "2023-10-14" @default.
- W1510971115 title "Paleodeformations d'un massif orthogneissique" @default.
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- W1510971115 doi "https://doi.org/10.1016/0040-1951(75)90034-7" @default.
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