Abstract
The Trias-Eocene «cover » of the Ambin massif is found to be allochthonous in the main Gran Scala outcrop. Three deformation phases are recognized in this cover : D1 produced tight to isoclinal folds, F1, a penetrative axial-planar schistosity, S1, that contains a stretching lineation, L1. Thrusting of the «cover » rocks towards the NNE, onto the Ambin massif, is correlated with the D1 deformation. D2 produced more open minor folds, F2, a coaxial crenulation lineation, L2, and locally an axial-planar crenulation cleavage, S2. The major fold structure, the N W plunging Saint-Nicolas syncline, is a D3 structure. Prior to D3 events the LI lmeation and F 1 fold axes were oriented NNE or NE. Final emplacement of the structurally overlying Schistes lustrés (série de Corne Rousse) post-dated D3 folding. Finite strains have been analysed and calculated axial ratios range from 1 ,66 : 1 ,08 : 0,56 in Lias breccias to 2,03 : 0,98 : 0,50 in Malm breccias. Penetrative S1 schistosity is parallel to the XY plane and the L1 lineation parallels X. Boudinage of more competent beds in Malm breccias was a D1 phenomenon, with perhaps some geometric modifications during D3 folding.
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