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Fig. 7


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The lenticular layer in the Saraillé crust-mantle detachment. A. General view of the Col de Saudarie quarry showing the phacoidal fabric with decameter-sized tectonic lenses. B. Detailed view of the core of a fully serpentinized mantle lens showing undeformed pyroxenite layering. C. Detailed view of a tectonic lens (phacoid) exposed along the eastern edge of the quarry. Some serpentine fibers define a local lineation (lin.) on the shallow dipping surface of the phacoid. Lineation can be observed locally on subvertical planes (v.) cross-cutting the phacoids. D. Detailed view of a series of tectonic lenses cross-cut by tight N-S trending fractures. Note that some fractures are deformed and show curvatures in relation with late gliding along the shallow dipping surface of the phacoids. Gliding may relate here to slope unstability. E and F. Detailed view of the phacoidal fabric in the lenticular layer on the Saraillé western flank.

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