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Microphotographs showing some emblematic tectonic fabric in formations involved in the processes of mantle exhumation. A. Tectonic breccia after a mylonitic gneiss in the Variscan units. This sample recorded the ductile/brittle transition (BCOR15). B. Microfolds and shear bands in a talcified mantle rocks of the damage zone (crust-mantle detachment) (BCOR19). C. Shear fabric in a chloritized Paleozoic tectonic lens along the crust-mantle detachment (SAR13). D. Ductile deformation in a Mesozoic marble from the pre-rift cover (SAR5).
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