Horizon 1 1 17 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES Tectonophysics art. 228477 [16 p.] Nappe tectonics Sheath fold Transpression Wildflysch Montagne Noire Cevennes fault Iberian-Armorican syntax FRANCE MASSIF CENTRAL MONTAGNE NOIRE CEVENNES 2020 fdi:010078208 ENG Tectonophysics 0040-1951 ISI:000539160100004 10.1016/j.tecto.2020.228477 https://www.documentation.ird.fr/hor/fdi:010078208 https://www.documentation.ird.fr/intranet/publi/2020/07/010078208.pdf 787 Horizon (IRD) The comprehensive kinematic analysis of the Variscan fold nappes and associated wildflysch in the Southeastern Montagne Noire shows that the nappes were thrust northeastwardly along the Cevennes fault as a result of strike-slip-dominated sinistral transpression between 340 and 323 Ma. Macro- and map-scale recumbent folding and nappe stacking were achieved by ENE-directed, strike-parallel thrust shearing. The recumbent folds evolved into sheath folds by interplay of continued strike-parallel thrust shearing and strike-normal shortening manifested by north-verging folds that grew during wildflysch sedimentation. These results call for a tectonic reassessment of the southern side of the Variscides. The foreland basin was decoupled from the hinterland along orogen-scale sinistral fault(s) trending at a high angle to the orogenic trend, which interacted with a variety of hinterlandward thrust systems. The shift from sinistral transpression to dextral transtension along the Cevennes fault after 317 Ma accompanied the closure of the Iberian-Armorican syntax by accommodating northeastward escape and gravitational collapse of the northern limb of the syntax. These results illustrate the impact of the shift from plate convergence-controlled to escape-controlled kinematics on shear sense reversal and lower crust exhumation along long-lived strike-slip fault systems. 064 UR234