%0 Journal Article
%9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES
%A Chardon, Dominique
%A Aretz, M.
%A Roques, D.
%T Reappraisal of Variscan tectonics in the southern French Massif Central
%D 2020
%L fdi:010078208
%G ENG
%J Tectonophysics
%@ 0040-1951
%K Nappe tectonics ; Sheath fold ; Transpression ; Wildflysch ; Montagne Noire ; Cevennes fault ; Iberian-Armorican syntax
%K FRANCE ; MASSIF CENTRAL ; MONTAGNE NOIRE ; CEVENNES
%M ISI:000539160100004
%P art. 228477 [16 ]
%R 10.1016/j.tecto.2020.228477
%U https://www.documentation.ird.fr/hor/fdi:010078208
%> https://www.documentation.ird.fr/intranet/publi/2020/07/010078208.pdf
%V 787
%W Horizon (IRD)
%X 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