气候变化领域集成服务门户(CCPortal): Reappraisal of Variscan tectonics in the southern French Massif Central

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DOI	10.1016/j.tecto.2020.228477
	Reappraisal of Variscan tectonics in the southern French Massif Central
	Chardon D.; Aretz M.; Roques D.
发表日期	2020
ISSN	00401951
卷号	787
英文摘要	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 Cévennes 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 hinterland-ward thrust systems. The shift from sinistral transpression to dextral transtension along the Cévennes 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. © 2020 Elsevier B.V.
关键词	Cévennes fault Iberian-Armorican syntax Montagne Noire Nappe tectonics Sheath fold Transpression Wildflysch
英文关键词	Kinematics; Shearing; Strike-slip faults; Syntactics; Foreland basin; Gravitational collapse; Kinematic Analysis; Nappe stacking; Plate convergence; Strike-slip fault systems; Thrust systems; Transpression; Fault slips; folding; foreland basin; Hercynian orogeny; lower crust; nappe; shear; strike-slip fault; tectonics; transpression; France; Massif Central
语种	英语
来源期刊	Tectonophysics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/207726
作者单位	GET, Université de Toulouse, CNRS, IRD, UPS, CNES, Toulouse, F-31400, France
推荐引用方式 GB/T 7714	Chardon D.,Aretz M.,Roques D.. Reappraisal of Variscan tectonics in the southern French Massif Central[J],2020,787.
APA	Chardon D.,Aretz M.,&Roques D..(2020).Reappraisal of Variscan tectonics in the southern French Massif Central.Tectonophysics,787.
MLA	Chardon D.,et al."Reappraisal of Variscan tectonics in the southern French Massif Central".Tectonophysics 787(2020).