| DOI: | 10.1016/j.tecto.2020.228477
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| 论文题名: | Reappraisal of Variscan tectonics in the southern French Massif Central |
| 作者: | Chardon D.; Aretz M.; Roques D.
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| 刊名: | Tectonophysics
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| ISSN: | 00401951
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| 出版年: | 2020
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| 卷: | 787 | | 语种: | 英语
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| 中文关键词: | Cévennes fault
; Iberian-Armorican syntax
; Montagne Noire
; Nappe tectonics
; Sheath fold
; Transpression
; Wildflysch
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| 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
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| 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. |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/170560
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| Appears in Collections: | 气候变化与战略
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作者单位: | GET, Université de Toulouse, CNRS, IRD, UPS, CNES, Toulouse, F-31400, France
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| Recommended Citation: | |
Chardon D.,Aretz M.,Roques D.. Reappraisal of Variscan tectonics in the southern French Massif Central[J]. Tectonophysics,2020-01-01,787
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