From thickening to extension in the Variscan belt — kinematic evidence from Sardinia (Italy) |
| |
| Authors: | P Conti L Carmignani G Oggiano A Funedda & A Eltrudis |
| |
| Institution: | Dipartimento di Scienze della Ter, Universitàdi Siena, Via Laterina 8, 53100-Siena, Italy,;Dipartimento di Scienze della Ter, Universitàdi Siena, Via Laterina 8, 53100-Siena, Italy,;Istituto di Scienze Geologico-Mineralogiche, Universitàdi Sassari, Corso Angioj 10, 07100-Sassari, Italy,;Istituto di Scienze Geologico-Mineralogiche, Universitàdi Sassari, Corso Angioj 10, 07100-Sassari, Italy,;Progetto CARG Regione Sardegna-Servizio Geologico Nazionale, Via Mameli 115, 09010-Cagliari, Italy |
| |
| Abstract: | The Variscan nappe stack of SE Sardinia originated as a result of several stages of nappe imbrication during the Lower Carboniferous phases of the Variscan orogeny. The crustal shortening caused regional SSW-and W-directed thrusting, greenschist facies metamorphism and open-to-isoclinal polyphase folding. The final stage of shortening produced large-scale antiforms and synforms.
Post-collisional deformation resulted in inversion of earlier thrusts as normal faults, development of low-angle normal faults, and refolding of earlier foliation and thrust planes by asymmetric folds with subhorizontal axial planes. Facing directions of these latest folds are directed horizontally outward from the hinge zones of main antiforms, suggesting that they cannot be regarded as parasitic folds of the latest thickening phase, but instead are the consequence of vertical shortening during gravitational collapse of dome-like km-scale antiforms, leading to denudation of antiformal culminations. |
| |
| Keywords: | |
|
|
