New field data integrated by fission-track (FT) analysis unravel an innovative scenario for the post-Variscan evolution of the eastern Anti-Atlas. This area, unaffected by Meso-Cenozoic tectonics according to most workers, is crosscut by crustal faults bearing evidence of a polyphase deformation history. Apatite FT ages, ranging between 284 and 88 Ma, point to fast Neogene exhumation and unravel contrasting cooling paths across major faults. Results show that the study area was buried beneath 2 km of allochthonous Variscan units, now eroded. The eastern Anti-Atlas acted as the southern shoulder of the Atlasic rift in the Mesozoic, and underwent a dextral transpressional structuring of Neogene age followed by sub-meridian shortening. The southern front of Atlasic deformation is therefore located inside the Anti-Atlas region, and it is still active.

Malusa', M., Polino, R., Cerrina Feroni, A., Ellero, A., Ottria, G., Baidder, L., et al. (2007). Post-Variscan tectonics in eastern Anti-Atlas (Morocco). TERRA NOVA, 19(6), 481-489 [10.1111/j.1365-3121.2007.00775.x].

Post-Variscan tectonics in eastern Anti-Atlas (Morocco)

MALUSA', MARCO GIOVANNI;
2007

Abstract

New field data integrated by fission-track (FT) analysis unravel an innovative scenario for the post-Variscan evolution of the eastern Anti-Atlas. This area, unaffected by Meso-Cenozoic tectonics according to most workers, is crosscut by crustal faults bearing evidence of a polyphase deformation history. Apatite FT ages, ranging between 284 and 88 Ma, point to fast Neogene exhumation and unravel contrasting cooling paths across major faults. Results show that the study area was buried beneath 2 km of allochthonous Variscan units, now eroded. The eastern Anti-Atlas acted as the southern shoulder of the Atlasic rift in the Mesozoic, and underwent a dextral transpressional structuring of Neogene age followed by sub-meridian shortening. The southern front of Atlasic deformation is therefore located inside the Anti-Atlas region, and it is still active.
Articolo in rivista - Articolo scientifico
post-Variscan tectonics; eastern Anti-Atlas; Variscan front; Atlas front; inversion tectonics; fission-track analysis
English
481
489
Malusa', M., Polino, R., Cerrina Feroni, A., Ellero, A., Ottria, G., Baidder, L., et al. (2007). Post-Variscan tectonics in eastern Anti-Atlas (Morocco). TERRA NOVA, 19(6), 481-489 [10.1111/j.1365-3121.2007.00775.x].
Malusa', M; Polino, R; Cerrina Feroni, A; Ellero, A; Ottria, G; Baidder, L; Musumeci, G
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/5233
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