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Transpressional tectonics and nappe stacking along the Southern Variscan Front of Morocco |
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| Authors: | Andrea Cerrina Feroni Alessandro Ellero Marco G Malusà Giovanni Musumeci Giuseppe Ottria Riccardo Polino Leonardo Leoni |
| Institution: | 1. CNR Istituto di Geoscienze e Georisorse, Via S. Maria 53, Pisa, 56126, Italy 2. Dipartimento di Scienze Geologiche e Geotecnologie, Università di Milano-Bicocca, Piazza della Scienza, 4, Milano, 20126, Italy 4. CNR Istituto di Geoscienze e Georisorse, Via Valperga Caluso 35, Torino, 10123, Italy 3. Dipartimento di Scienze della Terra, Università di Pisa, Via S. Maria 53, Pisa, 56126, Italy |
| Abstract: | The Southern Variscan Front in the Tinerhir area involves Palaeozoic allochthonous units (Ouaklim and Tilouine units) thrust onto the northern edge of the West African Craton during late Carboniferous time. Illite crystallinity data highlight an anchizonal grade for the Ouaklim Unit, and a diagenesis-anchizone transition for the Tilouine Unit during deformation phase D1. The tectonic stack is crosscut by major dextral reverse faults bounding E–W trending domains of dominant shortening deformation (central domain) and strike-slip deformation (northern and southern domains), later segmented by a network of post-Variscan faults. This complex deformation pattern is the result of kinematic partitioning of dextral transpression along the Southern Variscan Front, coeval with the Neovariscan (300–290 Ma) oblique convergence observed at the scale of the whole Moroccan Variscides. Partitioning of dextral transpression described in the Tinerhir area is consistent with dextral wrench faulting along the Tizi n’ Test Fault, and with Appalachian-style south-directed thrusting in the Tinerhir and Bechar-Bou Arfa areas. |
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