From Central Atlantic continental rift to Neogene uplift - western Anti-Atlas (Morocco)

Autor: Ruiz, G.M.H., Sebti, S., Negro, F., Saddiqi, O., de Lamotte, D.F., Stockli, D., Foeken, J., Stuart, F., Barbarand, J., Schaer, J.P.
Přispěvatelé: Institute of Geochemistry & Petrology, Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology [Zürich] (ETH Zürich), Faculté des Sciences Aïn Chock [Casablanca] (FSAC), Université Hassan II [Casablanca] (UH2MC), Université de Neuchâtel (UNINE), Université de Cergy Pontoise (UCP), Université Paris-Seine, Department of Geology [Lawrence], University of Kansas [Lawrence] (KU), Faculty of Earth and Life Sciences [Amsterdam] (FALW), Vrije Universiteit Amsterdam [Amsterdam] (VU), Scottish Universities Environmental Research Centre (SUERC), University of Glasgow-University of Edinburgh, Interactions et dynamique des environnements de surface (IDES), Université Paris-Sud - Paris 11 (UP11)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), CRINON, Evelyne
Jazyk: angličtina
Rok vydání: 2011
Předmět:
Zdroj: Terra Nova
Terra Nova, Wiley-Blackwell, 2011, 23 ((1):), pp.35-41 (IF 2,087)
ISSN: 0954-4879
1365-3121
Popis: International audience; P>To put constraints on the Mesozoic to recent growth of the Anti-Atlas system, we investigated the temperature-time history of rocks by applying extensive low-temperature thermochronological analysis to three Precambrian inliers along the coast and 250 km into the interior. Bedrocks yield old U-Th/He ages on zircon (248-193 Ma) and apatite (150-50 Ma) and also fission-track ages of 173-121 Ma on apatite. These datasets are interpreted as recording passive margin upward movements from central Atlantic rifting until the Early Cretaceous. A phase of sedimentary burial was evidenced for the Cretaceous-Eocene. The extension of this thin (1.5 km) basin is loosely constrained but can be extended to the western regions of northern Africa. Effects of the existing thermal perturbation of lithospheric origin 100 km below the Atlas show that the 120-60 degrees C isotherms are not much deflected. Large-scale uplift has possibly occurred in the western Anti-Atlas since c. 30 Ma and is associated with a mean denudation rate of 0.08 km Ma-1.
Databáze: OpenAIRE
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