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

Ruiz, G.M.H., Sebti, S., Negro, F., Saddiqi, O., Frizon De Lamotte, D., Stockli, D., Foeken, J., Stuart, F. , Barbarand, J. and Schaer, J.P. (2011) From central Atlantic continental rift to Neogene uplift - western Anti-Atlas (Morocco). Terra Nova, 23(1), pp. 35-41. (doi:10.1111/j.1365-3121.2010.00980.x)

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Abstract

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 °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.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Stuart, Professor Finlay and Foeken, Dr Jurgen
Authors: Ruiz, G.M.H., Sebti, S., Negro, F., Saddiqi, O., Frizon De Lamotte, D., Stockli, D., Foeken, J., Stuart, F., Barbarand, J., and Schaer, J.P.
Subjects:G Geography. Anthropology. Recreation > GE Environmental Sciences
College/School:College of Science and Engineering > Scottish Universities Environmental Research Centre
Journal Name:Terra Nova
Publisher:Wiley-Blackwell Publishing Ltd.
ISSN:0954-4879
ISSN (Online):1365-3121
Published Online:29 December 2011

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