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

Details

Serval ID
serval:BIB_2CE5E5E3B490
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
From central Atlantic continental rift to Neogene uplift - western Anti-Atlas (Morocco)
Journal
Terra Nova
Author(s)
Ruiz G.M.H., Sebti S., Negro F., Saddiqi O., Frizon de Lamotte D., Stockli D., Foeken J., Stuart F., Barbarand J., Schaer J.P.
ISSN-L
0954-4879
Publication state
Published
Issued date
2011
Peer-reviewed
Oui
Volume
23
Pages
35-41
Language
english
Abstract
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.
Create date
18/10/2012 20:28
Last modification date
20/08/2019 13:11
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