Unexpected Jurassic to Neogene vertical movements in "stable" parts of NW Africa revealed by low temperature geochronology

Online Access: Get full text
doi: 10.1111/j.1365-3121.2008.00828.x
Author(s): Ghorbal, B.; Bertotti, G.; Foeken, J.; Andriessen, P.
Author Affiliation(s): Primary:
VU University Amsterdam, Department of Isotope Geochemistry, Amsterdam, Netherlands
Netherlands Research Centre for Integrated Solid Earth Science, Netherlands
Scottish Universities Environmental Research Centre, United Kingdom
Volume Title: Terra Nova
Source: Terra Nova, 20(5), p.355-363. Publisher: Blackwell, Oxford, United Kingdom. ISSN: 0954-4879
Note: In English. 43 refs.; illus., incl. 4 tables, sketch maps
Summary: In Morocco, it is generally considered that post-Hercynian vertical movements were limited to the Atlas system, the passive continental margin and the Rif. Apatite FT and He ages from the Moroccan Meseta (Rehamna and Zaer Massif) document instead two episodes of subsidence and exhumation in Jurassic-Early Cretaceous and during the Late Cretaceous to Neogene. The Meseta subsided to >3 km depth during the Late Triassic to Middle Jurassic and was exhumed to the surface before the Late Cretaceous, during the rift and post-rift stages of Central Atlantic opening. Erosion of the exhuming rocks is responsible for a thick package of terrigenous sands found in the Moroccan offshore and elsewhere along the NW Africa margin. About 1 km of subsidence affected the Meseta during the Late Cretaceous to Eocene. During the Neogene, these areas were brought back to the surface in association with bimodal folding with wavelengths of 100-150 km and >500 km. Abstract Copyright (2008), Blackwell Publishing.
Year of Publication: 2008
Research Program: DSDP Deep Sea Drilling Project
IPOD International Phase of Ocean Drilling
Key Words: 03 Geochronology; Africa; Apatite; Atlantic Ocean; Cenozoic; Cretaceous; DSDP Site 370; DSDP Site 416; Deep Sea Drilling Project; Erosion; Exhumation; Fission-track dating; Geochronology; IPOD; Jurassic; Leg 41; Leg 50; Meseta; Mesozoic; Morocco; Neogene; North Africa; North Atlantic; Phosphates; Plate tectonics; Rifting; Sampling; Tertiary; Vertical movements
Coordinates: N325015 N325015 W0104634 W0104634
N325012 N325012 W0104806 W0104806
Record ID: 2009022605
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from John Wiley & Sons, Chichester, United Kingdom