Jouhari, A
El-Archi, A
Aarab, M.
El-Attari, A
Ennih, N
Laduron, Dominique
[UCL]
Late Neoproterozoic Vendian volcanic and volcaniclastic rocks are widely distributed in the western High Atlas. They are located north of the Tizi n'Test Fault, separating the West African Craton from a northerly adjacent craton. These volcanic rocks overlie a sernipelitic formation, which represents the equivalent of the Tidilline and Anzi Formations,of the Anti-Atlas. The geochemical characteristics of these volcanic rocks' suggest a calc-alkaline active margin environment associated with the post Pan-African tectonics. They differ from those of the Anti-Atlas by their lower content of K2O. The later rock type was generated by a melting process of the crust subducted beneath the northern craton. A carbonate-shale unit, which contains examples of interstratified calc-alkaline dacite, overlies the volcanic succession, demonstrating that the volcanic activity continued sporadically until Early Cambrian times. (C) 2002 Elsevier Science Limited. All rights reserved.
Bibliographic reference |
Jouhari, A ; El-Archi, A ; Aarab, M. ; El-Attari, A ; Ennih, N ; et. al. [Geochemical features and tectonic setting of Late Neoproterozoic Vendian volcanism in the western High Atlas, Morocco].18th Colloquium of African Geology (GRAZ(Austria), Jul 04-07, 2000). In: Journal of African Earth Sciences (and the Middle East), Vol. 32, no. 4, p. 695-705 (2002) |
Permanent URL |
http://hdl.handle.net/2078.1/61711 |