Neoproterozoic basic dykes of the Zenaga Inlier, central Anti-Atlas, Morocco: Petrology, geochemistry and geodynamic significance

A. Hafid, J. P. Sagon, M. Julivert, M. L. Arboleya, A. Saquaque, A. El-Boukhari, A. Saidi, J. M.F. Soler

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6 Citations (Scopus)

Abstract

Before the Pan-African Orogeny, the Palæoproterozoic basement and its Neoproterozoic cover (limestones and quartzites) of the Zenaga Inlier were cross-cut by a swarm of doleritic dykes. They are more or less altered. The primary mineral assemblage consists of plagioclase, clinopyroxene, very rare orthopyroxene, ilmenite, apatite, micropegmatite and sometimes hornblende and biotite. Mineralogical and geochemical studies indicate that the dolerites are continental tholeiites. Two groups of dykes have been distinguished. Accordingly, rare earth elements, P2O5, Zr, Th, Ba and Sr contents are higher in group I than in group II, which is richer in V. Group I comprises the north-south and northwest-southeast swarms, while group II corresponds to northeast-southwest and east-west swarms, which were emplaced later. These geochemical variations may be explained by a higher degree of melting of the mantle source for the later group II. Doleritic dykes of Zenaga had been emplaced during an extensional episode, prior to Pan-African folding. © 2002 Elsevier Science Limited. All rights reserved.
Original languageEnglish
Pages (from-to)707-721
JournalJournal of African Earth Sciences
Volume32
Issue number4
DOIs
Publication statusPublished - 1 Jan 2001

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