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Bulletin de la Societe Geologique de France; January 2002; v. 173; no. 1; p. 25-35; DOI: 10.2113/173.1.25
© 2002 Societe Geologique de France
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The Pre-Pan-African rifting of Saghro (Anti-Atlas, Morocco): example of the middle Neoproterozoic Basin of Boumalne

Abdelilah Fekkak1, André Pouclet2 and Lakhlifi Badra3

1 Faculté des sciences, Université Chouaïb Doukkali, B.P. 20, 24 000 El Jadida, Maroc
2 ISTO-UMR 6113, Faculté des sciences, Université d’Orléans, B.P. 6759, 45067 Orléans cedex 2, France
3 Faculté des sciences, Université Moulay Ismaïl, B.P. 4010, Meknès, Maroc

Abstract

In the Anti-Atlas, the Boumalne basin includes 3,000 m of Middle Neoproterozoic sediments. It consists of turbiditic deposits folded during the major Pan-African event ca 685 Ma. A syn-sedimentary basaltic pile of lava flows is interbedded in the upper part of the lower formation. These lavas show an initial rift tholeiite (IRT) chemical signature. Petrographical analysis of sediments and typology of detrital zircons indicate a continental margin sedimentation, without any volcano-sedimentary supply from a close volcanic arc. It is concluded that the Boumalne Basin formed in a continental passive margin evolving from an intracontinental rift. This interpretation differs clearly from that of a back-arc basin which is commonly accepted. Hence, the opening of this basin is related to the pre-Pan-African Saghro rift synchronous to the Central Anti-Atlas oceanization, and not to the demise of this oceanic domain along an active margin.

Key Words: Morocco • Anti-Atlas • Pan-African • Middle Neoproterozoic • Continental rifting






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