Ouguir, H. and Macaudiere, J. and Dagallier, G. (1996) Le Protérozoïque supérieur d'Imiter, Saghro oriental, Maroc: Un contexte géodynamique d'arrière-arc. Journal of African Earth Sciences, 22 (2). pp. 173-189.

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Abstract

The Upper Proterozoic (PII) of Imiter shows a large amount of turbiditic greywackes which are organized into deep sea fans. They were deposited at the foot of the continental slope in an extensional basin prior to the Pan-African orogeny. The extension is associated with mafic volcanism (MORB) enriched into light REE by crustal contamination. Petrological and geochemical data show that the greywackes are immature (23 to 42 feldspars, 11 to 24 lithic fragments) with high concentrations of Na2O, Ba, Co, Cr and Ni. All these features are consistent with an active back-arc environment, the arc itself being situated to the south of the Saghro mountains. However, the source of the sedimentary infill of the basin shows continental characteristics with calc-alkaline affinities. Furthermore, this material comes from the northeast, which is a direction opposite to the arc. The REE pattern is characteristic of an active domain. This domain would correspond to a marginal or back-arc basin, supplied with sediment from two opposing directions.

Item Type: Article
Uncontrolled Keywords: backarc basin; geochemistry; greywacke; petrography; Proterozoic; provenance, Morocco, Imiter
Subjects: Earth and Planetary Sciences
Divisions: SCIENTIFIC PRODUCTION > Earth and Planetary Sciences
Depositing User: Administrateur Eprints Administrateur Eprints
Last Modified: 31 Jan 2020 15:47
URI: http://eprints.umi.ac.ma/id/eprint/2998

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