Bourque, H. and Barbanson, L. and Sizaret, S. and Branquet, Y. and Ramboz, C. and Ennaciri, A. and El Ghorfi, M. and Badra, L. (2015) A contribution to the synsedimentary versus epigenetic origin of the Cu mineralizations hosted by terminal Neoproterozoic to Cambrian formations of the Bou Azzer-El Graara inlier: New insights from the Jbel Laassel deposit (Anti Atlas, Morocco). Journal of African Earth Sciences, 107. pp. 108-118.

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Abstract

The Neoproterozoic to Cambrian formations that compose the cover of the Bou Azzer-El Graara inlier, host a great number of Copper occurrence whose origin is largely discussed. To bring some light to this debate, structural, petrographic and geochemical observations were performed on the copper deposit of Jbel Laassel. This deposit, located at the extreme ESE of the Bou Azzer-El Graara inlier, is mined since 2012. At the district scale, the ore bodies localize in a folding band that extends along a NE-SW direction. At macroscopic, microscopic and scanning electron microscope scales the mineralization appears as banding veins, with locally cockade breccia and comb quartz textures. From the macroscopic scale to the scale of the scanning electron microscope, all these mineralized textures are connected there between forming a stockwork with an auto-similar structure in the range of used scales of observation. At the district scale, this stockwork is preferentially located in the anticlinal hinges of the folding band. Principal component analyses of geochemical database enable to distinguish several groups of chemical elements, each of these groups corresponding to the different lithologies and to the copper mineralization. This last group does not show any correlation with the distinguished lithological groups. All these observations bring new arguments to an epigenetic origin for the copper mineralization of the Jbel Laassel deposit, with a formation contemporary or posterior with the folding band development attributed to Variscan deformation. © 2015 Elsevier Ltd.

Item Type: Article
Uncontrolled Keywords: Cambrian; copper; folding; formation mechanism; host rock; inlier; lithology; mineralization; ore body; Proterozoic; synsedimentary tectonics, Anti Atlas; Atlas Mountains; Morocco
Subjects: Earth and Planetary Sciences
Divisions: SCIENTIFIC PRODUCTION > Earth and Planetary Sciences
Depositing User: Administrateur Eprints Administrateur Eprints
Last Modified: 31 Jan 2020 15:46
URI: http://eprints.umi.ac.ma/id/eprint/2887

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