Baamar, B. and Badra, L. and Gaouzi, A. and Benyounes, M. and Souiah, M. (2017) Structural control of the fluorite vein mineralization of El Hammam district (central Morocco) and implication for regional exploration Contrôle structural des minéralisations filoniennes à fluorine du district d'El Hammam (Maroc central) et implication pour l'exploration régionale. Bulletin de l'Institut Scientifique, Section Sciences de la Terre (39). pp. 1-24.

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Abstract

The deposit of El Hammam fluorite is located in the Palaeozoic basement of the central Morocco. The deposit extension development requires the establishment of its structural model. Structural surveys have permitted to distinguish three types of fluorite structures: the first oriented N40E is carried by the major faults; the second developed between the previous have N55E to N60E and N70E to N75E as mean directions, they correspond respectively to Riedels fractures (SR1 and SR2); the third type, less frequent, is E-W trend tension gash. Structural analysis of major faults provide a cinematic expressed by (a) reverse faults during the hercynian major folding phase (shortening NW-SE); (b) a normal dextral motion related to transtensive setting under a regional ENE-WSW shortening and (c) evolved to normal motion under extensive regime linked both to relaxation or a regime change. Therefore, fluorite mineralizations successively deposited are mainly controlled by these tectonic events according to the following chronology: (i) the transtensional event is responsible for host-rock brecciation (B1) and the spate calcite crystallization; (ii) a second hydraulic brecciation (B2) of the calcite is accompanied by the placing of the economic green fluorite; (iii) during a re-opening of previous structures, the banded fluorite (purple or white) locally economic took place. The continuum of extension event gives rise to a late sulphides mineralization (galena, pyrrhotite, chalcopyrite, sphalerite, and pyrite), quartz and chalcedony. It should be noted that the late silicification has corroded a part of the fluorite according to the exploitation sites. Late faults N130E to N140E (designated Fy in situ) post mineralization were noted. The set of these structures defines a mega-shear zone over (NE-SW) about 8 km of width and more than 10 km of length. Such results offer perspectives of extension and open possibilities for regional fluorite exploration. Otherwise, they also incite to the valorization of the potential in sulphides and tin oxides expressed in this district. © 2017 Universite Mohammed V, Institut Scientifique.

Item Type: Article
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/2862

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