[ Synthèse géologique et métallogénique du gisement aurifère d’Iourirne (Boutonnière de Tagragra d’Akka, Anti-Atlas occidental, Maroc) ]
Volume 24, Issue 1, August 2018, Pages 428–438
Mohamed Benbrahim1, Mohamed AISSA2, and Mohamed ZOUHAIR3
1 Team: Didactics of Geology, Regional Centre for the Education and training, Inezgane, Morocco
2 University Moulay Ismail, Faculty of science, department of geology, laboratory of studies of mineral and energy, P.O. Box 11201, Zitoune, Meknes, Morocco
3 Group MANAGEM / Twin Center, Tower A, Casablanca, Morocco
Original language: French
Copyright © 2018 ISSR Journals. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Iourirne gold deposit is located 260 km to the southeast of Agadir, in Tagragra of Akka inlier (Western Anti-Atlas). The gold mineralization occurs in quartz veins associated with shear zones occurring in E-W direction and cut across the Early Neoproterozoic formations, especially from the dykes of diorite to quartz diorite in the direction from Northeast-Southwest to East-West. Gold is relatively more concentrated in the microcrystalline quartz type (QII). The paragenesis linked to this stage is composed of arsenopyrite, pyrite, pyrrhotite and chalcopyrite. The likely fluid of the establishment of Iourirne gold mineralization is a type L aqueous fluid with a homogenization temperature of 180 – 260°C (mode of 217°C) with a low salinity. This gold mineralization has been placed in the quartz veins of shear zones as a result of the paleofluids interaction flowing under the effect of thermal gradients and tectonic motion operating on fault-valve with magmatic and metamorphic surrounding rocks.
Author Keywords: Gold mineralization, Fault-Valve, Iourirne, Tagragra of Akka.
Volume 24, Issue 1, August 2018, Pages 428–438
Mohamed Benbrahim1, Mohamed AISSA2, and Mohamed ZOUHAIR3
1 Team: Didactics of Geology, Regional Centre for the Education and training, Inezgane, Morocco
2 University Moulay Ismail, Faculty of science, department of geology, laboratory of studies of mineral and energy, P.O. Box 11201, Zitoune, Meknes, Morocco
3 Group MANAGEM / Twin Center, Tower A, Casablanca, Morocco
Original language: French
Copyright © 2018 ISSR Journals. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
Iourirne gold deposit is located 260 km to the southeast of Agadir, in Tagragra of Akka inlier (Western Anti-Atlas). The gold mineralization occurs in quartz veins associated with shear zones occurring in E-W direction and cut across the Early Neoproterozoic formations, especially from the dykes of diorite to quartz diorite in the direction from Northeast-Southwest to East-West. Gold is relatively more concentrated in the microcrystalline quartz type (QII). The paragenesis linked to this stage is composed of arsenopyrite, pyrite, pyrrhotite and chalcopyrite. The likely fluid of the establishment of Iourirne gold mineralization is a type L aqueous fluid with a homogenization temperature of 180 – 260°C (mode of 217°C) with a low salinity. This gold mineralization has been placed in the quartz veins of shear zones as a result of the paleofluids interaction flowing under the effect of thermal gradients and tectonic motion operating on fault-valve with magmatic and metamorphic surrounding rocks.
Author Keywords: Gold mineralization, Fault-Valve, Iourirne, Tagragra of Akka.
Abstract: (french)
Le gisement aurifère d’Iourirne est situé à 260 km au Sud-Est d’Agadir, dans la boutonnière de Tagragra d'Akka (Anti-Atlas occidental). La minéralisation aurifère se présente dans des filons quartzeux, associés à des zones de cisaillement de direction E-W et recoupant les formations du protérozoïque inférieur, particulièrement des dykes de type diorite à diorite quartzique de direction NE-SW à EW. L’or est relativement plus concentré dans le quartz microcristallin type (QII), la paragenèse liée à ce stade, est composée d’arsénopyrite, pyrite, pyrrhotite, chalcopyrite. Le fluide probable de mise en place de la minéralisation aurifère d’Iourirne, est un fluide aqueux de type L, montrant une température d’homogénéisation de 180°C à 260°C (mode à 217°C), avec une salinité faible. Cette minéralisation aurifère s’est mise en place dans les filons quartzeux des zones de cisaillement, suite à l’interaction de paléofluides, circulant sous l’effet de gradients thermiques et de jeux tectoniques fonctionnant en valves sismiques, avec l’encaissant magmatique et métamorphique.
Author Keywords: Minéralisation aurifère, Valves sismiques, Iourirne, Tagragra d’Akka.
How to Cite this Article
Mohamed Benbrahim, Mohamed AISSA, and Mohamed ZOUHAIR, “Geological and metallogenic synthesis of the Iourirne Gold deposit (Tagragra of Akka inlier, Western Anti-Atlas, Morocco),” International Journal of Innovation and Applied Studies, vol. 24, no. 1, pp. 428–438, August 2018.
