Géochimie et modélisation thermodynamique de l’amphibolite à grenat de la région Zirmerzouk (Hoggar central)

Abstract

Hoggar is located in the extreme south-east of Algeria in the state of Tamanrasset and covers an area of ( 550,000) ², they are volcanic mountain formations divided into 3 parts (central, orental, oxedontal ).As for the Gour-Oumelalen it is located between the regions of Egéré-Aleksod, in the northeastern part of Hoggar Central. It is made up of an Archean terrain, characterized by red gneisses, as well as granite formations from the Paleo-Protozoic age, neo-protozoic formations with amphibolite facies (Latouche 1978).The Zirmerzouk study area is located in the Gour-Oumelalen ،in the middle of the Hoggar and is distinguished by its rock composition consisting of iron marble linked to an amphibole quartzite agate with fuschite, metapelite and staurotide. In order to study it, we used a complex system of type (MnNCKFMASHTO) Know the history of amphibole and agate rock studied by change of temperature and pressure (pseudosection P - T).