Caractérisation Géologique et Minéralogique du gite de gypse de Djebel El Garsa hammam Sokhna (wilaya de Sétif)

Abstract

The main purpose of this work is to know the geology of the site and also the mineralogical and economic interest of the gypsum The triassic outcrop of Jebel El Garsa is about 58 km southeast of the city of Setif and north-east of Algeria. It is part of the high plains of Sétifienne; it occupies the eastern plain of Hammam Sokhna Lithostratigraphically the study area is represented by formations ranging from Triassic to Quaternary. According to geophysical reconnaissance by electrical prospecting (1974) indicating that it was a thin blade. The principal useful substances in this diapir are mainly gypsum and anhydrite and other minerals such as calcite and iron oxides and hydroxides, the regional triassic outcrop gypsum deposits are in four forms. (fibrous, crystalline, granular and microcrystalline). The geological characters, the mineralogical characterization by chemical analysis by Xray fluorescence as well as XRD could confirm the data of the petrography The evaporitic deposits due to the lagoon regime that prevailed in the Triassic Period with an arid climate and a high degree of evaporation which led to the precipitation of ions Ca ++, So3--, Na +, Cl- giving deposits salt and gypsum.