Les Dolomies des Monts d’Aïn M’lila. Cas du Dj. Teioualt

Abstract

The region of Ain M'lila, located in eastern Algeria, is part of the outer zones of the alpine chain of oriental Algeria. It is an area characterized by large carbonate deposits (limestone and dolomite). These deposits, which are in majority Cretaceous, have been affected by diagenetic events such as dissolutions, replacements, compaction ... etc. Structurally, the massifs of Ain M'lila are characterized by tectonic especially breakable with folded structures. These structures are also affected by many accidents. These brittle accidents include the recesses which are numerous and whose direction is generally NW-SE. Accidents NS direction are also present in the form of faults, especially normal. Outcrops forming the Valanginian of the massifs of Ain M'lila are mainly formed of dolomite. On the industrial side, these dolomites form important deposits of exploitation. Many careers, including that of the massif of Teioualt were implanted in this region. The main objective of these careers is the exploitation of these valanginian dolomite of which physical, chemical and mechanical properties that make them valuable to the exploitation and thus meet the requirements of several industries. Knowledge more detailed of this type of rocks of sedimentary, petrographic and diagenetic point of view is of great importance for understanding the genesis of dolomite (dolomitization), its transformation (dédolomitisation) and its distribution in the space. The characterization physicochemical properties of these dolomites are also of considerable importance for the confirmation of the quality of the material. By projecting the case of the deposit of the massif of Teioualt on dolomitic formations of the other massifs of Ain M'lila, this valanginian dolomite may be a safe bet for future exploitations.