ABSTRACT
The sedimentary phosphate
of marine origin mark the Paleo-Eocene period in the region of Tebessa, as
elsewhere in northern Africa. The study sector of El Kouif is considered as a
part of the eastern Saharan Atlas. The lithological description of the studied
Cups has allowed showing a bundle of phosphate take by carbonate formations
sprinkle of flint. The grain size analysis of sandyphosphorites revealed phospharenite deposits which
were generally heterometric and misclassified. Moreover, the mineralogical and
magnetic analysis of some samples of phosphatic sands showed a predominance of
light minerals. As well as the sorting and morphoscopic observation led the
isolation of coprolites, of fossil teeth of fish and lithoclasts but mainly
ovoid phosphatic pellets. The XRD analysis confirmed the presence of apatitic
minerals (Hydroxyapatite, Fluroapatite, francolite and Dahlias), of carbonates
(Calcite, Magnesium calcite, Ankerite,
dolomite), the quartz, opal-CT and even sulphides and gypsum. The petrographic analysis of phosphate samples has
permit to surround primordially, a phosphatic pellets rich in organic matter,
devoid of nucleus and others nucleated. The phases of connections are clay,
carbonate or silica. The notable amounts of allochems have an impact on
textures of typewackstone, packstone, and sometimes grainstone for bio-pel-microspars.