As the largest country in Africa, Algeria is rich in substantial mineral reserves. This mineral potential continues to be revealed day by day; but unfortunately, they are generally underutilized. The detailed mechanisms of marine sedimentary phosphates origin are still imperfectly known. Our study aims to reconstitute the depositional environment of phosphorites of El Kouif locality NE of Algeria. Our method used an extensive sequential analysis, Microscopic Petrography, X-ray diffractometry, and geochemical analysis. Cross-sections carried out on the outcrops of the El Kouif city, have shown a sub-tabular formation containing almost eight layers of phosphorites. The sequential analysis revealed that the phosphatic series have taken place in a reduced negative mega-sequence. Petrographic observations have shown phosphatic intraclasts bearer of the organic matter at various rates. XRD of whole-rock powder has confirmed the presence of apatite minerals, carbonates quartz, clays, sulfides, and gypsum. The geochemical trend has indicated a high fluctuating content of P₂O₅. The dispersion pattern, correlation coefficient, and mutual relationship of significant major oxides, represented by plotted diagrams; showed that SiO₂, CO₂, MgO, are antipathetically related to P₂O₅. The geochemical behavior between P₂O₅ contents and of CaO, H₂O, Na₂O, SO₃ contents have shown a positive relationship. The richness of the phosphatic rocks in Apatite is autonomous of the depth in the Tebessa basin. The results of the chemical analysis from purified grains were used to calculate the structural formulas for apatite. This non-stoichiometric apatite presented significant anionic substitutions affecting up to 24% of the sites. The higher values of CO₂ have obviously resulted in the richness of organic substance, the notable presence of sulfides minerals, indicated through the high concentration of SO₃, and the lower concentration of Na suggested that the reducing conditions of the basin were prevailing at the time of phosphatic formation in a shallow marine environment.

作为非洲最大的国家，阿尔及利亚矿产资源丰富。这种矿产潜力每天都在不断地显露出来；但不幸的是，它们通常没有得到充分利用。海洋沉积磷酸盐起源的详细机制仍不完全清楚。我们的研究旨在重建阿尔及利亚东北部 El Kouif 地区磷矿的沉积环境。我们的方法使用了广泛的顺序分析、显微岩相学、X 射线衍射和地球化学分析。在 El Kouif 市的露头上进行的横截面显示出一个包含近八层磷矿的子表格地层。序贯分析表明，磷酸盐系列发生在减少的负大序列中。岩相学观察表明，有机质的磷酸盐碎屑内载体以不同的速率存在。全岩粉末的 XRD 证实了磷灰石矿物、碳酸盐石英、粘土、硫化物和石膏的存在。地球化学趋势表明 P 含量波动较大₂ O ₅。重要主要氧化物的分散模式、相关系数和相互关系，用绘制的图表表示；表明 SiO ₂、CO ₂、MgO 与 P ₂ O ₅是反相关的。P ₂ O ₅含量与CaO、H ₂ O、Na ₂ O、SO ₃的地球化学行为内容呈正相关。磷灰石中磷酸盐岩的丰富程度与 Tebessa 盆地的深度无关。纯化颗粒的化学分析结果用于计算磷灰石的结构式。这种非化学计量的磷灰石表现出显着的阴离子取代，影响了多达 24% 的位点。较高的CO ₂值显然导致有机物的丰富，硫化物矿物的显着存在，通过高浓度的SO ₃表明，较低的Na 浓度表明盆地的还原条件在盆地盛行。浅海环境中磷酸盐形成的时间。