%0 Journal Article %T Geochemical Characterizations of the Hypovolcanic Formations of the Pan-African Basement and the Cretaceous Sedimentary Basins of Figuil (North Cameroon) and Léré (South-West Chad): Petrogenetic and Geodynamic Implication of the Pan-African Range of Central Africa (CPAC) %A Klamadji Moussa Ngarena %A Tekoum Lé %A otine %A Baï %A ssemia Ronang Gustave %A Merlin Gountié %A Dedzo %A Djé %A rossem Nenadji Felix %A Bé %A ninga Lé %A opold Felix %A Didi Djamilatou %J International Journal of Geosciences %P 127-153 %@ 2156-8367 %D 2025 %I Scientific Research Publishing %R 10.4236/ijg.2025.162007 %X The study area located between Figuil (Northern Cameroon) and Léré (Southwest Chad) belongs to the northern domain of the Pan-African Range of Central Africa (CPAC). The aim of this work is to highlight the petrogenesis of the hypovolcanic formations affecting the Pan-African base and the Cretaceous sedimentary basins of the study area as well as their geodynamic context. Hypovolcanic formations have a strong affinity with rocks of the continental tholeiitic series. The tholeiitic character with alkaline affinity constitutes the transition between alkaline and tholeiitic magmatisms. The low Rb/Sr ratios (0.24 - 1.24) constitute proof that the dolerites studied do not come from the partial fusion of Pan-African granitoids (Rb/Sr: 2.54 - 7.64) but rather from a mantle source as shown by the similar ratios of Zr/Hf (37.56 - 43.08), Nb/Ta (15.16 - 19.60) of dolerites from the Pan-African basement (DSP) and Zr/Hf (34.34 - 46.48), Nb/Ta (14.34 - 19.3) from dolerites from the Cretaceous sedimentary basins (DBSC). The enrichment in LREE relative to the HREE of the dolerites studied associated with the ratios (Tb/Yb)N (1.95 - 2.56), Dy/Yb (2.33 - 2.85) characterizes a mantle source of lherzolite with garnet. %K Hypovolcanic Formations %K Geochemistry %K Continental Tholeiite %K Pan-African Basement %K Cretaceous Sedimentary Basin and Figuil-Lé %K ré %U http://www.scirp.org/journal/PaperInformation.aspx?PaperID=140987