eng Science and Education Publishing Journal of Geosciences and Geomatics 2373-6704 2022-05-08 10 2 81 88 10.12691/jgg-10-2-2 JGG20221022 article Mana Bouba Christian manaboubachristian@yahoo.com 1 2 Isma?la Ahmadou 2 2 Ipan Antoinette Solange 2 3 4 Issac Bertrand Gbambie Mbowou 5 Yingyang Wanbitching Raoul 5 Sep Nlonngan Jean Paul 5 Dili-Rake Jacques 6 Bomolomo Michel Vanessa 6 7 Safianou Ousmanou 8 Bello Bienvenue 8 Centre for Geological and Mining Research, P.O Box 333, Garoua, Cameroon, (Institue of Geological and Mining Research, Cameroon) School of Geology and Mining of Meiganga (EGEM), University of Ngaoundere, Cameroon Research Centrer for Geophysics and Volcanology, P.O Box 370 Buea, (Institue of Geological and Mining Research, Cameroon) Laboratory of Environmental Geology, University of Dschang P.O Box 67, Dschang Cameroon A petrographic and a structural study of the Gounbela region (Adamawa-Yadé) basement have been made. This included a macroscopic and a microscopic approach. The lithology is made up of biotite-amphibole gneisses and amphibolites (belonging to the amphibolite facies); of biotite-muscovite and pink granites with a porphiryc granular texture showing a syn-to late tectonic character of rocks. The Gounbela tectonic present four deformational phases; D1, D2, D3, D4. D1 is materialized by the S1 foliation; D2 is marked by the S2 schistosity resulting from the tranposition of S1 foliation. D3 is charasterized by F3 folds and C3 shear planes. The D4 deformational phase is made up of veins and faults. The major faults directions N130-N140 are similar to those belonging to the Lamé cretaceous Serie in Tchad, suggesting that they may have been occurred during the Atlantic opening. http://pubs.sciepub.com/jgg/10/2/2/jgg-10-2-2.pdf Gounbela Adamawa-Yad¨¦ Amphibolites facies plutonic rocks deformational phases