Figure 4. Structures of D₂ deformation phase at Mbé – Sasa-Mbersi area. (a) S₂ foliation carrying the mineral and stretching lineation marked by amphibole and plagioclase alignment (Ndom locality); (b) similar fold F₂ in the amphibolites of Mbé. The hinges and flanks of these folds described the crenulation schistosity (AP = axial plane); (c) isopach fold in the Mayo Lou river around the Ndong Benoue locality; (d) pegmatite vein concordant to the S₂ and folded in form of compressed « S » with sinistral movement and N50E orientation in the amphibolites of Mayo Lou; (e) dissymmetric sheath fold F₂ in the Karna carry; (f) discontinuous and folded pegmatite (ptygmatitic and rootless folds) in the altered amphibolites of the tourer trench of Ngaoundéré scarp; (g) sinistral syn-shearing quartzo-felspathic vein folded, podgy and moved the S_0-1 foliation at the Karna carry; (h) perturbation  zone: dextral rotation veins shearing C₂ in C₃ during the D₃ at Ndong Benoue. These veins are in pinch-and-swell boudin form; (j) pinch-and-swell quartzo-feldspathic vein in a F₂ fold in the amphibolites at Ndong Bénoué; (i) quartzo-feldspathic boudins with length tail of crystallisation in the amphibolites of Ndong Bénoué

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Polyphase deformation in the Mbé - Sassa-Bersi area: Implications on the tectono-magmatic history of the area and the tectonic evolution of the Tcholliré-Banyo and Central Cameroon Shear Zones (Central North Cameroon)

Saha Fouotsa Alliance Nicaise, Tchameni Rigobert, Nomo Negue Emmanuel, Daouda Dawaï, Penaye Joseph, Fosso Tchunte Periclex Martial

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