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首页> 外文期刊>Journal of Geosciences and Geomatics >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)
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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)

机译：Mbé-Sassa-Bersi地区的多相变形：对该地区的构造岩浆史以及Tcholliré-Banyo和喀麦隆中部剪切带（喀麦隆中部）的构造演化的影响

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Field petrographic and structural data of the Mbé-Sassa-Bersi area exposed two main group of rock (metamorphics and plutonics) which were affected by polyphase deformation. The structural evolution is marked by four deformation phases called D1, D2, D3 and D4. The geometrical arrangement of D1 structures (flat-lying foliation, horizontal lineation, recumbent folds and overlapping) allow to linked this deformation phase to tectonic nappe verging toward SSE. The second deformation stage (D2) corresponds to simple shear dominated transpression and characterized by the evolution of the Tcholliré-Banyo shear zone (TBSZ) that showing sinistral movement. The third deformation phase (D3), is marked by strain partitioning induced by transpression and links to the evolution of the Central Cameroon shear zone (CCSZ) that displays dextral motion. D1, D2 and D3 are associated to migmatization, development and emplacement of granitic magmatism. During D2 and D3, the magmatic rocks are emplaced under the control of the two main crustal shear zones (TBSZ and CCSZ). D4 deformation is responsible for the development of faults, fracture and joints and corresponds to brittle tectonic. The main NW-SE direction of faults and fractures suggest that D4 stage shows traces of the Benue trough. On the whole, Nappe tectonic, followed by transpressive tectonic are the main tectonic type developed during the Pan-African Orogeny in Central North Cameroon.
机译：Mbé-Sassa-Bersi地区的现场岩石学和结构数据暴露了受多相变形影响的两组主要岩石（变质岩和岩体）。结构演变的特征是四个变形阶段，分别称为D1，D2，D3和D4。 D1结构的几何排列（平坦的叶状，水平线形，斜折和重叠）使该变形阶段与构造冲动联系在一起，并朝SSE过渡。第二变形阶段（D2）对应于简单剪切为主的压转，其特征在于Tcholliré-Banyo剪切带（TBSZ）的演化，显示了左旋运动。第三变形阶段（D3）的特征是压转引起的应变分配，并与显示右旋运动的喀麦隆中央剪切带（CCSZ）的演化有关。 D1，D2和D3与花岗岩浆岩的迁移，发育和沉积有关。在D2和D3期间，在两个主要地壳剪切带（TBSZ和CCSZ）的控制下放置了岩浆岩。 D4变形负责断层，裂缝和关节的发育，并对应于脆性构造。 NW-SE断裂和裂缝的主要方向表明，D4阶段显示了贝努瓦谷的痕迹。总体而言，纳佩构造，其次是超压构造是喀麦隆中北部泛非造山运动期间形成的主要构造类型。

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