Journal of Geosciences and Geomatics
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Journal of Geosciences and Geomatics. 2018, 6(2), 41-54
DOI: 10.12691/jgg-6-2-2
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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 Nicaise1, , Tchameni Rigobert1, Nomo Negue Emmanuel2, Daouda Dawaï3, Penaye Joseph4 and Fosso Tchunte Periclex Martial1

1Department of Earth Sciences, Faculty of Science, University of Ngaoundéré P.O. box 454 Ngaoundéré, Cameroon

2Department of Earth Sciences, Faculty of Science, University of Yaoundé I, P.O. box 812 Yaoundé, Cameroon

3Department of Earth Sciences, Faculty of Sciences, University of Maroua, P.O. Box 55, Maroua, Cameroon

4Centre de Recherches Géologiques et Minières (CRGM) de Garoua, P.O. Box 333 Garoua, Cameroun

Pub. Date: June 28, 2018

Cite this paper:
Saha Fouotsa Alliance Nicaise, Tchameni Rigobert, Nomo Negue Emmanuel, Daouda Dawaï, Penaye Joseph and Fosso Tchunte Periclex Martial. 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). Journal of Geosciences and Geomatics. 2018; 6(2):41-54. doi: 10.12691/jgg-6-2-2

Abstract

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.

Keywords:
Central African orogenic belt central Cameroun domain shear zone nappe tectonic transpression strain portioning

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