Research Article

Emplacement and Evolution of The Nlonako Ring Complex in The Southern Domain of The Cameroon Line

Noudiedie Kamgang Julie Agathe
University of Dschang, Cameroon
Tcheumenak Kouémo Jules
University of Douala, Cameroon
* Corresponding author
Kagou Dongmo Armand
University of Dschang, Cameroon
Fozing Éric Martial
University of Dschang, Cameroon
Choumélé Kana Styve Cliff
University of Dschang, Cameroon
Efon Awoum Julios
University of Dschang, Cameroon
Kenfack Nguemo Gatien Romuald
University of Dschang, Cameroon
DOI icon 10.24018/ejgeo.2020.1.4.45

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Submitted 2020-07-13
Published 2020-08-08

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Article Main Content

The Cameroon Line (CL) appears as a SW-NE straight line characterized by an intense volcanic activity of basaltic composition with alkaline plutonic complexes, including the Nlonako ring complex (NRC) emplaced in the southern part of the CL. Many hypotheses have been proposed to explain the origin and petrogenetic evolution of these complexes but very few of these works focus or attempt to propose their structural emplacement model, though structural data recorded by them can permit such studies. Using petrographic, structural data and space images, we propose an emplacement model of the NRC and other ring complexes along the CL. The NRC is a ring complex of 10 km diameter slightly elongated in the NNE-SSW direction mainly composed of plutonites among which syenites, gabbros, diorites and biotite-amphibole granites, and a few volcanites made up of rhyolites and basalts occurring as veins or boulders in syenites. This complex was emplaced as sill intrusive body within Pan-African k-feldspars megacrysts granites and gneiss host rocks under fractures control. These fractures developed as result of stress release consecutive to the readjustment of the crust during and after the late Cretaceous general extension, therefore facilitating the upwelling of the mantle plume and the generation of magma that vertically uplift. The progressive magmatic pressure decreases after the NRC emplacement in addition to conjugated fractures networks developed at superficial crust level finally lead to the cauldron subsidence of the NRC summit. This subsidence was facilitated by the downward sliding of rocks along the WNW-ESE fault, finally leading to the formation of a caldera at the summit of the NRC. The NRC and other anorogenic complexes aligned along the CL are located in a tension gash form by the Cretaceous sinistral activation of the N70E Adamawa fault. This left lateral wrench movements developed a tension gash, overprinted on pre-existing transcurrent mega-faults with as result, the development of "en-echelon" fractures. Stress release during the late Cretaceous general extensional phase probably accelerated the uplift of magmas and emplacement of ring complexes along the "en-echelon" regional fractures in an extensional setting during the Tertiary (60 - 30 Ma). This therefore explained the alignment of anorogenic complexes along the N30E CL corridor that are highly correlated to lineament networks and Pan-African megafaults

Keywords: Nlonako ring complex, Caldera, Tertiary ring complexes, Transcurrent faults, Cameroon Line

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