A new tectonic model for the Cameroon Line, Central Africa

Moreau, Christian; Regnoult, Jean Marc; Dennielou, Bernard; Robineau, Bernard

doi:10.1016/0040-1951(87)90206-x

Cited by 205 publications

(153 citation statements)

References 18 publications

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“…Il est intensément découpé par un faisceau d'accidents majeurs (Moreau et al, 1987). Une distension subméridienne au Cénozoïque est à l'origine de la surrection du horst de l'Adamaoua et de l'effondrement du fossé de Djérem et de Mbéré (Ngangom, 1983), surrection qui a engendré une large anomalie de Bouger (-80 à -100 mgl et -120 mgl/cm) (Brown et Fairhead, 1983;Poudjom Djomani, 1995 ;Okereke, 1988).…”

Section: Cadre Géologiqueunclassified

“…La croûte continentale sous le plateau est mince (23 km, Poudjom Djomani, 1995) au nord et surmonte un manteau anormalement chaud (Dorbath et al, 1986) caractérisé par une faible vitesse de propagation des ondes "P" (7,8 km/s) par rapport au sud où elle est normale (33 km et 8,0 km/s) (Dorbath et al, 1984;Stuart et al, 1985). La mise en place du volcanisme est vraisemblablement liée à des fractures panafricaines (Cornacchia et Dars, 1983;Moreau et al, 1987). Au sud de Ngaoundéré, des cônes de pyroclastites sont présents avec parfois des lacs de cratère.…”

Section: Cadre Géologiqueunclassified

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Géochimie des laves basaltiques récentes des zones Nord et Est de Ngaoundéré (Cameroun, Plateau de l’Adamaoua, Afrique centrale): pétrogenèse et nature de la source

Nkouandou¹,

Ngounouno²,

Dennielou³

2011

International Journal of Biological and Chemical Sciences

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Section: Cadre Géologiqueunclassified

Géochimie des laves basaltiques récentes des zones Nord et Est de Ngaoundéré (Cameroun, Plateau de l’Adamaoua, Afrique centrale): pétrogenèse et nature de la source

Nkouandou¹,

Ngounouno²,

Dennielou³

2011

International Journal of Biological and Chemical Sciences

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“…These two major directions of the dykes fit into a Riedel fracture model [27] with E-W or N-S as the two sets of conjugate shear directions corresponding in a simple shear model to a direction of compression around 40° and extension at ca. 100°.…”

Section: Discussionmentioning

confidence: 99%

Petrology, Geochemistry, and Geodynamic Implications of Basaltic Dyke Swarms from the Southern Continental Part of the Cameroon Volcanic Line, Central Africa

Tchouankoue¹

2012

TOGEOJ

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Basaltic dyke swarms in the southern continental part of the Cameroon Volcanic Line (Bangangte, Dschang, Manjo areas) are tholeiitic in composition with 46 to 50 wt.% SiO 2 and have moderate Mg-numbers (53-59), medium TiO 2 contents (1.48-2,05 wt.%), and flat to mildly enriched incompatible trace element patterns. Comparison with trace element patterns of representative Cenozoic basaltic rocks of the Cameroon Volcanic Line (Bana anorogenic complex, Mt. Bambouto, Adamawa Plateau basalts) indicates that these dykes are less enriched in light REE and show different incompatible trace element ratios (La/Yb: 5.7 to 8.6; Zr/Nb: 7.6 to 12.0; Ba/Th: 87.7 to 93.3). The trace element patterns of the dykes and their Sr-and Nd-isotope compositions, however, are similar to those of the pre-Cenozoic volcanic rocks of the Benue Trough in Nigeria. Our data therefore suggest that these dykes represent the magmatic history related to the break-up of Africa and South America and are unrelated to the Tertiary volcanism of the Cameroon Line.

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“…Basalts are seen as enormous flows in the central southern part of the Basin. Alternating Cretaceous sandstone-shale Formations of the Mamfe basin are slightly folded and locally affected by very low-grade metamorphism (Moreau et al, 1987).…”

Section: Geologic and Tectonic Settingmentioning

confidence: 99%

Geometrical Characterisation of the Mamfe Basin, Cameroon, from the Earth, Gravitational Model (EGM 2008)

Lordon¹,

Yossa²,

Agyingi³

et al. 2018

ESR

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Gravimetric studies using the ETOPO1-corrected high resolution satellite-based EGM2008 gravity data was used to define the surface extent, depth to basement and shape of the Mamfe basin. The Bouguer anomaly map was produced in Surfer 11.0. The Fast Fourier Transformed data was analyzed by spectral analysis to remove the effect of the regional bodies in the study area. The residual anomaly map obtained was compared with the known geology of the study area, and this showed that the gravity highs correspond to the metamorphic and igneous rocks while the gravity lows match with Cretaceous sediments. Three profiles were drawn on the residual anomaly map along which 2D models of the Mamfe basin were drawn. The modeling was completed in Grav2dc v2.06 software which uses the Talwini's algorithm and the resulting models gave the depth to basement and the shape of the basement along the profiles. After processing and interpretation, it was deduced that the Mamfe basin has an average length and width of 77.6 km and 29.2 km respectively, an average depth to basement of 5 km and an overall U-shape basement. These dimensions (especially the depth) theoretically create the depth and temperature conditions for petroleum generation.

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A new tectonic model for the Cameroon Line, Central Africa

Cited by 205 publications

References 18 publications

Géochimie des laves basaltiques récentes des zones Nord et Est de Ngaoundéré (Cameroun, Plateau de l’Adamaoua, Afrique centrale): pétrogenèse et nature de la source

Géochimie des laves basaltiques récentes des zones Nord et Est de Ngaoundéré (Cameroun, Plateau de l’Adamaoua, Afrique centrale): pétrogenèse et nature de la source

Petrology, Geochemistry, and Geodynamic Implications of Basaltic Dyke Swarms from the Southern Continental Part of the Cameroon Volcanic Line, Central Africa

Geometrical Characterisation of the Mamfe Basin, Cameroon, from the Earth, Gravitational Model (EGM 2008)

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