Geochemistry of the Bafoussam Pan-African I- and S-type granitoids in western Cameroon

Djouka-Fonkwé, Merline Laure; Schulz, Bernhard; Schüssler, Ulrich; Tchouankoue, Jean Pierre; Nzolang, Charles

doi:10.1016/j.jafrearsci.2007.09.015

Cited by 102 publications

(50 citation statements)

References 54 publications

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“…These large NE-striking transcurrent faults, as well as the Adamaoua fault inside the central domain, are regarded as possible prolongations of the major shear zones of NE Brazil in a pre-drift Gondwana reconstruction [20]. This central domain consists of archean to paleoproterozoic high-grade gneisses intruded by widespread Neoproterozoic syntectonic plutonic rocks of high-K calc-alkaline affinities [13,14,17,[21][22][23][24][25][26];…”

Section: Lithologic Contextmentioning

confidence: 99%

Geophysical and Geotechnical Investigations of a Landslide in Kekem Area, Western Cameroon

Epada¹,

Ganno²,

Tabod³

2012

IJG

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Geophysical and geotechnical surveys were conducted in the Western Cameroon (Kekem area) following a landslide on argillaceous material in order to understand the triggering processes and mechanisms of this landslide and to assess the stability of the slope. The geophysical soundings consisting of vertical electrical soundings with the Schlumberger electrode array configuration were carried out to monitor the behaviour of electrical resistivity in the landslide. Geoelectrical data showed a zone of low resistivity values identified as a clayey sand-filled aquifer. This aquifer played an important role in the triggering process of the landslide. Geotechnical soundings showed that the aquifer had a thickness of 7.0 m. The depth from the landslide crest level to the failure surface reached 3.0 m and 20.6 m. Laboratory tests were then carried out in order to evaluate the cohesion of the soil and the angle of internal friction, and to calculate the safety factor in view of making a stability analysis. The laboratory results exhibited a soil with low consistency, almost doughy. The mean value of the safety factor (1.4) been lower than the slope stability coefficient (1.5), revealed that the slope is unstable, likely to know at any moment a reactivation of the slide. This study showed that electrical soundings coupled with geotechnical surveys are useful tools for the characterization of landslides.

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Section: Lithologic Contextmentioning

confidence: 99%

Geophysical and Geotechnical Investigations of a Landslide in Kekem Area, Western Cameroon

Epada¹,

Ganno²,

Tabod³

2012

IJG

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“…These large, NEstriking transcurent faults, as well as the Adamaoua fault inside the central domain, are regarded as possible prolongations of the major shear zones of NE Brazil in a predrift Gondwana reconstruction [18]. This central domain consists of an assembly of fragments of Paleoproterozoic continental crust recrystallized under high-grade granulite facies (850-900°C, 1-1.2 GPa) at ca 2100 Ma [11,12,19] intruded by widespread Neoproterozoic syntectonic plutonic rocks of high-K, calc-alkaline affinities [7,9,[20][21][22][23][24][25][26]. The study area belongs to the eastern central part of the central domain ( Fig.…”

Section: Regional Geological Settingmentioning

confidence: 99%

Geochemistry of Ferriferous, High-K Calc-Alkaline Granitoids from the Banefo-Mvoutsaha Massif (NE Bafoussam), Central Domain of the Pan- African Fold Belt, Cameroon~!2009-11-12~!2010-01-05~!2010-03-11~!

Nono¹,

Nzenti²,

Suh³

et al. 2010

TOGEOJ

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Abstract:The ferriferous high-K calc-alkaline rocks of the Banefo-Mvoutsaha Massif, Pan-African Belt, Central Cameroon, were synkinematically emplaced in a sinistral strike-slip shear zone of Pan-African age. The rock sequences consist of orthogneises made of coarse-grained granites, quartz-monzonites, and medium-to fine-grained granodiorites, ranging from ca. 55 to 75 wt.-% SiO 2 . They display characteristics of shoshonitic and high-K calc-alkaline series. Orthogneises are metaluminous to peraluminous and show characteristics of I-type granitoids from a ferriferous series. Trace element distribution patterns reveal rocks enriched in LILE when compared to HSFE and distinctively depleted in Th, Nb, Ba, Sr, Ti and Ta. The data indicate that this granitic rock assemblage did not result from the simple differentiation of a common parental magma, but show that Banefo-Mvoutsaha plutonic rocks were derived from different crustal protoliths. Major and trace element composition are consistent with the magmatism which may have involved remelting of (1) a composite metagreywackes protolith in the upper crust and (2) amphibolitised high-K calc-alkaline basaltic andesites in the central domain of the PANEFB (Pan-African North Equatorial Fold Belt). The plutonic rocks of Banefo-Mvoutsaha area resemble other Neoproterozoic high-K calc-alkaline syntectonic plutons in Western Cameroon. They also display strong similarities with high-K calc-alkaline plutons of the Pernambuco shear zone in NE Brazil and Eastern Nigeria.

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“…Plutonic rocks in Bayon area in the southwestern part of the Cameroon orogenic belt havenot yet been investigated in detail. In this paper we reportthe geochemistry of the Bayon plutonic complex, 1990; Tchouankoue, 1992;Nguiessi et al,1994;Nzolang et al, 2003;Djouka Fonkwe et al, 2008;Njiekak et al, 2008;Tchaptchet Tchato et al, 2009). The WCSG is also affected by the Central Cameroon Shear Zone (Ngako et al, 2003;Njonfang et al, 2008;Njanko et al, 2010;Kwekam et al, 2010) The emplacement of the Bayon plutonic complex like other granitoids in West Cameroon was controlled not only by a N30°E strike-slip shear zone, forming a prolongation of the Cameroon Volcanic Line, but also by the N70°E central Cameroon shear zone.…”

Section: Introductionmentioning

confidence: 91%

“…This fold belt is associated with the Pan-African tectonothermalevent 650-500 Ma and is related to the collision of the Congo Craton with the West African Craton (Fig.1a). That collision structured the Pan-African North Equatorial belt which extends in Sudan, Central African Republic, Cameroon and through correlations with North-East Brazil (Castaing et al, 1994;Nzenti et al, 1998;Toteu et al,2001;Abdelsalam et al, 2002;Oliveira et al, 2006).In West Cameroon, Pan-African massifsare widely distributed (Fig.1b) andare described as syn to post-collisional, calc-alkaline, ferro-potassic and metaluminous (Tchouankoue, 1992;Nguiessi et al,1997;Tagne -Kamga, 2003;Nzolang et al, 2003;Tetsopgang, 2003;Djouka Fonkwe et al, 2008).According to available ages, the massifswere emplaced during the Pan -African D2 deformation event. The emplacement age (Rb -Sr whole rock and Th -U -Pb methods) are between 720-540 Ma (Toteu et al, 1990;Tchouankoue, 1992;Nguiessi et al, 1997;Tagne -Kamga, 2003;Nzolang et al, 2003;Tetsopgang, 2003;Djouka Fonkwe et al, 2008;Njiekak et al, 2008., Tchaptchet Tchato et al, 2009Kwekam et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Geochemistry of the Bayonplutonic Complex – Western Cameroon

Belnoun¹,

Tchouankoue²,

Itiga³

et al. 2013

Glo Jnl Geo Sci

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The BayonNeoproterozoic plutonic complex located in Western Cameroon intrudes gneisses of Paleo to Neo Proterozoic age. The complex is composed of gabbro, monzogabbro and monzonites frequently crosscut by trachytic and granitic veins. /Lu N = 14 -27) with none or negligible Eu anomalies. The monzonite shows also moderate fractionatedpatterns (La N /Lu N = 20 -27) with fairly positive Eu anomalies. All the studied rocks show flat HREE features. The primitive mantle-normalized element patterns are almost homogeneous with negative anomalie in Ta, Nb, Th, P and Ti. Sm/Nd-wr-Cpx-Pl ages of the complex are 580 ± 13 Ma; 553 ± 32 Ma for the monzogabbro and 547 ± 26 Ma for the monzonite. The Nd/Sr isotopic compositions show that the Bayon plutonic rocks were generated by partial melting of subcontinental lithospheric mantle. The depleted mantle Nd model age TD M of 1.6 -1.7 Ga indicates that the studied rocks originated by partial melting of Mesoproterozoic mantle.

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Geochemistry of the Bafoussam Pan-African I- and S-type granitoids in western Cameroon

Cited by 102 publications

References 54 publications

Geophysical and Geotechnical Investigations of a Landslide in Kekem Area, Western Cameroon

Geophysical and Geotechnical Investigations of a Landslide in Kekem Area, Western Cameroon

Geochemistry of Ferriferous, High-K Calc-Alkaline Granitoids from the Banefo-Mvoutsaha Massif (NE Bafoussam), Central Domain of the Pan- African Fold Belt, Cameroon~!2009-11-12~!2010-01-05~!2010-03-11~!

Geochemistry of the Bayonplutonic Complex – Western Cameroon

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