Petrography and Geochemistry of Precambrian Basement Straddling the Cameroon-Chad Border: The Touboro Ba&amp;#239;bokoum Area

Seguem, Naimou; Alexandre, Ganwa Alembert; Klötzli, Urs; Kepnamou, Amadou Diguim; Emmanuel, Ekodeck Georges

doi:10.4236/ijg.2014.54040

Cited by 10 publications

(3 citation statements)

References 28 publications

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“…It is not unlikely that amphibole-biotite granite of Doua and pyroxene-amphibole-biotie granite of Meiganga are contemporaineous of the D3 deformational phase as mentioned by [1]. Contrary to the pyroxene-amphibolebiotite granite of Meiganga and Baibokoum with pyroxene, the amphibole-biotite granite under study has no pyroxene; it is important to note that the presence of pyroxene in such granite has been interpreted as xenocryst of the metamorphic basement [1,13]. One can deduce that the mineralogy hosted rock in the Doua area has no pyroxene.…”

Section: Discussionmentioning

confidence: 88%

The Pan-African Biotite-Muscovite Granite and Amphibole-Biotite Granite of Doua (Central Cameroon): Zircon Features, LA-MC-ICP-MS U-Pb Dating and Implication on Their Tectonic Setting

Kepnamou¹,

Alexandre²,

Klötzli³

et al. 2017

JGG

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The Doua area belongs to the Adamawa-Yadé domain (AYD) of the Central African Fold Belt (CAFB) in Cameroon. It is crossed by the Central Cameroonian Shear Zone (CCSZ). The purpose of this research is to determine the tectonic setting of granites of the studied area, based on their petrography, zircons feature and their ages. Petrographicaly, the Doua area is made up of plutonic rocks hosted in an ortho or paraderivative metamorphic basement. Amphibole-biotite granite (ABG) and biotite-muscovite granite form hills and crop out on the hill side, as flagstones in the valley or river bed, and as huge blocks. Amphibole-biotite granite is granular in texture and made up of amphibole, biotite, feldspar, accessory minerals (Sphene, zircon, and apatite) and secondary minerals (sericite). Biotite-muscovite granite (BMG) is granular to granular porphyritic in texture, made up of biotite, muscovite, plagioclase, K-feldspar, quartz, accessory minerals (zircon, opaques minerals) and secondary minerals (chlorite, sericite). ABG show elongated zircon grains with well-developed magmatic oscillatory zonation. LA-ICP-MS U-Pb data from these zircons define a concordia age of 607 ± 3 Ma and considered as crystallization age of the granite. BMG shows zircon with various shape and various internal structures (oscillatory zonation, sector zonation, blurred oscillatory zonation …) which are divided into two sets. The first set regarded as xenocryst from Paleoproterozoic granitoids emplaced at 2126 ±36 Ma or from sediments which detritus comes from such granitoids. The second set of zircons shows effects of recent lead lost and a subconcordant U-Pb age of 646 ± 39 Ma . ABG was emplaced during the D3 deformational phase, date at 607 ± 3 Ma , while BMG was trigger because of syn-D1 activity of the CCSZ at 647 ±46 Ma in association with the collisional process.

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Section: Discussionmentioning

confidence: 88%

The Pan-African Biotite-Muscovite Granite and Amphibole-Biotite Granite of Doua (Central Cameroon): Zircon Features, LA-MC-ICP-MS U-Pb Dating and Implication on Their Tectonic Setting

Kepnamou¹,

Alexandre²,

Klötzli³

et al. 2017

JGG

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“…The Eu negative anomalies common to all samples has to do with its divalent. The correlation of the multi-element spectra of GGS with the granitoids of Tcholliré (Negue et al 2015), of Meiganga on the Adamawa plateau (Ganwa et al 2011) and their extension in Central African Republic (Naïmou et al 2014) is positive. This similarity is based on their positive anomalies in K-Nb-Ta-Ti, which is one more argument to the tectono-magmatism of GGS (Fig.…”

Section: Discussionmentioning

confidence: 93%

Geochemistry of Garga-Sarali intrusive granitoids (central domain of the central African fold belt in Cameroon): petrological implication

Daama

Bertrand

Fadimatou

et al. 2020

IJAG

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The Garga-Sarali granitoids outcrop in form of large slabs and undistorted large blocks, into a schisto-gneissic basement. These rocks contain mainly muscovite and microcline, followed by K-feldspar, quartz, biotite, pyroxene, zircon and oxides, with coarse-grained to fine-grained textures. Geochemical analysis show that it belongs to differentiated rocks group (granodiorite-granite) with high SiO2 (up to 72 wt%) contents. Their genesis was made from a process of partial melting and fractional crystallization. These rocks are classified as belonging to I- and S-Type, meta-peraluminous, shoshonitic granites; belonging to the domain of volcanic arcs. The rare earth elements patterns suggest a source enriched of incompatible elements. The Nb-Ta and Ti negative anomalies from the multi-element patterns are characteristics of the subduction domains.

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“…18.aThe disparity of the samples around the decreasing bilinear (τ) would suggest a re-equilibration of these minerals with residual magmatic fluid. Their high content of heavy rare earths(Daama et al, 2020) could be due to the presence of this fluid at the time of crystallisation, which would have led to vein pockets in the cordierite-bearing pegmatites.…”

mentioning

confidence: 99%

Petrogenesis of metaluminous and peraluminous granitoids from Garga-Sarali zone : evidence of I- and S-type sources (central African fold belt in Cameroon)

Isaac,

Gbambie Isaac Bertrand,

Dagwaï

et al. 2024

IJAG

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The Garga-Sarali granitoids outcrop from a metamorphic basement in the central-eastern part of the Central Cameroonian Domain of the Central African fold belt in Cameroon, and are petrographically very complex. They can be divided into two types : (1) Granodiorites of metaluminous type-I, with a fine-grained porphyritic variant texture, consisting of quartrz + orthoclase + microcline + plagioclase + biotite + zircon + oxides ± apatite; (2) and two-mica granites of hyper-aluminous type-S, with a grainy texture, consisting of the same quartzo + k-feldspars + biotite + cordierite ± apatite. These formations both belong to a calc-alkaline-subalkaline, hyper-potassic to shoshonitic signature, and to the tectonic domains of volcanic arc granites. Their emplacement is intimately linked to a crustal parent magma (metagrauwackes and metabsalt-tonalites) that imbibed through the openings in the post-orogenic pan-African lithospheric constraints. Their La/Yb ratio, with (La/Sm)n ranging from 2.18-5.75 ppm, reflects their richness in LREE, and the average Eu/Eu*=0.666 ppm suggests that the residual magma was supersaturated with silica.

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Petrography and Geochemistry of Precambrian Basement Straddling the Cameroon-Chad Border: The Touboro Baïbokoum Area

Cited by 10 publications

References 28 publications

The Pan-African Biotite-Muscovite Granite and Amphibole-Biotite Granite of Doua (Central Cameroon): Zircon Features, LA-MC-ICP-MS U-Pb Dating and Implication on Their Tectonic Setting

The Pan-African Biotite-Muscovite Granite and Amphibole-Biotite Granite of Doua (Central Cameroon): Zircon Features, LA-MC-ICP-MS U-Pb Dating and Implication on Their Tectonic Setting

Geochemistry of Garga-Sarali intrusive granitoids (central domain of the central African fold belt in Cameroon): petrological implication

Petrogenesis of metaluminous and peraluminous granitoids from Garga-Sarali zone : evidence of I- and S-type sources (central African fold belt in Cameroon)

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