UPb and SmN edvidence for Eburnian and Pan-African high-grade metamorphism in cratonic rocks of southern Cameroon

Toteu, S.F.; Schmus, W. R. Van; Pénaye, Joseph; Nyobe, J. B.

doi:10.1016/0301-9268(94)90014-0

Cited by 322 publications

(269 citation statements)

References 26 publications

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“…The Betare Oya area is part of the Neoproterozoic (700 -1100 Ma) volcano-sedimentary formations of Cameroon or schist belts referred to as the lower Lom series [5] [6]. These formations occur discordantly on the Pan-African basement made up of migmatites and granitic to ortho-gneissic and biotite rich rocks.…”

Section: Regional Geologymentioning

confidence: 99%

Characterization of Alluvial Gold Bearing Sediments of Betare Oya District-East Cameroon, Implication for Gold Exploration and Recovery

Mboudou¹,

Fozao²,

Njoh³

et al. 2017

OJG

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Field studies (location Au pits, sampling of different layers of sedimentary sequences filling the pits, panning of sediments), litho-stratigraphic investigations, grain size analysis and outlining of depositional conditions revealed a characteristic fining upward sequence in all the sections of 08 Au-pits within the Betare Oya basin. A typical profile is 2.5 to 4.5 m thick and is composed of a 30 to 50 cm organic topsoil layer, underlain by a 1.5 m thick reddish brownish gold free saprolite, which is underlain by 1.5 m sandy section. From litho-stratigraphic investigations and grain size analysis results a quartz dominated gravelly 1.4 m thick layer consisting in boulders (275 mm), cobbles (2-<20 mm) and subrounded pebbles (28 -38 mm) mixed with sand grains (0.9 -1.5 mm) and silt (0.01 -0.02 mm). Pyrite, chalcopyrite and arsenopyrite are minor minerals and could be referred as to Au pathfinders (As, Fe, Cu). This layer overlays paleo-Proterozoic basement rocks (Nyong series) and is overlain by a poorly sorted sandy layer containing rounded whitish quartz grains and plagioclase fractions (Ca, Na), minor silts (0.02 -0.2 mm), gravel and feldspar (K) leached from granitic plutons along shear zones in the area. The saprolite horizon overlaying the sandy layer derives from weathering and leaching of basement rocks under warm-humid climatic conditions. From gold grain count, the gravelly layer is the main productive horizon. Au is lithologically controlled and could be an important exploration factor in the study area. The calculated aspect ratios for pebbles from the gravelly and sandy layers disclosed two polynomial trends: 1) y = −0.0148x 2 + 1.2187x + 2.0344, R² = 0.6929 (sandy layer); 2) y = 0.0617x 2 + 1.0849x + 0.8097, R² = 0.8694 (gravelly layer); and y > R 2 is satisfied in both cases. This implies that Au recovery from these layers could be effective through gravity separation using sieves mounted on classifiers of 7 cm (sandy layer) and 10 cm (gravelly layer) diameter.

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Section: Regional Geologymentioning

confidence: 99%

Characterization of Alluvial Gold Bearing Sediments of Betare Oya District-East Cameroon, Implication for Gold Exploration and Recovery

Mboudou¹,

Fozao²,

Njoh³

et al. 2017

OJG

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“…This promontory would have obliterated the reverse limb of associated large scale recline fold and correlative metamorphic isograds as suggested by a recent study of the Boumyebel talcshist (Yonta-Ngoune et al, 2010). U-Pb ages of a syn-shear syenite yield ca 590 Ma (Toteu et al, 1994), that approximately date the wrench and thrust evolution in southern Cameroon.…”

Section: Fig 3 Fold Generations and Geometry In Northern Cameroon (mentioning

confidence: 87%

Plates Amalgamation and Plate Destruction, the Western Gondwana History

Ngako¹,

Njonfang²

2011

Tectonics

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Tectonics 4This study involves modern structural analysis and concepts (phase chronology, strain analysis, deformation and kinematics), petrology (metamorphic parageneses and phase equilibrium, relation with deformation, geothermobarometry), geochemistry (major and trace elements) and geochronology. Data from regional literature including geophysical data are also abundantly used for synthesis and re-interpretation. The most important achievements include: 1. A new tectonic model for the Pan-African/Brasiliano belts; this model includes many original aspects and developments with regards to the collisional setting, tectonics, metamorphic and magmatic processes. In particular, a three-plate model is proposed, and the role of the asthenosphere on crustal melting and reactivation during collision is emphasized. 2. Evidence of a tectonic indent in the central Nigeria-Cameroon domain, inferred from the regional strain field; indentation in central-west Africa strongly suggests that the East Saharan Block (ESB) evolved originally as a rigid prong prior to crustal melting, batholiths emplacement and subsequent dismantling of the prong during the late PanAfrican evolution. 3. Clear distinction between Pan-African and Post Pan-African tectonic and magmatic processes which raises the question on the relevance of integrating Phanerozoic lithospheric structures inferred from geophysical data (gravity, seismic tomography, etc.) in the interpretation and reconstruction of the Pan-African tectonic evolution. Future research would be focused on the Central Cameroon Shear Zone (CCSZ) kinematics and the characterization of vestiges of the dismantled SFCC/ESB cratons and hypothetic pre-tectonic boundaries.

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“…The Central African Belt is composed of 630 -540 Ma granitic plutons and subordinate amounts of schist, migmatitic gneiss and amphibolite (Boullier et al, 1986;Toteu, 1990;Soba et al, 1991;Toteu et al, 1994;Ferré et al, 1998). Peraluminous and high -K calc -alkaline granitoids (biotite granitoids) are the most widespread rocktypes in the Nkambe area, and they can be subdivided into foliated and massive groups (Fig.…”

Section: Geologic Outlinementioning

confidence: 99%

Emplacement P-T conditions of Pan-African biotite-amphibole granitoids in the Nkambe area, Cameroon

Tetsopgang¹,

Enami²,

Njonfang³

2011

Journal of Mineralogical and Petrological Sciences

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Biotite -and amphibole -bearing monzogranite, quartz monzonite, and tonalite intrude into the biotite granitoids and biotite -hornblende gneisses of the Pan -African belt in the Nkambe area, northwestern Cameroon. The common mineral assemblage in these rocks is amphibole + biotite + plagioclase + K -feldspar + quartz + zircon + apatite; however, their modal composition varies in each rock -type. Most amphibole grains are relatively homogeneous and locally have slightly Al -rich rims. They are mostly ferro -edenite or ferropargasite, and in a tonalite sample, there is magnesiohornblende with less aluminous and more magnesian composition. The amphibole + biotite + plagioclase + K -feldspar + quartz assemblage was affected by several pressure -sensitive and H 2 O -free reactions. The ferro -edenite -and/or ferropargasite -bearing samples show similar pressure -temperature (P -T) ranges of 0.46 -0.50 GPa/655 -690 °C and 0.43 -0.69 GPa/675 -705 °C. In contrast, the magnesiohornblendebearing tonalite records lower temperature conditions of 0.77 GPa/610 °C, which is attributed to subsolidus reequilibration during cooling. The P -T estimates for the biotite -amphibole granitoids in this and previous studies suggest that relatively high -pressure granitoids are widespread in the Nkambe area.

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UPb and SmN edvidence for Eburnian and Pan-African high-grade metamorphism in cratonic rocks of southern Cameroon

Cited by 322 publications

References 26 publications

Characterization of Alluvial Gold Bearing Sediments of Betare Oya District-East Cameroon, Implication for Gold Exploration and Recovery

Characterization of Alluvial Gold Bearing Sediments of Betare Oya District-East Cameroon, Implication for Gold Exploration and Recovery

Plates Amalgamation and Plate Destruction, the Western Gondwana History

Emplacement P-T conditions of Pan-African biotite-amphibole granitoids in the Nkambe area, Cameroon

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