Petrology and geochronology of felsic volcanics in the Sabga area (Bamenda Highlands): implications for age variation along the Cameroon Volcanic Line

Tibang, Edith Etakah Bate; Suh, Cheo Emmanuel; Cottle, John M.; Ateh, Kevin Ijunghi; Tiabou, Anicet Feudjio; Nche, Linus Anye; Bih, Vivian; Vishiti, Akumbom

doi:10.3190/jgeosci.247

Cited by 4 publications

(6 citation statements)

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“…The CVL is a near 1700 km, SW-NE trending, African intraplate "fan shaped", alkaline volcano-plutonic rift zone of variable width (<200 km), with a ca. 66 Ma history of magmatic activity without any systematic internal pattern of age variation [20]- [25]. The CVL structure is a consequence of a series of parallel fissures oriented N30˚E and some transversal events [26].…”

Section: Geologic Settingmentioning

confidence: 99%

“…Bambouto to the South-west and the Oku Massifs in the North-east, all being volcanoes along the central part of the continental sector of the CVL. It is inferred to be underlain by older Paleoproterozoic and Pan-African metagranitic basements [25] [27] [28] which is covered by sequences of alternating felsic and mafic units [25] [29].…”

Section: Geologic Settingmentioning

confidence: 99%

“…The felsic lavas are more abundant than their mafic counterparts and are comprised dominantly of rhyolitic lava flows, trachytic, dacitic and rhyodacitic flows as well as welded ignimbrites. The mafic units are mainly alkalis basalts, hawaiites and basanites [25]- [32]. The rhyolitic ignimbrites consist of welded and non-welded massive lapilli tuff and lithic breccias [33].…”

Section: Geologic Settingmentioning

confidence: 99%

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Mineralogy and Texture of the Weathered Products from Silicic Lavas in the Sabga Area, North West Cameroon

Tibang¹,

Waji²,

Shemang³

et al. 2021

IJG

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Products of weathering usually clay minerals, are commonly characterized through mineralogical, chemical and geochemical analysis, emphasizing their implications in industrial applications, initiation of landslides and their impact on surface water geochemistry. In this study the vertical variations in textural characteristics and clay mineral type within weathered profiles in the Sabga area were investigated. Two exposed weathered profiles were logged from bed rock to topsoil and each horizon was sampled separately. Granulometric analysis on the samples indicated mixtures of clay, silt and sand size particles in all horizons. Smectite and kaolinite were identified by X-ray diffractometry (XRD) and scanning electron microscopy (SEM). The two logs show that the lower horizons display whitish colors with fine laminations, middle horizons are brownish and the upper horizons display dark brown colors. Graphic mean values for both sections gave values that range between 2.02 -3.7φ with an average standard deviation value of 1.9φ, indicating that the grains are poorly sorted sand, silt and clay. SEM micrographs show laths of smectite in the lower horizons, flakes of kaolinite and laths of smectites in the middle horizons while the upper horizons show flakes of kaolinite with microlites of quartz + feldspars. XRD patterns show broad basal reflections for kaolinite at 2θ 36.8˚ (3.15 Å), smectite at 2θ 33.5˚ (3.34 Å), both contaminated with quartz at 2θ 36.5˚ (3.32 Å) typical for these minerals.

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Section: Geologic Settingmentioning

confidence: 99%

Section: Geologic Settingmentioning

confidence: 99%

Section: Geologic Settingmentioning

confidence: 99%

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Mineralogy and Texture of the Weathered Products from Silicic Lavas in the Sabga Area, North West Cameroon

Tibang¹,

Waji²,

Shemang³

et al. 2021

IJG

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“…Mt. Oku is one of the main volcanic massifs along the Cameroon Volcanic Line (CVL) and sits on a basement of Pan-African granite-gneisses (~ 600 Ma), migmatites and biotite diorites (Njilah et al 2007;Bate Tibang et al 2017;Fig. 1a).…”

Section: Geological Setting Of Study Areamentioning

confidence: 99%

Gemstones-bearing sediments in the Mbiame floodplain, northwestern Cameroon

Etutu

Suh

Vishiti

et al. 2020

J. Sediment. Environ.

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Sediment samples obtained from pits in the Mbiame floodplain gemstone prospect in the northwestern part of Cameroon were studied for their bulk geochemical properties together with the mineral composition of the gemstones found therein to decipher their provenance. Five main layers were isolated in each pit comprising an organic rich humus layer, muddy layer, unconsolidated and poorly sorted sandy layer, clay layer and gravel layer. The gravel layer is the most high-yielding in terms of gemstones content. The sediments have high rare earth element (REE) concentrations varying between 135 and 456 ppm with variable light/heavy rare earth element (LREE/HREE) ratio values (5.8-21.5). REE chondrite normalized patterns show similar high LREE enrichment and no Eu anomalies (Eu/Eu* = 0.9 − ~ 1) for all samples. The gemstones selected from the various horizons range in color from light gray, light blue/green, dark blue, pale brown and red. Some of the grains have zircon and ilmenite mineral inclusions while some of the zoned grains show simple core-rim zonation as well as oscillatory and sectorial zoning patterns. Bulk sediment geochemistry of sediments from the Mbiame gem prospect suggests an igneous provenance generally of felsic intermediate source input. The alluvial gemstones from the Mbiame gem prospect are the sapphire variety of corundum and the grains combined with zircon and ilmenite inclusions and megacrysts suggest a derivation from felsic to intermediate igneous rocks.

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“…Note the overall E‐W drops of altitudes within the UP, IP and CP morphometric units, and the distribution of relief erosion levels. The SW Cameroon landform surface and seismic activity are modified after Bate Tibang et al (), Eloumala Onana, Mouzong Pemi, and Bekoa (), Guiraud, Bosworth, Thierry, and Delplanque (), Ntepe et al (), and Owona et al (). Abbreviations: BAK, Bakinguili station; CVL, Cameroon Volcanic Line; CP, Coastal Province; IP, Intermediate Province; NC, Ntem Complex; NyC, Nyong Complex; OBS, Observatory; OC, Oubanguide Complex; SF, Sanaga Fault ; UP, Upper Province; YG, Yaounde Group…”

Section: Introductionmentioning

confidence: 99%

Evolution of the Edea‐Eseka geomorphic units: A 'natural laboratory' of a prototype active rifting cross‐cutting the Southern Cameroon (West African) passive margin

et al. 2019

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The SW Cameroonian passive margin, a part of the Cameroon Low-Plateau, presents several topographic levels cross-cut by the Sanaga Fault (SF), Benue Triple Junction and Cameroon Volcanic Line (CVL), three pre-and syn-rift tectonic features that are still active. This study carried out on the Edea-Eseka Region (EER) a portion of this margin (3 30 0 -4 N, 10 -10 55 0 E) aims to constrain the relationships between these features and the development of the morphology. Geomorphic indices, combined with field observations and supported by literature data show that the interactive activity of these structures constitutes the main force that controls the EER morphology. From West to East, EER consists of three morphotectonic units: the Coastal, Intermediate and Upper units. The Coastal unit built on the Douala-Kribi/Campo Basin (<65 Ma) and assigned to the Aptian South Atlantic rifting, exhibits low reliefs deeply incised. The Intermediate and Upper units are developed on the Nyong and Oubanguide crystallophyllian complexes during the Eburnean/Trans-Amazonian (2,400-1,750 Ma) and Pan-African (650-540 Ma) orogenies, respectively. The Intermediate unit with moderate reliefs registers a strong differential erosion, whilst the Upper unit records high-reliefs. Geomorphic indices, tectonic and recent seismic data reveal that the EER has been rejuvenated, experienced uplifts and tiltings synchronously with the main active phases of these features. The timing and magnitude of these activities vary from one unit to another. The morphotectonic model is consistent to the crucial tectonic phases: emplacement of SF (Palaeozoic), the breakup of Gondwana and erection of CVL (Cretaceous).

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Petrology and geochronology of felsic volcanics in the Sabga area (Bamenda Highlands): implications for age variation along the Cameroon Volcanic Line

Cited by 4 publications

References 50 publications

Mineralogy and Texture of the Weathered Products from Silicic Lavas in the Sabga Area, North West Cameroon

Mineralogy and Texture of the Weathered Products from Silicic Lavas in the Sabga Area, North West Cameroon

Gemstones-bearing sediments in the Mbiame floodplain, northwestern Cameroon

Evolution of the Edea‐Eseka geomorphic units: A 'natural laboratory' of a prototype active rifting cross‐cutting the Southern Cameroon (West African) passive margin

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