Tectonic evolution of the Yaoundé segment of the Neoproterozoic Central African Orogenic Belt in southern Cameroon

Mvondo, Hubert; Owona, Sébastien; Ondoa, Joseph Mvondo; Essono, Jean

doi:10.1139/e06-107

Cited by 99 publications

(78 citation statements)

References 30 publications

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“…Geophysical studies [7] [10] [23] show that the boundary of CC and Pan-African is around 4˚N. The tectonic features (faults and folds) are fitted into the CAFB's deformation history and could be due to the Tran Saharan east-west collision system [24]. Some buried faults have being confirmed in the geophysical studies [11] [23] [25].…”

Section: Geology and Tectonic Settingmentioning

confidence: 83%

Combination of Tilt-Angle and Euler Deconvolution Approaches to Determine Structural Features from Aeromagnetic Data Modeling over Akonolinga-Loum Area (Centre-East, Cameroon)

Yandjimain¹,

Ndougsa‐Mbarga²,

Meying³

et al. 2017

IJG

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Aeromagnetic data for center-east Cameroon between the latitudes 3.5˚ to 4.5˚N and longitudes 12˚ to 12.5˚E are used to further study the subsurface area of this part of the geological Province of Central Africa and the Congo Craton. The GIS and GEOSOFT v6.5 softwares are used to treat the data. This analysis enabled us to explore our study area from surface right to the base. The Tilt Angle method is used to delineate geological structures and to estimate the depth. The Euler's deconvolution method is used to estimate the specific depth of structural contacts. We estimate the northern boundary of the Congo Craton and southern boundary of the Pan-African starting from 3˚7'N of West to 3˚75'N of East. Its depth is estimated around 2.6 km for deep and 0.1 km for shallow while the direction is WSW-ENE and the NW slope varies from 30˚ to 60˚. We obtain that main and minor lineaments exist throughout, from the surface to the base of the area with their principal direction being SW-NE. We also obtain the vertical gradient contact and the quasihorizontal contact. This is proof of the subduction of the Pan-African belt under the Congo Craton due to the intense collision which caused the rejuvenation of the crust. The main consequence of this collision is the formation of pudding 926 International Journal of Geosciences and fold structures, beginning from the superficial part right to the base and which caused the intrusion of schistose, chlorite-schist, quartzite in the micaschist and the intrusions of gneiss and garnetiferous schist in the migmatite. In our study, we highlight the presence of 37 major and 523 minor lineaments that localize the circulation of minerals. The probable slope of the lineaments in the northern part of the region varies from 30˚ to 60˚ in a SE direction while in the southern part, and it varies from 30˚ to 60˚ in a NW direction.

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Section: Geology and Tectonic Settingmentioning

confidence: 83%

Combination of Tilt-Angle and Euler Deconvolution Approaches to Determine Structural Features from Aeromagnetic Data Modeling over Akonolinga-Loum Area (Centre-East, Cameroon)

Yandjimain¹,

Ndougsa‐Mbarga²,

Meying³

et al. 2017

IJG

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“…The S 2 foliation is a regional, steeply dipping planar fabric with variably oriented stretching lineation and large-scale open folds that are associated with N-S trending sinistral and dextral strike-slip faults and mylonitic (S 3 ) foliation. The S 2 foliation is well observed in the greenstone units of the Ntem complex and its development is linked to dome-and-basin tectonics related to diapiric movements [18].…”

Section: Introductionmentioning

confidence: 95%

“…Also, [7] showed the morphological difference and the tectonically subdivision into two tectonic sectors corresponding to the Congo Craton in the south, Pan-African in the north and helped identify the tectonic boundary separating them at depth. The tectonic features (faults and folds) are fitted into the CAFB's deformation history and could be due to the Trans-Saharan east-west collision system [18]. Some buried faults have been confirmed in geophysical studies [16] [19].…”

Section: Introductionmentioning

confidence: 99%

Aeromagnetic Data Modeling for Geological and Structural Mappings over the DJADOM-ETA Area, in the Southeastern Cameroon

Yandjimain¹,

Ndougsa‐Mbarga²,

Bi‐Alou³

et al. 2018

IJG

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The DJADOM-ETA area is in south-eastern of Cameroon, within the Congo Craton (CC) formations and composed of gneiss and amphibolite, migmatites and intrusive rocks. Few geophysical studies have been carried out over surrounding areas, but no investigation on the study area. The existence of aeromagnetic data covering the study area has motivated the application of a multiscale approach for tectonic features identification. The aim of this work is to interpret Aeromagnetic Data for Geological and Structural Mappings in the southeastern Cameroon. The GIS and GEOSOFT v8.4 softwares are used to treat data of Compagnie Minière du Cameroun getting in February 2012. The Tilt Angle method is used to delineate geological structures and to estimate the depth. The Euler's Deconvolution method is used to estimate the specific depth of structural contacts. The presence of bifurcations, accompanied by virgations, leading to the occurrence of several faults. Principal lineaments are determined with the main direction being ESE-WNW and E-W for the minor lineaments. The study highlights two major faults: ESE-WNW and ENE-WSW, where the former dominates, what could be called the geological accident of ETA. The Euler's Correlation and Tilt derivative contact map shows that most of the faults are vertical contacts. The geometrical description of this structure suggests an open synclinal transposed on vertical foliations: the major fault at the DJADOM axis is quasi-parallel to the Northern limit of the CC and parallel to the Sanaga Fault (SF) and the Central Cameroon Shear Zone (CCSZ). The features show a base strongly affected by tectonic which characterizes the transition between the zone from the CC and the belt from folds of the Pan-African. Also, the presence of the network characterizes the subsurface undulation in this study area: the intrusion of sandstone ochre quartz and schist of the Bek complex, the dolerite of the doleritic complex, and the silver micaschiste and ore quartzite in the base complex. On the TMI anomalies map, several places show high susceptibility contrasts, which is an indication of strong magnetization. Geological indicators point to inferred magnetite, dolerite and ochre schist quartzite which have a strong magnetization in this zone. The presence of weakly magnetized anomalies would be due to the migmatites of the base complex series. This study improved the knowledge of the subsurface structure of this area. It highlighted two major and minor faults. TMI anomalies map, in several places shows high susceptibility contrasts, which is an indication of strong magnetization.

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“…P-T conditions range from 4-9 kbar/675-575°C in the Mbalmayo schists to 7-12 kbar/ 800°-550°C in the Yaoundé migmatites (Mvondo et al, 2003). An alternative interpretation of the exhumation of HP-HT granulites in the Yaoundé Group suggests it is linked with late PanAfrican extensional evolution (Mvondo et al 2003(Mvondo et al , 2007; this interpretation is neither compatible with the important crust thickness (38-42 km) in the Yaoundé region (Poudjoum Djomani et al, 1995), nor with the Adamawa Tertiary uplift situated far to the north as suggested by the authors. The Rocher du Loup shear zone (RLSZ, Fig.…”

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

confidence: 99%

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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Tectonic evolution of the Yaoundé segment of the Neoproterozoic Central African Orogenic Belt in southern Cameroon

Cited by 99 publications

References 30 publications

Combination of Tilt-Angle and Euler Deconvolution Approaches to Determine Structural Features from Aeromagnetic Data Modeling over Akonolinga-Loum Area (Centre-East, Cameroon)

Combination of Tilt-Angle and Euler Deconvolution Approaches to Determine Structural Features from Aeromagnetic Data Modeling over Akonolinga-Loum Area (Centre-East, Cameroon)

Aeromagnetic Data Modeling for Geological and Structural Mappings over the DJADOM-ETA Area, in the Southeastern Cameroon

Plates Amalgamation and Plate Destruction, the Western Gondwana History

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