Kinematic evolution of the Fodjomekwet-Fotouni Shear Zone (West-Cameroon): Implications for emplacement of the Fomopéa and Bandja plutons

Kouémo, Jules Tcheumenak; Njanko, Théophile; Kwékam, Maurice; Naba, Séta; Nké, B.E. Bella; Sandjo, A F Yakeu; Fozing, Eric Martial; Njonfang, Emmanuel

doi:10.1016/j.jafrearsci.2014.07.018

Cited by 40 publications

(22 citation statements)

References 35 publications

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“…The NE-SW trending lineaments bear two lineaments continuous over more than 136 km through Bafoussam and Foumban cities (Figure 3). It matches with the Foutoni-Fondjomokwet Shear Zone [45] which is the SW prolongation of the Adamawa Shear Zone. Another NE-SW trending lineaments with a length of 55 km, filled with quartzite is recorded at the southwest of the city of Bangangte (Figure 3).…”

Section: Geometrical Analysis and Distribution Of Lineamentsupporting

confidence: 63%

“…These features point to a structural control of the emplacement of Mesozoic and Paleozoic magmatism by pre-existent structures of which the geometrical arrangement is consistent with Riedel's structures kinematics. Furthermore, the stress field direction of this fault network is consistent with that of the last dextral shearing movement (D3 event) in the Central Africa fold belt [22] [34] [45]. This dextral shearing movement which was still active at 552 Ma [43] following collision between West Africa and Congo Cratons [28] resulted in this fault network which controlled the emplacement of N30˚E oriented late Pan-African grani-toids [41] or NE-SW to E-W transcurrent/transpressive movement that controlled the late pan-African granitization [15] [48].…”

Section: Basement Control On Paleozoic and Mesozoic Basalt Dykes Emplsupporting

confidence: 55%

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Structural Relationship between Brittle Deformation and Paleozoic to Mesozoic Basalt Dykes in the Precambrian Basement of the Southern Continental Part of the Cameroon Volcanic Line

Simeni¹,

Tchato²,

Belnoun³

et al. 2017

IJG

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The work is a vivid description of the structural relationship between brittle deformation of the Precambrian basement in the southern continental part of the Cameroon Line and intrusive Paleozoic and Mesozoic basalt dykes swarms. A multidisciplinary approach that involves a combination of remote sensing techniques and field studies show that the major trend of brittle structures correspond to well-known regional structures: N70˚E (Adamawa Shear Zone), N135˚E (upper Benue trend) and N30˚E (Cameroon Volcanic Line) corresponding to E-W and N-S directions respectively. Basalt dykes are associated to NE-SW, E-W and NW-SE oriented fractures. An integration of the available information on brittle structures and basalt dykes directions suggest an emplacement of the Mesozoic and Paleozoic basalt dykes structurally controlled by Precambrian structures that were originated through Riedel's fracture kinematic model with dextral strike-slip Adamawa Shear Zone as the main shear zone during late stage of the Pan-African collision. Spatially, the restriction of the basalt dykes to the corridor of the Adamawa Shear Zone indicate that a rejuvenation of Precambrian faults may very well be the origin of the dykes with possibility that they may have been reworked several times during the Phanerozoic eon.

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Section: Geometrical Analysis and Distribution Of Lineamentsupporting

confidence: 63%

Section: Basement Control On Paleozoic and Mesozoic Basalt Dykes Emplsupporting

confidence: 55%

Structural Relationship between Brittle Deformation and Paleozoic to Mesozoic Basalt Dykes in the Precambrian Basement of the Southern Continental Part of the Cameroon Volcanic Line

Simeni¹,

Tchato²,

Belnoun³

et al. 2017

IJG

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“…The latter are interpreted to be a weakness zone which constitutes the pathway for magma ascent. This shear zone coincides with the N40-50˚E branch of CCSZ [21] [22] [23]. At the beginning of the NW-SE oriented P3 profile (Figure 9), the low gravity anomaly with amplitude not greater than 4 mGal are observed.…”

Section: 5d Gravity Forward Resultsmentioning

confidence: 55%

Evidence for the Upwelling of Mafic Bodies into the Upper Crust beneath the N40-50&#176;E Branch of the Pan-African Central Cameroon Shear Zone from Gravity Studies

Yap¹,

Nouayou²,

Tchato³

et al. 2018

OJG

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The existence of mafic bodies at mid crustal level beneath the Pan-African Central Cameroon Shear Zone is still a matter of debate. To provide additional constrains on this issue, the crust of the west region of Cameroon has been investigated using gravity data. Analyses of these data show N40-50˚E oriented iso-anomal contours in the Bafoussam area, interpreted as the N40-50˚E branch of the Central Cameroon Shear Zone. In addition, spectral analysis and 2.5D gravity modeling reveal intrusions of mafic bodies at depth between 3.2 and 14.2 km under N40-50˚E aligned volcanic centers, namely Mt Bambouto and Mt Mbapit. The above observations suggest a structurally controlled emplacement of the mafic bodies. In the light of the recent geophysical data, the interaction between the NE-ward channel flow operating at the bottom of the lithosphere or the asthenosphere upwelling and the Cameroon Shear Zone could better explain the magma upwelling in the upper crust. This result is the novelty of the present work.

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“…The outcrops of such rock result in the development of several geomorphological units and give rise to the uneven topography. The volcanic rocks from Fotouni crop out in a NE-SW mylonitic corridor displaying porphyritic, fine to very fine grained mylonites from its border to the core [8]. This basement rock is highly sheared and fractured.…”

Section: Geological Settingmentioning

confidence: 99%

“…This basement rock is highly sheared and fractured. According to [8], two shear deformational phases are recorded by the FFSZ, and early sinistral and a late dextral. These shear deformation phases were transcurent, developed pull-apart basins which facilitate the emplacement of the Fomopéa and Bandja plutons [8].…”

Section: Geological Settingmentioning

confidence: 99%

The NE-SW Trending Fotouni and Fangam Basalt Cones: Evidence of Tectonic Control on Their Emplacement

Tchikankou

Kouémo

Ngongang

et al. 2020

EJGEO

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The Fotouni volcanic rocks outcrop within mylonitic corridor, in the southern domain of the continental part of Cameroon Line (CL). The NE-SW shape display by these volcanic rocks within the mylonitic corridor is an uncommon case along the CL. Field and petrographic data and spaces image analysis were performed in order to understand the NE-SW shape display by these rocks. Geochemical data display two distinct volcanic compositional groups: alkaline lavas and transitional lavas. Alkaline series ranges in composition from basanite, basalt to hawaiite and transitional series range from basalt, trachy-basalt to basaltic trachy-andesite. Field investigations show that the Fotouni, Fangam, Song and Mbeng basalts outcrops as NE-SW trending prismatic dykes which displaying well differentiated vertical tetragonal, pentagonal and hexagonal prisms within the Fotouni-Kékem shear zone (FFSZ). The overall NE-SW orientation of hills, where these prisms outcrop suggests the tectonic control on the emplacement of these rocks. Indeed, the activation of the FFSZ developed various fracture networks that facilitate magma uplift and the emplacement of the Fomopéa and Bandja plutons during the Pan-African orogeny. These Pan-African activations of the Fotouni fault weaken the crust during the Paleozoic. These weaken zones constitute path way for emplacement of volcanic dykes during the Tertiary within the NE-SW faults, probably facilitated by the general extension at the end of Cretaceous.

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Kinematic evolution of the Fodjomekwet-Fotouni Shear Zone (West-Cameroon): Implications for emplacement of the Fomopéa and Bandja plutons

Cited by 40 publications

References 35 publications

Structural Relationship between Brittle Deformation and Paleozoic to Mesozoic Basalt Dykes in the Precambrian Basement of the Southern Continental Part of the Cameroon Volcanic Line

Structural Relationship between Brittle Deformation and Paleozoic to Mesozoic Basalt Dykes in the Precambrian Basement of the Southern Continental Part of the Cameroon Volcanic Line

Evidence for the Upwelling of Mafic Bodies into the Upper Crust beneath the N40-50&#176;E Branch of the Pan-African Central Cameroon Shear Zone from Gravity Studies

The NE-SW Trending Fotouni and Fangam Basalt Cones: Evidence of Tectonic Control on Their Emplacement

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Kinematic evolution of the Fodjomekwet-Fotouni Shear Zone (West-Cameroon): Implications for emplacement of the Fomopéa and Bandja plutons

Cited by 40 publications

References 35 publications

Structural Relationship between Brittle Deformation and Paleozoic to Mesozoic Basalt Dykes in the Precambrian Basement of the Southern Continental Part of the Cameroon Volcanic Line

Structural Relationship between Brittle Deformation and Paleozoic to Mesozoic Basalt Dykes in the Precambrian Basement of the Southern Continental Part of the Cameroon Volcanic Line

Evidence for the Upwelling of Mafic Bodies into the Upper Crust beneath the N40-50&amp;#176;E Branch of the Pan-African Central Cameroon Shear Zone from Gravity Studies

The NE-SW Trending Fotouni and Fangam Basalt Cones: Evidence of Tectonic Control on Their Emplacement

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Evidence for the Upwelling of Mafic Bodies into the Upper Crust beneath the N40-50°E Branch of the Pan-African Central Cameroon Shear Zone from Gravity Studies