Foumban Shear Zone

The Foumban Shear Zone, or Central Cameroon Shear Zone (CCSZ), is a fault zone in Cameroon that has been correlated with the Pernambuco fault in northeastern Brazil, which splays from the Trans-Brazilian Lineament.^[1] It is part of the Central African Shear Zone (CASZ) and dates to at least 640 million years ago. The zone was rejuvenated several times, usually with a dextral movement, before and during the opening of the South Atlantic in the Cretaceous period.^[2]

The Foumban shear zone is a series of faults associated with major mylonite zones, a segment of the CASZ. The CASZ can be traced from the Sudan to the Adamawa plateau, after which its path is obscured by volcanoes. Based on reconstruction of the configuration of South America before it separated from Africa, the zone can be identified with the Pernambuco fault.^[3] The shear zone underlies a chain of active volcanoes, called the Cameroon Volcanic Line. In August 1986 a magnitude 5 earthquake with epicenter near Lake Nyos indicated that the shear zone may be again reactivating.^[4]^[vague]

References

^ J D Fairhead; Nasreddine Bournas; M Chaker Raddadi (2007). "The Role of Gravity and Aeromagnetic Data in Mapping Mega Gondwana Crustal Lineaments: the Argentina – Brazil – Algeria (ABA) Lineament" (PDF). SEG. Archived from the original (PDF) on 2011-07-11. Retrieved 2011-01-30.
^ C. Dorbath; L. Dorbath; D. Fairhead; G. W. Stuart (1986). "A teleseismic delay time study across the Central African Shear Zone in the Adamawa region of Cameroon, West Africa" (PDF). Geophys. J. R. astr. Soc. pp. 751–766. Archived from the original (PDF) on 2011-08-07. Retrieved 2011-01-31.
^ G. W. STUART; J.D. FAIRHEAD; L. DORBATH; C. DORBATH (1985). "CRUSTAL STRUCTURE OF THE ADAMAWA PLATEAU CAMEROON" (PDF). Revue Sciences et Techniques, Série Sciences de la Terre. Retrieved 2011-01-31.
^ "Quake may have triggered Nyos disaster". New Scientist. 12 Feb 1987. Retrieved 2011-01-31.^{[permanent dead link]}

6°37′0″N 12°52′0″E / 6.61667°N 12.86667°E / 6.61667; 12.86667

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[Fairhead2007-1] J D Fairhead; Nasreddine Bournas; M Chaker Raddadi (2007). "The Role of Gravity and Aeromagnetic Data in Mapping Mega Gondwana Crustal Lineaments: the Argentina – Brazil – Algeria (ABA) Lineament" (PDF). SEG. Archived from the original (PDF) on 2011-07-11. Retrieved 2011-01-30.

[2] C. Dorbath; L. Dorbath; D. Fairhead; G. W. Stuart (1986). "A teleseismic delay time study across the Central African Shear Zone in the Adamawa region of Cameroon, West Africa" (PDF). Geophys. J. R. astr. Soc. pp. 751–766. Archived from the original (PDF) on 2011-08-07. Retrieved 2011-01-31.

[3] G. W. STUART; J.D. FAIRHEAD; L. DORBATH; C. DORBATH (1985). "CRUSTAL STRUCTURE OF THE ADAMAWA PLATEAU CAMEROON" (PDF). Revue Sciences et Techniques, Série Sciences de la Terre. Retrieved 2011-01-31.

[4] "Quake may have triggered Nyos disaster". New Scientist. 12 Feb 1987. Retrieved 2011-01-31.^{[permanent dead link]}

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v t e Major African geological formations
Plates	Major plates: African plate Minor plates: Somali plate Microplates: Lwandle plate Madagascar plate Rovuma plate Seychelles plate Victoria Microplate
Cratons and shields	Arabian-Nubian Shield Congo Craton Kaapvaal Craton Kalahari Craton Saharan Metacraton Tanzania Craton Tuareg Shield West African Craton Zimbabwe Craton
Shear zones	Aswa Dislocation Broodkop Shear Zone Central African Shear Zone Chuan Shear Zones Foumban Shear Zone Kandi Fault Zone Mwembeshi Shear Zone Todi Shear Zone Western Meseta Shear Zone
Orogens	Alpine Orogen Cape Fold Belt Damara Orogen East African Orogen Eburnean Orogen Gondwanide Orogen Kibaran Orogen Kuunga Orogen Mauritanide Belt Pan-African orogens Terra Australis Orogen
Rifts	Afar Triangle Anza trough Bahr el Arab rift Benue Trough Blue Nile rift East African Rift Gulf of Suez Rift Lamu Embayment Melut Basin Muglad Basin Red Sea Rift Sangha Aulacogen Atbara rift Urema Valley West and Central African Rift System White Nile rift
Sedimentary basins	Angola Basin Aoukar Blue Nile Basin Chad Basin Congo Basin Douala Basin El Djouf Karoo Basin Gabon Basin Iullemmeden Basin Kufra Basin Murzuq Basin Niger Delta Basin Ogaden Basin Orange River Basin Ouled Abdoun Basin Owambo Basin Reggane Basin Rio del Rey Basin Sirte Basin Somali Coastal Basin Taoudeni Basin Tanzania Coastal Basin Tindouf Basin Turkana Basin
Mountain ranges	Aïr Mountains Atlas Mountains Aurès Mountains Bambouk Mountains Blue Mountains Cameroon line Central Pangean Mountains Chaillu Mountains Drakensberg Eastern Arc Mountains Eastern Rift mountains Ethiopian Highlands Great Escarpment Great Karas Mountains Guinea Highlands Hoggar Mountains Imatong Mountains Jebel Uweinat Loma Mountains Mandara Mountains Marrah Mountains Mitumba Mountains Nuba Mountains Rif Mountains Rwenzori Mountains Sankwala Mountains Serra da Leba Serra da Chela Teffedest Mountains Tibesti Mountains
Inselbergs (aka koppie)	Anti-Atlas Mount Gorongosa Jugurtha Tableland Mount Mabu Mulanje Massif Mont Niénokoué Wase Rock Zuma Rock List of inselbergs