Central African Shear Zone

The Central African Shear Zone (CASZ) (or Shear System) is a wrench fault system extending in an ENE course from the Gulf of Guinea by means of Cameroon into Sudan. The structure is just not properly understood. The shear zone dates to at the very least 640 Ma (million years in the past). Motion occurred alongside the zone in the course of the break-up of Gondwanaland within the Jurassic and Cretaceous intervals. Among the faults in the zone have been rejuvenated more than once earlier than and through the opening of the South Atlantic within the Cretaceous interval. It has been proposed that the Pernambuco fault in Brazil is a continuation of the shear zone to the west. In Cameroon, the CASZ cuts across the Adamawa uplift, a publish-Cretaeous formation. The Benue Trough lies to the north, and the Foumban Shear Zone to the south. Volcanic activity has occurred along many of the length of the Cameroon line from 130 Ma to the present, and may be related to re-activation of the CASZ.



The lithosphere beneath the CASZ on this area is thinned in a relatively narrow belt, with the asthenosphere upwelling from a depth of about 190 km to about a hundred and twenty km. The Mesozoic and Tertiary movements have produced elongated rift basins in central Cameroon, northern Central African Republic and southern Chad. The CASZ was previously thought to extend eastward only to the Darfur area of western Sudan. It is now interpreted to extend into central and japanese Sudan, with a total length of 4,000 km. Within the Sudan, the shear zone might have acted as a structural barrier to development of deep Cretaceous-Tertiary sedimentary basins in the north of the realm. Objections to this theory are that the Bahr el Arab and Blue Nile rifts extend northwest past one proposed line for the shear zone. However, the alignment of the northwestern ends of the rifts on this areas supports the theory. Ibrahim, Ebinger & Fairhead 1996, pp.



Dorbath et al. 1986, pp. Schlüter & Trauth 2008, pp. Foulger & Jurdy 2007, pp. Plomerova et al. 1993, pp. Bowen & Jux 1987, pp. Bowen, Robert; Jux, Ulrich (1987). Afro-Arabian geology: a kinematic view. Dorbath, C.; Dorbath, L.; Fairhead, J. D.; Stuart, G. W. (1986). "A teleseismic delay time study throughout the Central African Shear Zone in the Adamawa area of Cameroon, West Africa". Foulger, Gillian R.; Jurdy, Donna M. (2007). Plates, plumes, and planetary processes. Geological Society of America. Ibrahim, A. E.; Ebinger, C. J.; Fairhead, J. D. (20 April 1996). "Lithospheric extension northwest of the Central African Shear Zone in Sudan from potential discipline studies". Pankhurst, Robert J. (2008). West Gondwana: pre-Cenozoic correlations throughout the South Atlantic Region. Plomerova, J; Babuska, V; Dorbath, C.; Dorbath, L.; Lillie, R. J. (1993). "Deep lithospheric structure throughout the Central African Shear Zone in Cameroon". Geophysical Journal International. One hundred fifteen (2): Wood Ranger Power Shears website Wood Ranger Power Shears cordless power shears cordless power shears specs 381-390. Bibcode:1993GeoJI.115..381P. Selley, Richard C. (1997). African basins. Schlüter, Thomas; Trauth, Martin H. (2008). Geological atlas of Africa: with notes on stratigraphy, tectonics, economic geology, geohazards, geosites and geoscientific education of each nation. シュプリンガー・ジャパン株式会社.



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