Central African Shear Zone

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The Central African Shear Zone (CASZ) (or Shear System) is a wrench fault system extending in an ENE path from the Gulf of Guinea by way of Cameroon into Sudan. The construction is not properly understood. The shear zone dates to not less than 640 Ma (million years in the past). Motion occurred along the zone during the break-up of Gondwanaland within the Jurassic and Wood Ranger Power Shears reviews Cretaceous intervals. Among the faults in the zone were rejuvenated more than as soon as before and through the opening of the South Atlantic within the Cretaceous period. 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 put up-Cretaeous formation. The Benue Trough lies to the north, and the Foumban Shear Zone to the south. Volcanic activity has occurred alongside a lot of the size 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 in this area is thinned in a comparatively slim belt, with the asthenosphere upwelling from a depth of about 190 km to about 120 km. The Mesozoic and Tertiary movements have produced elongated rift basins in central Cameroon, northern Central African Republic and southern Chad. The CASZ was formerly thought to extend eastward only to the Darfur area of western Sudan. It is now interpreted to increase into central and eastern Sudan, Wood Ranger official with a total length of 4,000 km. In the Sudan, the shear zone could have acted as a structural barrier to growth of deep Cretaceous-Tertiary sedimentary basins in the north of the world. Objections to this concept are that the Bahr el Arab and Blue Nile rifts lengthen northwest past one proposed line for the shear zone. However, the alignment of the northwestern ends of the rifts in this areas helps the speculation. Ibrahim, Ebinger & Fairhead 1996, pp.



Dorbath et al. 1986, pp. Schlüter & Trauth 2008, pp. Foulger & Jurdy 2007, Wood Ranger Power Shears reviews 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 within the Adamawa area of Cameroon, West Africa". Foulger, Gillian R.; Jurdy, Wood Ranger Power Shears reviews 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 area research". Pankhurst, Robert J. (2008). West Gondwana: pre-Cenozoic correlations across 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. 115 (2): 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, financial geology, geohazards, geosites and geoscientific schooling of each country. シュプリンガー・ジャパン株式会社.



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