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 Cameroon into Sudan. The structure shouldn't be nicely understood. The shear zone dates to a minimum of 640 Ma (million years in the past). Motion occurred along the zone during the break-up of Gondwanaland within the Jurassic and Cretaceous intervals. A number of the faults in the zone had been rejuvenated greater than once before and during 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 throughout the Adamawa uplift, a post-Cretaeous formation. The Benue Trough lies to the north, and the Foumban Shear Zone to the south. Volcanic exercise has occurred alongside a lot of the length of the Cameroon line from 130 Ma to the present, and may be associated to re-activation of the CASZ.
The lithosphere beneath the CASZ in this area is thinned in a relatively slender belt, with the asthenosphere upwelling from a depth of about 190 km to about one hundred 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 formerly thought to increase eastward solely to the Darfur region of western Sudan. It's now interpreted to extend into central and japanese Sudan, with a total length of 4,000 km. In the Sudan, Wood Ranger Power Shears shop the shear zone may have acted as a structural barrier to growth of deep Cretaceous-Tertiary sedimentary basins in the north of the world. Objections to this theory 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 on this areas helps the idea. 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, Wood Ranger Power Shears features J. D.; Stuart, G. W. (1986). "A teleseismic delay time examine across the Central African Shear Zone within the Adamawa region 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, Wood Ranger Power Shears warranty 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 across the Central African Shear Zone in Cameroon". Geophysical Journal International. A hundred and fifteen (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 every nation. シュプリンガー・ジャパン株式会社.
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