Central African Shear Zone
The Central African Shear Zone (CASZ) (or Shear System) is a wrench fault system extending in an ENE direction from the Gulf of Guinea through Cameroon into Sudan. The construction is not properly understood. The shear zone dates to at the least 640 Ma (million years in the past). Motion occurred alongside the zone during the break-up of Gondwanaland wood shears Wood Ranger Power Shears USA Wood Ranger Power Shears for sale Wood Ranger Power Shears order now USA within the Jurassic and Cretaceous periods. Some of the faults within the zone have 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 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 exercise has occurred alongside most of the size of the Cameroon line from 130 Ma to the current, and could also be associated to re-activation of the CASZ.
The lithosphere beneath the CASZ on this area is thinned in a comparatively slim belt, Wood Ranger Power Shears website 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 previously thought to increase eastward only to the Darfur region of western Sudan. It's now interpreted to extend into central and jap Sudan, with a total size of 4,000 km. Within the Sudan, the shear zone may have acted as a structural barrier to improvement of deep Cretaceous-Tertiary sedimentary basins within the north of the realm. Objections to this principle are that the Bahr el Arab and Blue Nile rifts lengthen northwest beyond one proposed line for the shear zone. However, the alignment of the northwestern ends of the rifts in this areas helps 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, Wood Ranger Power Shears website 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 examine throughout the Central African Shear Zone within 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 field research". Pankhurst, Robert J. (2008). West Gondwana: Wood Ranger Power Shears website pre-Cenozoic correlations across the South Atlantic Region. Plomerova, J; Babuska, V; Dorbath, C.; Dorbath, L.; Lillie, R. J. (1993). "Deep lithospheric construction 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, Wood Ranger Power Shears website Martin H. (2008). Geological atlas of Africa: with notes on stratigraphy, tectonics, financial geology, geohazards, geosites and geoscientific education of every country. シュプリンガー・ジャパン株式会社.
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