The Central African Shear Zone (CASZ) (or Shear System) is a wrench fault system extending in an ENE course from the Gulf of Guinea via Cameroon into Sudan. The structure isn't nicely understood. The shear zone dates to no less than 640 Ma (million years ago). Motion occurred alongside the zone in the course of the break-up of Gondwanaland in the Jurassic and Cretaceous intervals. Among the faults in the zone had been rejuvenated greater than once earlier than and in the course of 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 publish-Cretaeous formation. The Benue Trough lies to the north, and the Foumban Shear Zone to the south. Volcanic activity has occurred along 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 on this area is thinned in a relatively narrow 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 only to the Darfur area of western Sudan. It's now interpreted to extend into central and Wood Ranger Power Shears shop jap Sudan, with a total size of 4,000 km. Within the Sudan, the shear zone could have acted as a structural barrier to development of deep Cretaceous-Tertiary sedimentary basins in the north of the area. Objections to this principle are that the Bahr el Arab and Wood Ranger Power Shears shop Blue Nile rifts lengthen northwest beyond one proposed line for the shear zone. However, the alignment of the northwestern ends of the rifts on this areas helps the theory. Ibrahim, Ebinger & Fairhead 1996, pp.

Dorbath et al. 1986, pp. Schlüter & Trauth 2008, pp. Foulger & Jurdy 2007, Wood Ranger Power Shears official site pp. Plomerova et al. 1993, pp. Bowen & Jux 1987, pp. Bowen, Robert