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 construction will not be effectively 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 in the Jurassic and Cretaceous intervals. Some of the faults in the zone had been rejuvenated greater than once before and during the opening of the South Atlantic in 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 post-Cretaeous formation. The Benue Trough lies to the north, and the Foumban Shear Zone to the south. Volcanic activity has occurred alongside many 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 space is thinned in a relatively slim 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 previously thought to increase eastward solely 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 might 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 for sale Wood Ranger Power Shears for sale Power Shears manual Blue Nile rifts extend 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, Wood Ranger Power Shears website Wood Ranger Power Shears website cordless power shears Shears coupon 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