Add 'Central African Shear Zone'

Central-African-Shear-Zone.md

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+<br>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 means of Cameroon into Sudan. The structure just isn't well understood. The shear zone dates to at least 640 Ma (million years ago). Motion occurred alongside the zone during the break-up of Gondwanaland  [Wood Ranger Power Shears official site](https://xn--kgbec7hm.my/index.php/User:Billy89204) within the Jurassic and Cretaceous periods. Some of the faults within the zone were rejuvenated more than as soon as before 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 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 along most of the length of the Cameroon line from 130 Ma to the present, and may be associated to re-activation of the CASZ.<br>
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+<br>The lithosphere beneath the CASZ in 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 previously thought to extend eastward solely to the Darfur region of western Sudan. It's now interpreted to extend into central and eastern Sudan, with a total size of 4,000 km. In the Sudan, the shear zone might have acted as a structural barrier to growth 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 prolong northwest beyond one proposed line for the shear zone. However, the alignment of the northwestern ends of the rifts on this areas supports the idea. Ibrahim, Ebinger & Fairhead 1996, pp.<br>
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+<br>Dorbath et al. 1986, pp. Schlüter & Trauth 2008, pp. Foulger & Jurdy 2007, pp. Plomerova et al. 1993, pp. Bowen & Jux 1987, pp. Bowen, Robert