The Central African Shear Zone (CASZ) (or Shear System) is a wrench fault system extending in an ENE route from the Gulf of Guinea through Cameroon into Sudan. The structure is just not well understood. The shear zone dates to at least 640 Ma (million years in the past). Motion occurred along the zone during the break-up of Gondwanaland high capacity pruning tool within the Jurassic and Cretaceous durations. Some of the faults within the zone have been rejuvenated greater than as soon as before and throughout 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 submit-Cretaeous formation. The Benue Trough lies to the north, and high capacity pruning tool 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 buy Wood Ranger Power Shears coupon Wood Ranger Power Shears manual Wood Ranger Power Shears warranty Wood Ranger Power Shears features may be associated to re-activation of the CASZ.
external site The lithosphere beneath the CASZ in this space is thinned in a relatively slender belt, with the asthenosphere upwelling from a depth of about 190 km to about 120 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 is now interpreted to increase into central and eastern Sudan, with a total size of 4,000 km. Within the Sudan, the shear zone could have acted as a structural barrier to improvement of deep Cretaceous-Tertiary sedimentary basins within the north of the area. Objections to this idea are that the Bahr el Arab and Blue Nile rifts extend 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, J. D.; Stuart, G. W. (1986). “A teleseismic delay time examine throughout the Central African Shear Zone in 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, J. D. (20 April 1996). “Lithospheric extension northwest of the Central African Shear Zone in Sudan from potential subject 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. One hundred 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, high capacity pruning tool tectonics, financial geology, geohazards, geosites and geoscientific education of each nation. シュプリンガー・ジャパン株式会社.
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