Central African Shear Zone

The Central African Shear Zone (CASZ) (or Shear System) is a wrench fault system extending in an ENE route from the Gulf of Guinea by way of Cameroon into Sudan. The structure isn't nicely understood. The shear zone dates to not less than 640 Ma (million years in the past). Motion occurred alongside the zone throughout the break-up of Gondwanaland in the Jurassic and Cretaceous periods. A number of the faults in the zone were rejuvenated more than once earlier than and during the opening of the South Atlantic in the Cretaceous period. 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 the Foumban Shear Zone to the south. Volcanic exercise has occurred alongside most of the length of the Cameroon line from 130 Ma to the present, and could also be associated to re-activation of the CASZ.

The lithosphere beneath the CASZ in this area is thinned in a relatively slim belt, buy Wood Ranger Power Shears with the asthenosphere upwelling from a depth of about 190 km to about a hundred and 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 extend eastward only to the Darfur region of western Sudan. It's 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 growth of deep Cretaceous-Tertiary sedimentary basins in the north of the area. Objections to this principle are that the Bahr el Arab and Blue Nile rifts extend northwest beyond one proposed line for the shear zone. However, the alignment of the northwestern ends of the rifts in 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: buy Wood Ranger Power Shears a kinematic view. Dorbath, C.; Dorbath, L.; Fairhead, J. D.; Stuart, G. W. (1986). "A teleseismic delay time study throughout the Central African Shear Zone in the Adamawa area of Cameroon, West Africa". Foulger, Gillian R.; Jurdy, buy Wood Ranger Power Shears Donna M. (2007). Plates, plumes, and planetary processes. Geological Society of America. Ibrahim, A. E.; Ebinger, buy Wood Ranger Power Shears C. J.; Fairhead, J. D. (20 April 1996). "Lithospheric extension northwest of the Central African Shear Zone in Sudan from potential discipline research". Pankhurst, Robert J. (2008). West Gondwana: pre-Cenozoic correlations throughout the South Atlantic Region. Plomerova, J; Babuska, V; Dorbath, Wood Ranger Power Shears specs Wood Ranger Power Shears for sale Wood Ranger Power Shears website Wood Ranger Power Shears for sale USA C.; Dorbath, L.; Lillie, R. J. (1993). "Deep lithospheric structure across 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, Martin H. (2008). Geological atlas of Africa: with notes on stratigraphy, electric power shears 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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