「Central African Shear Zone」を編集中

<br>The Central African Shear Zone (CASZ) (or Shear System) is a wrench fault system extending in an ENE path from the Gulf of Guinea by means of Cameroon into Sudan. The structure will not be effectively understood. The shear zone dates to a minimum of 640 Ma (million years in the past). Motion occurred along the zone throughout the break-up of Gondwanaland in the Jurassic and Cretaceous intervals. A number of the faults in the zone had been rejuvenated more than as soon as earlier than and through 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 across the Adamawa uplift,  [http://89.234.183.97:3000/miguelspillman branch cutting shears] a submit-Cretaeous formation. The Benue Trough lies to the north, and the Foumban Shear Zone to the south. Volcanic activity has occurred along many of the length of the Cameroon line from 130 Ma to the current, and could also be related to re-activation of the CASZ.<br><br><br><br>The lithosphere beneath the CASZ on this space is thinned in a comparatively slim belt, 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 extend into central and japanese Sudan, with a complete length of 4,000 km. In the Sudan, the shear zone might have acted as a structural barrier to improvement of deep Cretaceous-Tertiary sedimentary basins within the north of the area. Objections to this theory 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 speculation. Ibrahim, Ebinger & Fairhead 1996, pp.<br> <br><br><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; 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 within the Adamawa area 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 research". Pankhurst, Robert J. (2008). West Gondwana: pre-Cenozoic correlations throughout the South Atlantic Region. Plomerova, J; Babuska, V; Dorbath, C.; Dorbath,  [http://www.pottomall.com/bbs/board.php?bo_table=free&wr_id=5581514 branch cutting shears] L.; Lillie, R. J. (1993). "Deep lithospheric construction 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, tectonics, economic geology, geohazards, geosites and geoscientific education of each country. シュプリンガー・ジャパン株式会社.<br><br><br><br>Viscosity is a measure of a fluid's charge-dependent resistance to a change in shape or  [https://jp2hand.com/forum.php?mod=viewthread&tid=142180 branch cutting shears] to motion of its neighboring portions relative to each other. For liquids, it corresponds to the informal idea of thickness; for example, syrup has a better viscosity than water. 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