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Central African Shear Zone
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Central African Shear Zone : ウィキペディア英語版
Central African Shear Zone

The Central African Shear Zone (CASZ) (or Shear System) is a wrench fault system extending in an ENE direction from the Gulf of Guinea through Cameroon into Sudan.
The structure is not well understood.
As of 2008 there was still no general agreement about how the individual shears along the lineament link up.
==Description==

The shear zone dates to at least 640 MA (million years ago).
Motion occurred along the zone during the break-up of Gondwanaland in the Jurassic and Cretaceous ages.
Some of the faults in the zone were rejuvenated more than once before and during the opening of the South Atlantic in the Cretaceous era.
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 along most of the length 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 area is thinned in a relatively narrow 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.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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