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Geophysical and geological evidence for the Benue-Chad Basin Cretaceous rift valley system and its tectonic implications

1984; Elsevier BV; Volume: 2; Issue: 2 Linguagem: Inglês

10.1016/s0731-7247(84)80008-7

0731-7247

C. R. Cratchley, Pierre Louis, D.E. Ajakaiye,

Geophysical and Geoelectrical Methods

Various geological and geophysical studies of the Chad Basin and Benue trough are reviewed. We critically examine the geodynamic models previously proposed for the region and finally present our own model. The main points of this model are as follows: a Precambrian origin for the major anomaly of Haraz, the Benue trough interpreted as a failed arm of the triple junction created during the opening of the Atlantic, the interpretation of the Bake-Birao trough as an extension of the Ngaundere-Mbere system rejuvenated in the Cretaceous; and a phase of extension in the East Niger contemporaneous with the Benue closing.