The Benue trough: Wrench-fault related basin on the border of the equatorial Atlantic

Benkhelil, J.; Dainelli, P.; Ponsard, J.F.; Popoff, Michel R.; Saugy, Luc

doi:10.1016/b978-0-444-42903-2.50037-3

Cited by 23 publications

(10 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…SLAR interpretation of the Benue Trough (Benkhelil et al, 1988) has revealed a number of linear features similar to the above. These lineaments occur as individuals or grouped to form linear traces of large dimension interpreted as the surface effect of important fracture zone generally of tensional or shear type .…”

Section: Introductionmentioning

confidence: 73%

Rare earth element and stable sulphur (δ 34S) isotope study of baryte–copper mineralization in Gulani area, Upper Benue Trough, NE Nigeria

El-Nafaty

2015

Journal of African Earth Sciences

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 73%

Rare earth element and stable sulphur (δ 34S) isotope study of baryte–copper mineralization in Gulani area, Upper Benue Trough, NE Nigeria

El-Nafaty

2015

Journal of African Earth Sciences

View full text Add to dashboard Cite

“…The occurrence of a continental alluvial plain east of the Benue delta could suggest the occurrence of a river system large enough to provide sediments from Central or East Africa to the delta. (Figure 10) During the Santonian, sinistral transpression leads to the inversion of the Benue Trough, producing regional folds and schistosities and forming a mountain range that recorded ~12 km of shortening (Benkhelil and Guiraud, 1980;Benkhelil, 1987Benkhelil, , 1988Benkhelil et al, 1988). The shortening direction varies from N to NW.…”

Section: Late Cenomanian (97-93 Ma): Maximum Continental Flooding (Fimentioning

confidence: 99%

Paleogeographic and structural evolution of northwestern Africa and its Atlantic margins since the early Mesozoic

Chardon

Rouby

et al. 2017

Geosphere

View full text Add to dashboard Cite

The geological evolution of northwestern Africa and its continental margins is investigated in the light of nine Meso-Cenozoic paleogeological maps, which integrate original minimal extent of sedimentary deposits beyond their present-day erosional limits. Mapping is based on a compilation of published original data on the stratigraphy and depositional environments of sediments, structures, magmatism, and low-temperature thermochonology, as well as on the interpretation of industrial seismic and borehole data.We show that rifting of the equatorial domain propagated eastward from the Central Atlantic between the Valanginian (ca. 140 Ma) and the Aptian (ca. 112 Ma) as an en echelon strike-slip and rift system connected to an inland rift network. This network defines a six-microplate synrift kinematic model for the African continental domain. We document persistent, long-wavelength eroding marginal upwarps that supplied clastic sediments to the offshore margin basins and a large intracratonic basin. The latter acted as a transient sediment reservoir because the products of its erosion were transferred both to the Tethys (to the north) and the Atlantic Ocean. This paired marginal upwarpintra cratonic basin source-to-sink system was perturbed by the growth of the late Paleogene Hoggar hotspot swell that fragmented the intracratonic basins into five residual depocenters. By linking the evolution of the continental margins to that of their African hinterland, this study bears important implications for the interplay of long-wavelength deformation and sediment transfers over paired shield-continental margin systems.

show abstract

“…The age of this initiation is best constrained by the ages of metamorphic soles that all cluster around 100-95 Ma. Compression then progressively propagates over a large part of Africa with basement undulations and compressional reactivation of the previously formed rifts at about 85 Ma, i.e., the so-called Santonian event (Benkhelil et al 1988;Benkhelil 1989;Genik 1993;Bosworth et al 1999;Guiraud et al 2005;Bevan and Moustafa 2012;Arsenikos et al 2013) (Fig. 1D).…”

Section: Tectonic History Of Africa and The Neo-tethys Oceanmentioning

confidence: 99%

Neo-Tethys geodynamics and mantle convection: from extension to compression in Africa and a conceptual model for obduction

et al. 2016

View full text Add to dashboard Cite

Since the Mesozoic, Africa has been under extension with shorter periods of compression associated with obduction of ophiolites on its northern margin. Less frequent than “normal” subduction, obduction is a first order process that remains enigmatic. The closure of the Neo-Tethys Ocean, by the Upper Cretaceous, is characterized by a major obduction event, from the Mediterranean region to the Himalayas, best represented around the Arabian Plate, from Cyprus to Oman. These ophiolites were all emplaced in a short time window in the Late Cretaceous, from ∼100 to 75 Ma, on the northern margin of Africa, in a context of compression over large parts of Africa and Europe, across the convergence zone. The scale of this process requires an explanation at the scale of several thousands of kilometres along strike, thus probably involving a large part of the convecting mantle. We suggest that alternating extension and compression in Africa could be explained by switching convection regimes. The extensional situation would correspond to steady-state whole-mantle convection, Africa being carried northward by a large-scale conveyor belt, while compression and obduction would occur when the African slab penetrates the upper–lower mantle transition zone and the African plate accelerates due to increasing plume activity, until full penetration of the Tethys slab in the lower mantle across the 660 km transition zone during a 25 Myr long period. The long-term geological archives on which such scenarios are founded can provide independent time constraints for testing numerical models of mantle convection and slab–plume interactions.

show abstract

The Benue trough: Wrench-fault related basin on the border of the equatorial Atlantic

Cited by 23 publications

References 35 publications

Rare earth element and stable sulphur (δ 34S) isotope study of baryte–copper mineralization in Gulani area, Upper Benue Trough, NE Nigeria

Rare earth element and stable sulphur (δ 34S) isotope study of baryte–copper mineralization in Gulani area, Upper Benue Trough, NE Nigeria

Paleogeographic and structural evolution of northwestern Africa and its Atlantic margins since the early Mesozoic

Neo-Tethys geodynamics and mantle convection: from extension to compression in Africa and a conceptual model for obduction

Contact Info

Product

Resources

About