Benue Trough

Benue Trough
Name	Benue Trough
Type	Rift basin
Country	Nigeria
Region	West Africa
Age	Cretaceous
Namedfor	Benue River

Benue Trough is an elongated sedimentary and structural basin in central and eastern Nigeria formed during the Cretaceous rifting of Gondwana. The trough links to extensional systems across West Africa and the South Atlantic opening, and it has been a focus of studies by institutions such as the University of Ibadan, University of Lagos, Imperial College London, and the Nigerian National Petroleum Corporation. The region’s complex interplay of continental breakup, magmatism, and sedimentation has attracted research by geologists associated with Royal Society, American Geophysical Union, Geological Society of London, and petroleum companies including Shell plc and TotalEnergies.

Geography and extent

The trough extends northeast–southwest across Nigeria between the Sokoto Basin and the Yola Basin near the Cameroon Line and adjoins the coastal basins connected to the Gulf of Guinea and the opening South Atlantic margin studied in the context of the South Atlantic Ocean rift. It crosses states such as Benue State, Taraba State, Adamawa State, Plateau State, and Nasarawa State and follows riverine corridors including the Benue River and tributaries near the city of Makurdi and the regional center Jos. The trough’s geographic limits have been mapped in conjunction with seismic surveys run by Chevron Corporation and scholarly mapping by the British Geological Survey and Nigerian Geological Survey Agency.

Geological history and tectonic setting

Formation of the trough is linked to Cretaceous plate motions during breakup of Gondwana and opening of the South Atlantic Ocean, contemporaneous with extension recorded in the Equatorial Atlantic margin and the Central African Rift System. Models invoke lithospheric stretching associated with mantle upwelling beneath areas influenced by the Sierra Leone Rise and the Cameroon Hotspot track; comparable tectonic drivers are invoked for the Paraná-Etendeka and Walvis Ridge volcanic provinces. The tectonic evolution records phases correlated with global events such as the Cenomanian–Turonian extinction event and episodes of ocean anoxia discussed in publications by International Commission on Stratigraphy and researchers from Massachusetts Institute of Technology and University of Cambridge.

Stratigraphy and sedimentology

Stratigraphic sequences in the trough include continental rift-related sediments, lacustrine shales, fluvial sandstones, and marine transgressive units comparable to successions described in the Niger Delta and Gabon Basin. Key stratigraphic units are often correlated with the Aptian to Santonian stages and include clastic successions deposited in syndepositional grabens, lacustrine organic-rich shales akin to those in the Apatite shales and carbonate layers similar to units in the Benin Formation region. Sediment provenance studies reference hinterland sources such as the West African Craton and the Cameroonian Highlands with detrital zircons linked to cratonic terranes studied at the University of Oxford and Stanford University.

Structural features and volcanism

The trough exhibits half-grabens, accommodation zones, and major faults aligned with rift propagation pathways analyzed in seismic sections by Schlumberger and documented in papers from Society of Exploration Geophysicists meetings. Magmatic activity produced volcaniclastic units and basaltic flows related to the Cameroon Line and intrusions comparable to alkali basalt provinces of the East African Rift and the Ethiopian Traps in scale of mantle-derived magmatism. Structural inversion, reactivation of normal faults during later compressional phases, and strike-slip episodes related to plate reorganizations have been described in literature from Texas A&M University and CNRS teams.

Natural resources and economic geology

The trough hosts hydrocarbon-bearing strata, with exploration by Shell plc, Chevron Corporation, ExxonMobil, and Nigerian National Petroleum Corporation targeting organic-rich source rocks and reservoirs analogous to fields in the Niger Delta and Gabon. Mineralization includes occurrences of lead–zinc, barite, and industrial clays mined near Jos Plateau and artisanal extraction influenced by companies and agencies such as Ministry of Solid Minerals Development (Nigeria). Groundwater resources in aquifers underlie municipalities such as Makurdi and industrial zones tied to infrastructure projects by African Development Bank and World Bank initiatives. Economic assessments often appear in reports by Nigerian Chamber of Mines and academic studies at Ahmadu Bello University.

Paleontology and paleoenvironment

Fossil assemblages from lacustrine shales and fluvial deposits include plant remains comparable to Cretaceous floras documented in the Gabon Basin and vertebrate traces similar to those described from Wealden Group analogues; palynological studies link to taxa used by researchers at Natural History Museum, London and Smithsonian Institution. Paleoenvironmental reconstructions suggest fluctuating lacustrine to marginal-marine conditions influenced by global sea-level changes recorded by the International Geology Community and regional climate signals tied to Cretaceous greenhouse intervals studied at Paleontological Society meetings.

Environmental issues and human impact

Development and resource extraction have produced land-use change, sedimentation, and water-quality concerns monitored by agencies like the Nigerian Environmental Society and projects funded by United Nations Environment Programme. Artisanal mining on the Jos Plateau and petroleum operations near the trough raise contamination risks echoing cases reported by World Health Organization and Food and Agriculture Organization assessments. Infrastructure expansion along corridors connecting Makurdi to regional hubs influences biodiversity in ecosystems linked to the Gashaka-Gumti National Park and necessitates environmental impact studies by universities including University of Calabar and University of Nigeria, Nsukka.

Category:Geology of Nigeria Category:Rifts