BENUE TROUGH PDF

Location[ edit ] Sketch map of Benue Trough The trough has its southern limit at the northern boundary of the Niger Delta , where it dips down and is overlaid with Tertiary and more recent sediments. The trough is arbitrarily divided into lower, middle and upper regions, and the upper region is further divided into the Gongola and Yola arms. The Anambra Basin in the west of the lower region is more recent than the rest of the trough, being formed during a later period of compression, but is considered part of the formation. During the Late Early to Middle Cretaceous, the basin subsided rapidly and was covered by the sea. Sea floor sediment accumulated, especially in the southern Abakaliki Rift, under oxygen-deficient bottom conditions. The other two arms continued to spread during the break-up of Gondwana , as South America separated from Africa.

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Location[ edit ] Sketch map of Benue Trough The trough has its southern limit at the northern boundary of the Niger Delta , where it dips down and is overlaid with Tertiary and more recent sediments. The trough is arbitrarily divided into lower, middle and upper regions, and the upper region is further divided into the Gongola and Yola arms.

The Anambra Basin in the west of the lower region is more recent than the rest of the trough, being formed during a later period of compression, but is considered part of the formation. During the Late Early to Middle Cretaceous, the basin subsided rapidly and was covered by the sea.

Sea floor sediment accumulated, especially in the southern Abakaliki Rift, under oxygen-deficient bottom conditions. The other two arms continued to spread during the break-up of Gondwana , as South America separated from Africa. As the continents were wedged apart, the trough opened up. When separation was complete, the southern part of Africa swung back to some extent, with the sediments in the Benue Trough compressed and folded.

The deposits in the Benue Trough were displaced westwards at this time, causing subsidence of the Anambra Basin. This may have been repeated several times, with the Benue Trough deformed between rifting episodes.

Helena in the Atlantic ocean. The first is prominent in the north of the trough, and contemporary with magmatism in Brazil, probably occurring during a period of crustal extension before the Atlantic started to open.

The second is found only in the south of the trough, and may belong to a period when the extension of the Atlantic had slowed down, ending with a period of compression.

The third and last period is also found only in the south of the trough, and may be related to an isostatic response to the earlier crustal thinning.

The faults extend into the ocean with the Chain and Charcot fault zones, and have their counterparts in northeastern Brazil. These are mined in Enugu State. Later, the deep layer of vegetation became buried under coarse sands.

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The Benue Trough and Economic Importance

The undulating plains of the interior low- lands The scarplands of south-central Nigeria The Sokoto plains Map of Nigeria showing the two types relief features- Uplands and lowlands All the lowlands in Nigeria are grouped into seven 7 category which I have listed above, however in todays article, we are going to consider a very important lowland in Nigeria which is the Benue trough. Definition of aTrough A trough is a narrow depression on the earth surface that extends over a distance. A trough could be a region on the surface of the earth that is characterised by relatively lower atmospheric pressure and it is often associated with fronts. A trough can bring about cloudy weather condition, precipitation and cold air within a specific area.

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Benue Trough

Najin The clays studies do not require addition of weighing additive such as barite because of their high iron content which made their density attain the require standard even without additives. The Yolde formation is indeed a transitional sequence between the continental Bima group and the marine deposits of the lower part of the Pindiga Formation. Porosity and permeability data of these potential reservoirs are very scarce. Geochemically, two groups of volcaniclastic rocks, are distinguished: Thin and thick blood films were prepared for microscopic examination. The origin of the Benue beneu has been a controversial subject. Particular attention is paid to eustatic sea level fluctuation especially during the period marked by accumulation of Azolla Beds under considerable desalination of surface waters in the basin.

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