The origin and peculiarities of the nigerian benue trough: Another look from recent gravity data obtained from the middle benue

Ajayi, C.O.; Ajakaiye, D.E.

doi:10.1016/0040-1951(81)90154-2

Cited by 60 publications

(19 citation statements)

References 13 publications

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“…This intrusive body is probably o f gabbroic composition on account of its inferred density o f about 2.90g ~m -~. Ajayi & Ajakaiye (1981) have also suggested the existence of some igneous intrusive bodies within the Benue Trough (an example between Nassarawa and Lafia, density 2.73 g ~m -~, top at about 0.5 km). Support for the presence of basic intrusive bodies can also be found from the results of geophysical studies over various rift systems such as the Baikal Rift, the Rift Valley in Kenya and Rhine Graben (Zorin 1971 ;Zorin & Rogozhina 1978;Zorin 1981;Zorin, Lysak & Golubev 1975;Searle 1969Searle , 1970Bosum & Hahn 1967, 1970Roche & Wohlenberg 1970).…”

Section: Discussion Of Results Of Interpretationsmentioning

confidence: 93%

“…Published results of gravity studies o n the Benue Trough are due to Cratchley & Jones (1965), Adighije (1979Adighije ( , 1981a, Artsybashev & Kogbe (1975) and Ajayi & Ajakaiye (1981). These authors have reported a central axial positive anomaly, flanked on either side b y elongated negative anomalies.…”

Section: E E N D E -mentioning

confidence: 96%

“…From a consideration of the available geological information and the gravity data, most of these authors (Cratchley & Jones 1965;Adighije 1981b;Ajayi & Ajakaiye 1981) interpreted the central positive anomaly over the Benue Trough in terms of the combined effect of (a) a zone of basic to intermediate intrusions occurring either within the basement o r within the sedimentary basin, (b) a shallow basement and a thin crust as an approximate compensation for topography and the sedimentary basin. Local positive anomalies were also interpreted as being due to the numerous minor intrusions which abound within the trough.…”

Section: E E N D E -mentioning

confidence: 99%

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Interpretation of aeromagnetic anomalies over the Lower and Middle Benue Trough of Nigeria

Ofoegbu

1984

Geophysical Journal International

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The results of an interpretation of aeromagnetic anomalies over the Lower and Middle Benue Trough of Nigeria are presented. Twodimensional interpretation of the anomalies shows that the anomalies are best interpreted in terms of basic intrusive bodies occurring either within the Cretaceous sediments or within the metamorphic basement or both. The model suggests that the intrusive bodies are of variable thickness and magnetization polarity, and may have been emplaced during different epochs of polarity. The model is in good agreement with interpretations of gravity and magnetic anomalies over similar structures elsewhere in the world.

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Section: Discussion Of Results Of Interpretationsmentioning

confidence: 93%

Section: E E N D E -mentioning

confidence: 96%

Section: E E N D E -mentioning

confidence: 99%

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Interpretation of aeromagnetic anomalies over the Lower and Middle Benue Trough of Nigeria

Ofoegbu

1984

Geophysical Journal International

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“…The southern flank of the Chad Basin which constitutes the Bornu Basin is bounded by Upper Benue Trough (Alalade and Tyson, 2010) ( Figure 1). The study area is in the north-eastern sector of the Bornu Basin covering Latitudes 12° 00' N -13° 30' N and Longitudes 12° 30' E -14° 00' E. Bornu Basin is part of a regional active tectonic setting with characteristic structures extending NW to the Air Mountains and SW to the Benue Trough (Ajayi and Ajakaiye, 1981). The Lake Chad Basin and its constituent Bornu Basin were classified as rift basins based on several evidences including presence of basement tensional force indicators, zig-zag fault patterns and lack of compressive features of the main rift event in Early Cretaceous -Tertiary (130 -96 Ma) (Avbovbo et al, 1986).…”

Section: Geological and Tectonic Backgroundmentioning

confidence: 99%

Integrated well log and 2-D seismic data interpretation to image the subsurface stratigraphy and structure in north-eastern Bornu (Chad) basin

Isyaku

Rust

Teeuw

et al. 2016

Journal of African Earth Sciences

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Structural and stratigraphic mapping within the Bornu Basin in north east Nigeria was commonly carried out using traditional field geological methods. However, such traditional approaches remain inadequate in the semi-arid region characterised by topographically flat areas and lack of continuous bedrock outcrops that are mostly concealed beneath sand cover. Previous studies in the northeastern part of the basin carried out using ditch cuttings from few wells and disconnected seismic data were largely inadequate and the resulting stratigraphic analyses were more often generalised. This paper presents an integrated structural and stratigraphic study of the basin using combined subsurface geophysical datasets. A Combined Log Pattern (CLP) method is a well log analysis, which utilises various well log data including gamma ray, resistivity, bulk density and sonic logs to identify lithology and stratigraphic boundaries of subsurface formations. This method is applied to constrain the subsurface stratigraphy of the northeastern part of the Bornu Basin bordering the Lake Chad. In addition to qualitative combined well log analysis, the time-depth relationship of the sonic log and seismic data was quantitatively determined by tying a well with an intersecting seismic section to validate the stratigraphic facies horizons identified. Four well log facies and their environments of deposition were characterised from the combined well log analysis of the different log types. It is discovered that the Cretaceous basement structural features controlled the deposition of overlying formations in the basin. Without intact core data, the shallower wells were discovered to have bottomed over subsurface horst features while deeper wells penetrated into the basal facies contained mainly within the grabens. Main subsurface structural lineaments in the area include NW-SE, NE-SW and NNW-SSE trending faults, which mainly formed the horst and graben features. Some stratigraphic formations described in previous generalised stratigraphic schemes for the Bornu Basin were herein not found in the northeastern part of the basin.

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“…Benkhelil (1982) also explained that the movements controlled both extensional and compressional phase of deformation observed within the Benue Trough. These movements might also be responsible for the normal and thrust faults mapped in the MBT by Ajayi and Ajakaiye (1981) and the thrust might have been responsible for folding of the sediments parallel to the axis of the trough. The Benue Trough is known for the occurrence of extensive igneous activities which took place in the lower Cretaceous.…”

Section: Introductionmentioning

confidence: 99%

Evidence of basement controlled faulting of cretaceous strata in the Middle Benue Trough, Nigeria from lineament analysis of gravity data

Awoyemi¹,

Hammed²,

Falade³

et al. 2017

Ife Journal of Science

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The Bouguer anomaly map of part of the Middle Benue Trough, Nigeria, was used to investigate the genetic relationship between the basement and intra-sedimentary structures in the study area. This was with a view to establishing the evidence of possible basement controlled faulting of the Cretaceous strata. Regional-residual separation of the anomalies was carried out to produce the gravity maps associated with crustal masses at deep and intermediate depth layers. The derived maps were further processed to produce Horizontal Gradient Magnitude (HGM) maps that were used to infer deep seated structures and structures existing at intermediate depth layer of the study area. HGM maxima of the anomaly at various altitudes of upward continuation were used to highlight the locations and dip directions of subsurface structures as controlled from deep to shallow zones. The results of this study showed that the structures at different depth layers dominantly trend in the same direction (N-S, NNE-SSW and NE-SW) and that the deep seated faults reflect structurally in the overlying sedimentary column. It was therefore concluded that basement faulting might have influenced the structures in the overlying sedimentary rocks.

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The origin and peculiarities of the nigerian benue trough: Another look from recent gravity data obtained from the middle benue

Cited by 60 publications

References 13 publications

Interpretation of aeromagnetic anomalies over the Lower and Middle Benue Trough of Nigeria

Interpretation of aeromagnetic anomalies over the Lower and Middle Benue Trough of Nigeria

Integrated well log and 2-D seismic data interpretation to image the subsurface stratigraphy and structure in north-eastern Bornu (Chad) basin

Evidence of basement controlled faulting of cretaceous strata in the Middle Benue Trough, Nigeria from lineament analysis of gravity data

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