Crustal Structure of the Benue Valley Area (Nigeria)

Artsybashev, V.A.; Kogbe, C.A.

doi:10.1007/bf01820672

Cited by 20 publications

(4 citation statements)

References 2 publications

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“…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%

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: E E N D E -mentioning

confidence: 96%

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

Ofoegbu

1984

Geophysical Journal International

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“…The Southern BT covers the Lower and Middle units of the Trough. The BT has been reported to have emanated from tensional fracture system with irregular subsidence along lines of weakness (Artsybashev and Kogbe, 1975). The Trough contains Cretaceous rocks whose ages date from the Middle Albian to Early Senonian epochs and filled with deltaic, estuarine, and marine sediments, with rare intrusions of basic alkaline lavas.…”

Section: Geological Settingmentioning

confidence: 99%

“…The Trough contains Cretaceous rocks whose ages date from the Middle Albian to Early Senonian epochs and filled with deltaic, estuarine, and marine sediments, with rare intrusions of basic alkaline lavas. The either side of the BT is bounded by granite and gneisses of probable lowermost Palaeozoic age, which make up the crystalline basement (Artsybashev and Kogbe, 1975).…”

Section: Geological Settingmentioning

confidence: 99%

Estimation of the sediment thickness beneath the Southern Benue Trough in Nigeria by using gravity and borehole data

Apeh,

Tenzer,

Pham

et al. 2023

Earth sci. res. j.

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Mapping the sediment-basement morphology represents a crucial part of the geophysical exploration of oil, gas, and mineral resources. In this study, authors estimated the sediment thickness in the area covering the Southern Benue Trough in Nigeria and parts of the Cameroon Volcanic Line using a high-resolution tailored gravity model together with sediment and bedrock samples taken from 113 logged boreholes. A 3-D inversion of the residual gravity data is done by applying a recently developed time-efficient gravity inversion software to determine a 3-D depth structure of the basement relief after regional-residual gravity separation. The estimated depths of the sediment-basement based on a 3-D gravity data inversion are compared with the measured sediment thickness data from drilling profiles to optimally select the gravity inversion parameters, particularly the mean sediment depth, and density contrast. Our numerical result indicates that the sediment thickness within the Southern Benue Trough study area and parts of the Cameroon Volcanic Line vary from 0.8 to 5.5 km, with a prevailing southwest trend of increasing sediment thickness while decreasing eastward. This trend closely mimics the known geological structure of the study area and generally agrees with localized estimates of the sediment thickness from previous studies. Moreover, the Bouguer gravity map of the study area exhibits a spatial pattern that indicates an existence of a high-density material, which could have led to the shallowing of sediments over and along the Abakaliki Anticlinorium. Based on these findings, the authors argued that these magmatic structures could influence hydrothermal fluid migration and might have entrapped enough sediments suitable for the maturation of mineral resources over time.

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“…The application of geophysical methods in the study of Benue trough geology has centered mainly on mapping of regional structures of the trough using mainly gravity method (Artsbachev and Kogbe, 1974;Adighije, 1981a), aeromagnetic interpretation (Ofoegbu and Onuoha, 1991). Mamah et al (2000) and Ugwu (2006) used resistivity/magnetic and Spontaneous potential methods to study Lead-Zinc veins in Ishiagu and Abakaliki areas respectively.…”

mentioning

confidence: 99%

Mapping Bedrock Topography using Electromagnetic Profiling

Ugwu¹,

Eze²

2010

Journal of Applied Sciences and Environmental Management

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ABSRACT: Electromagnetic profiling method was used in Echara Unuhu, within the Abakaliki Urban, to map the bedrock topography which also aids us to determine the position of the deepest fractured shale where a productive borehole will be constructed The area under study is within the Abakaliki Shales Geologic Formation. The rocks are packages of thinly layered olive green to dark gray blush black shale, which are frequently calcareous, subordinate fine-grained micaceous sandstone; micaceous siltstone, sandy shales and shelly limestone. Two-man portable Geonics EM 34-3 electromagnetic equipment was used in the profiling normal to the strike. The results show that typical conductivity value of the shallow bedrock (1.51-2.0m) lies between 22.1-53.7 mmho/m while conductivity values from 269-786mmohm/m indicate thicker/deeper (25-30m) fractures with higher moisture contents. Mapping of bedrock topography at Echara Unuhu enabled us to locate a point which on drilling produces good water yield; this technique is recommended for use in formations with similar characteristics @ JASEM

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Crustal Structure of the Benue Valley Area (Nigeria)

Cited by 20 publications

References 2 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

Estimation of the sediment thickness beneath the Southern Benue Trough in Nigeria by using gravity and borehole data

Mapping Bedrock Topography using Electromagnetic Profiling

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