A gravity interpretation of the Liruei Younger Granite Ring Complex of Northern Nigeria

Ajakaiye, D.E.

doi:10.1017/s0016756800052274

Cited by 22 publications

(3 citation statements)

References 6 publications

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“…Situated within the Nigerian younger granite province (Figures 1 and 2), the studies were mainly carried out because of the economic importance of some of the ring complexes in the area. The earliest gravity surveys were used to delineate and provide information about the ring complexes [6]- [10]. However, the studies have failed to provide information on structural setting because of the sparse station density of the surveys; which additional data set would have provided.…”

Section: Introductionmentioning

confidence: 99%

An Interpretation of Structures from the Aeromagnetic Field over a Region in the Nigerian Younger Granite Province

Raimi¹,

Dewu²,

Süle³

2014

IJG

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An interpretation of high resolution aeromagnetic data was carried out to provide new information about the study area. Located between latitude 10˚30'N and 11˚00'N and longitude 8˚30'E and 9˚00'E, the interpretation revealed previously unknown folds and magnetic anomaly with a signature that is similar to those associated with ring complexes in the study area but without the surface manifestation that is associated with the complexes. Qualitatively interpreted as unexposed ring complex, the magnetic anomaly is underlain by cross-over of major lineaments; implying presence of weak zone that probably allowed the volcanic eruption that initiated the emplacement of the source of the anomaly. A depth that ranges from outcrop to 1200 m and from outcrop to 1800 m is respectively suggested for the unexposed ring complex and folds by the Euler deconvolution results.

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Section: Introductionmentioning

confidence: 99%

An Interpretation of Structures from the Aeromagnetic Field over a Region in the Nigerian Younger Granite Province

Raimi¹,

Dewu²,

Süle³

2014

IJG

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“…Mineralogically and Geochemically, the Younger Granite ring complexes of Nigeria have been studied by the likes of Bowden [6][7][8][9][10][11][12][13][14][15]. Geophysically, the likes of Ajakaiye [16,17] Kogbe [18] and Etim [19] have made useful contributions in studying the ring complexes of Nigeria. Structurally, Ike, Abaa, Turner and Odia [5,11,20,21] have carried out worthwhile researches on the ring complexes.…”

Section: Introductionmentioning

confidence: 99%

Improved Mapping of the Structural Disposition of Some Younger Granite Ring Complexes of Nigeria Using High Resolution Aeromagnetic Data

Sabinus¹,

A²,

N³

et al. 2018

J Geol Geophys

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Surface and subsurface structural interpretation over a part of the Younger Granite province of Northern Nigeria using Aeromagnetic data was carried out to demonstrate the use of recently available high resolution aeromagnetic data in mapping precisely the Younger Granite. State of the art software packages were used in data reduction, processing/analysis and interpretation. Results of the aeromagnetic study show that the distinct magnetic anomalies clearly revealed in the area coincide spatially with outcropping ring complexes. Apart from outcropping ring complexes, some ring complexes without surface exposures (unexposed ring complexes) were also delineated. One of such ring complexes was studied in greater details and its lateral dimensions with that of the adjoining ring complexes were better resolved. The unexposed ring complex was found to have a surface area extent of approximately 169.5 km 2 which is similar to that of Ririwai (180 km 2), Banke (128 km 2), Kudaru (174 km 2) and Zuku (121 km 2). The results of the 3D Euler solutions indicate that the depths of the ring complexes range from outcrop to 1800 m. For the inferred unexposed ring complex, the depth ranges from 5 to 1200 m. The Younger Granites show low Source Parameter Imaging (SPI) depth values of about 4 km below the sea level indicating deeper magnetic sources. Three (3) profiles drawn along the NE-SW, NNW-SSE and E-W directions on the Analytic Signal map of the study area gave an overburden thickness of less than 20 m that masked the unexposed ring complex with its mappable root situated at approximately 200 m below the sea level. The Ririwai, Tibchi, Banke, Amo, Kudaru and Zuku ring complexes have outcrops of approximately 1300 m, 950 m, 920 m, 1400 m, 1150 m and 1220 m respectively above mean sea level with their mappable roots situated at approximately 400 m, 180 m, 400 m, 800 m, 10 m and 300 m respectively below the sea level. It delineated numerous lineaments as structural features whose major trend is along the NE-SW direction. It was equally observed that the ring complexes of Northern Nigeria display diverse surface plans/shapes and exhibit both inward and outward dipping structural orientations with depth. The likely reason for the unexposed nature of the newly proposed ring complex could be as a result of partial subsidence of the enclosed block on which the extrusive edifice of the central volcano originally rested probably occasioned by excess space (much subsurface accommodation) for continuously rising magma within the country rock. Its geometry is supportive of this assertion as it revealed majorly outward dipping trend with depth along different axes. Another reason could be due to incomplete fluidization along the already formed ring fracture and poor assimilation of the country rock by the fluidizing agent amidst a slow/near quiescent piece meal stopping process during the central granite intrusion phase which usually marks the end of ring complex formation. Finally, this research has demonstrated the efficacy of aeromagneti...

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“…The Younger Granite Ring Complexes (YGRC) in Figure 1 constitutes a major subdivision within the Basement Complex rocks of Nigeria [1][2][3][4]. There is sufficient information which indicates that the YGRC province has some of the best examples of granitic ring complexes in the world.…”

Section: Introductionmentioning

confidence: 99%

A Bibliography of Geological Studies on the Younger Granites Ring Complexes of Nigeria: 1951-2015

Aminu¹,

Bu²,

Ma³

2017

Oil Gas Res

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A bibliography of important geological studies on the Younger Granites Ring Complexes (YGRC) of Nigeria was conducted over a 64-year period: 1951-2015. The study presents a comprehensive list of primary sources of geological information on the study area which are both useful for present and future research. Based on the study, it was found that a total of 89 documents were produced and published on YGRC of Nigeria in various scientific journals around the world emphasizing different aspects of the geology of the study area. It was found that in the 26 years out of 64 years of study, no literature was published on the YGRC of Nigeria. The study also show that the foundational literature on the geology of the YGRC of Nigeria were conducted by British geologists and miners in the early part of the 20th century after the discovery of tin mineralization. Later studies were conducted by active participation of indigenous scientists from various universities and research organizations in Nigeria and Africa. Based on our findings, we categories the literature on the YGRC of Nigeria into three main groups-early, later and present day studies. Studies conducted in the early periods of geological research focused mainly on appraising and characterizing the geology, while later studies involved relatively more detailed scientific investigations using different geophysical and geochemical methods to aid in mineral exploration. In the present day, studies the literature has focused mainly on environment, geo-medicine, advanced geophysical analysis, satellite imagery for structural studies, Ta-Nb mineralization, etc.

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A gravity interpretation of the Liruei Younger Granite Ring Complex of Northern Nigeria

Cited by 22 publications

References 6 publications

An Interpretation of Structures from the Aeromagnetic Field over a Region in the Nigerian Younger Granite Province

An Interpretation of Structures from the Aeromagnetic Field over a Region in the Nigerian Younger Granite Province

Improved Mapping of the Structural Disposition of Some Younger Granite Ring Complexes of Nigeria Using High Resolution Aeromagnetic Data

A Bibliography of Geological Studies on the Younger Granites Ring Complexes of Nigeria: 1951-2015

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