A gravity study of the precambrian rocks in the malumfashi area of Kaduna State, Nigeria

Gandu, A.H.; Ojo, S.B.; Ajakaiye, D.E.

doi:10.1016/0040-1951(86)90227-1

Cited by 27 publications

(18 citation statements)

References 8 publications

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“…Large scale regional compressions were recorded in rocks of the Liberian, Eburnean and Kibaran agesaccompanied by metamorphism and migmatization. The regional prevalence of the orogeny continued during the Pan African but was later co-ended by the development of brittle deformational structures [7,8] through which granitic intrusive were extensively emplaced [9]. In the Jurassic, the high temperature and pressure regime stimulated the partial melting (anatexis) of the thermally less resistant felsic bands of the northern basement region; a non-orogenic process that resulted in the generation of felsic melts, and magmatic emplacement of the younger granite intrusives.…”

Section: Geologymentioning

confidence: 99%

Integration of Magnetic Residuals, Derivatives and Located Euler Deconvolution for Structural and Geologic Mapping of Parts of the Precambrian Gneisses of Ago-Iwoye, Southwestern Nigeria

Ariyo

Coker

Alaka

et al. 2020

GSE

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Ground based magnetic survey conducted between longitude 06O 55I 51IIN -06O 55I 54IIN and latitude 03O 52I 06IIE -03O 52I 4.8IIE (Olabisi Onabanjo University) remarkably revealed a consistent subsurface NW -SE structural azimuth of localized discontinuities within the shallowly buried heterogeneous basement rocks, which at exposed locations are composed of strongly foliated granite gneiss and migmatite-gneiss with veins and veinlets principally orientated in NNW -SSE direction. Magnetic survey of the area was preceded by site inspection to avoid metallic objects interferences. Field procedure in the area involved Cartesian gridding, base station establishment, data acquisition at gridded points, and repeated bihourly diurnal checks at the base station. At the processing stage, diurnal variation effect was aptly removed before subjection to Kriging (gridding). The gridded data was then prepared as input for Forward Fourier Filter Transform (FFT), which upon definition and implementation enabled Butterworth filtering of isolated ringing effects, reduction to the equator (RTE) for geomagnetic correction, and the use of Gaussian and Upward Continuation filtering for regional magnetic intensity trend determination. Removal of the regional magnetic intensity (RMI) from the total magnetic intensity (TMI) resulted in the derivation of the residual anomaly. Enhancement filters adopted for better resolution of the residual magnetic gradient include analytical signal (AS), tilt-angle derivative (TDR), vertical derivative deconvolution (VDD), and the first vertical derivatives (FVD). TMI and RMI values range between 32925nT -33050nT and 32935nT -333050nT respectively, while the residual gradient ranges between 15nT/m and 10nT/m; AS ranges between 0.28nT/m and 4.1nT/m; and TDR ranges from -1.4nT/m to 1.4nT/m. Source depth calculation estimated from power spectrum analysis and Euler deconvolution ranges between 1m and 15m. Composite overlay of magnetic maps revealed jointed and faulted zones within the area; exhibiting a NW-SE principal azimuth of Liberian orogenic impress, which are in consistence with the foliation direction of the jagged foliated bedrock with an estimated maximum overburden of about 15m. The structural significance of this area as a prospective hydro-geological centre, and as an undesirable spot for high-rise building has been accurately evaluated from research findings. Application of integrated geophysical approach, complemented by detailed geological studies may furnish greater information about the subsurface structural architecture.

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Section: Geologymentioning

confidence: 99%

Integration of Magnetic Residuals, Derivatives and Located Euler Deconvolution for Structural and Geologic Mapping of Parts of the Precambrian Gneisses of Ago-Iwoye, Southwestern Nigeria

Ariyo

Coker

Alaka

et al. 2020

GSE

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“…Late tectonic emplacement of granites and granodiorites and associated contact metamorphism accompanied the end stages of this last deformation. The end of the orogeny was marked by faulting and fracturing [8]. Anifowose [9] was of the opinion that the granitic emplacement was probably controlled by fractures within the basement, and also showed outcrop pattern indicating that the older granite cut across all other structures with sharp and chilled contact.…”

Section: Geologic Setting Of the Study Areamentioning

confidence: 99%

The Geology, Geochemistry and Petrogenetic Studies of the Precambrian Basement Rocks around Iworoko, Are and Afao Area, Southwestern Nigeria

Ayodele¹

2015

J Geol Geophys

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The geology, geochemistry and petrogenetic studies of the Precambrian basement rocks around Iworoko, Are and Afao Ekiti were carried out to determine their geochemical and petrogenetic characteristics. Three lithologies including migmatite-gneiss, granite gneiss and banded gneiss with a pegmatite dyke that occurred as an intrusion were recognized in the study area. A total of seventeen rock samples were collected from the study area which were described based on their field relationships. Ten fresh rock samples were later selected for geochemical analysis. The result of the geochemical analysis revealed that silica (SiO 2 ) is the most abundant major oxide when compared with other oxides present in all the rock samples analyzed with an average percentage composition of 66.31%. The average percentage composition of other oxides present in all the rock samples are as follows; (16.41%) Al 2 O 3 , (3.67%) Fe 2 O 3 , (0.25%) CaO, (4.28%) K 2 O, (3.53%) Na 2 O, (1.75%) MgO, (0.78%) P 2 O 5 , (0.54%) TiO 2 and (0.061%) MnO. The results of the trace and rare earth elements analyses revealed that Barium (Ba) is the most abundant with an average value of 328.7ppm compared to other trace and rare earth elements present in the rock samples. The high concentration of barium in the migmatite-gneisses of the study area revealed the radioactive nature of this lithology. Petrological and chemical data suggests a sedimentary protolith, probably greywacke for the migmatite gneiss, gneiss and banded gneiss in the study area which may have been derived from a continental environment. Keywords: Are; Afao; Iworoko; Lithologies; Geochemical plots; Statistics. INTRODUCTIONNigeria lies to the rest of the West Africa craton in the region of late Precambrian to Early Paleozoic orogenesis. The basement complex is made up of Precambrian rocks and the schist belts infolded in them. The Precambrian rocks of southwestern Nigeria is part of the Precambrian Basement complex of Nigeria, the Basement complex itself is made up of Gneiss-migmatite complex and the Pan African older Granite rocks. However, the lithologies in the study area include; migmatite-gneiss, granite-gneiss and banded gneiss. These rocks have undergone polycyclic deformation thereby causing the deformation of both the macro and micro structures. Secondary structures in rocks that can be used as clues to determine the geologic history of an area include; joints, folds, fractures and foliations etc. Some of these structures are not deformational but were formed at the same time the rocks were emplaced. A lot of literatures abound on the study of basement geology of Nigeria and its associated structures which include Anifowose et al (2007) who noted that joints ranging from minor to major ones are found in all the rock types, some of which are filled with quartz, feldspars or a combination of both. They lie generally in the NE-SW direction. Odeyem et al., (1999) also suggested that almost all the foliation exhibited by the rocks of southwestern Nigeria excluding the intru...

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“…Late tectonic emplacement of granites and granodiorites and associated contact metamorphism accompanied the end stages of this last deformation. The end of the orogeny was marked by faulting and fracturing (Gandu et al, 1986). Within the Basement Complex of Nigeria, four major units are distinguishable, namely: migmatite-gneiss-quartzite complex, schist belts, Pan-African granitoids, and undeformed acid and basic dykes (Dada, 2006).…”

Section: Geology Of Study Areamentioning

confidence: 99%

Rare Earth and Trace Elements Distribution in Sediments from River Gora in Minna Area, North-Central Nigeria: Implication for Provenance

Obaje¹,

Akpoborie²,

Ugbe³

et al. 2015

ESR

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A gravity study of the precambrian rocks in the malumfashi area of Kaduna State, Nigeria

Cited by 27 publications

References 8 publications

Integration of Magnetic Residuals, Derivatives and Located Euler Deconvolution for Structural and Geologic Mapping of Parts of the Precambrian Gneisses of Ago-Iwoye, Southwestern Nigeria

Integration of Magnetic Residuals, Derivatives and Located Euler Deconvolution for Structural and Geologic Mapping of Parts of the Precambrian Gneisses of Ago-Iwoye, Southwestern Nigeria

The Geology, Geochemistry and Petrogenetic Studies of the Precambrian Basement Rocks around Iworoko, Are and Afao Area, Southwestern Nigeria

Rare Earth and Trace Elements Distribution in Sediments from River Gora in Minna Area, North-Central Nigeria: Implication for Provenance

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