Geochemical discrimination of newly discovered rare-metal bearing and barren pegmatites in the Pan-African (600 ± 150 Ma) basement of northern Nigeria

Garba, I.

doi:10.1179/037174503225011270

Cited by 46 publications

(60 citation statements)

References 18 publications

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“…This slight to sharp contrast in the values of some of the whole rock and eluvial soils for the alumina content of this study area in addition with other rare metal characteristics, confirms the complexity of the pegmatite type. These values are comparable to those observed for mineralized pegmatites of Nigeria, (Garba, 2003;Okunlola, 2005). (v) Albite type.…”

Section: Resultssupporting

confidence: 87%

“…These have led to concentration of study on discrimination of the pegmatites into rare metal mineralized and barren ones in order to elucidate modes and features of mineralization (Matheis, 1981;Matheis et.al. 1982;Kuster, 1990;Garba, 2003). Recent studies by Okunlola, (2005) also defined the metallogeny of the rare metal Ta-Nb pegmatites of Nigeria outlining seven (7) broad fields namely Kabba-Isanlu, Ijero-Aramoko, Keffi-Nasarawa, Lema-Ndeji, Oke Ogun, Ibadan-Oshogbo and Kushaka-Birnin Gwari.…”

Section: Introductionmentioning

confidence: 99%

“…The Oro pegmatites occurrences which are members of the Kabba-Isanlu field occurrences have therefore been studied with the aim of elucidating their petrography and geochemical features and thus understanding their origin economic potentials in relation to other fields. Researchers like Moller and Morteani (1987), Cerny (1989), Kuster (1990), Garba (2003) have contributed to a better understanding of southwestern and northern Nigeria pegmatite bodies distinguishing between the barren and rare metal bearing pegmatites and documenting that the pegmatites are not confined to the earlier proposed 400 km long NE-SW trending belt stretching from Wamba area (near Jos plateau) to Ilesha area. Elueze et.…”

Section: Introductionmentioning

confidence: 99%

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Petrography and Petrochemical Characteristics of Rare Metal Pegmatites around Oro, Southwestern Nigeria

Abiola¹

2014

Asia Pacific Journal of Energy and Environment

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Petrographic and geochemical evaluation of pegmatite bodies occurring as discontinuous dykes have been studied in Oro area of southwestern Nigeria, with a view to determine the compositional characteristics that may be related to Ta-Nb mineralization potentials. They are found intruding semi discordantly, the older assemblages of quartz mica schist and granite gneiss. A total of twenty-eight samples comprising whole rock pegmatites and eluvial soils were analyzed for major, trace and rare earth elements using (ICP-AES) geochemical method which show the pegmatite samples to be generally highly siliceous with SiO2 values ranging from (71.49-97.77%) with an average of 86.43% in the whole rock samples, and it also ranges from (41.88-57.99%) with an average of 48.43% in the eluvial soil samples, while Al2O3 content is as high as 25.87% in the eluvial soil samples and 6.86% in the whole rock samples depicting the complexity of the pegmatite rock. Variation plots of K/Rb versus Rb, Ta versus Rb, Ta versus Nb, Ta versus K/Cs, Ta versus Cs+Rb and Ta versus Cs discriminant plot indicate the potentials of rare metal mineralization.

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Section: Resultssupporting

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Petrography and Petrochemical Characteristics of Rare Metal Pegmatites around Oro, Southwestern Nigeria

Abiola¹

2014

Asia Pacific Journal of Energy and Environment

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“…Results of the rock ages showed that the pegmatities' emplacement in southwestern Nigeria occurred mainly after the peak of the Pan-African orogenic event in this area.The end of the Pan-African tectonic event is marked by a conjugate fracture system of the strike-slip faults (Ball, 1980). Gold and rare-metal pegmatites' mineralization is closely associated with the fractures in the Pan-African belt (Kuster, 1990;Ekweme and Matheis, 1995;Garba, 1992Garba, , 2003. The Ijero study area lies within latitudes 7 0 48' 36'' to 7 0 50' 06'' and longitudes 5 0 03' 54'' to 5 0 05' 42''.…”

Section: Local Geologymentioning

confidence: 99%

Major Oxides Geochemistry of Tourmaline from Selected Gem-Mineral Deposits in Southwestern Nigeria

Olatunji

Jimoh

2018

Asia Pac. j. energy environ.

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Tourmaline occurs in associations with other gem minerals such as beryl, topaz, garnet and kunzite alongside rock-forming minerals like quartz, feldspar and muscovite in various gem mineral deposits across southwestern Nigeria. These occurrences of tourmaline in varieties of colors resulting from its range in chemical compositions remain puzzling, more so when there is a lack of sufficient information on the chemistry of the Nigerian tourmalines. This study is aimed at the major oxides investigation of tourmalines from selected gem-mineral deposits in southwestern Nigeria and how the chemistry can be used to infer their environment and processes of mineralization. A total of 22 differently colored tourmaline samples obtained from different locations in southwestern Nigeria were prepared and analyzed, using the inductively coupled plasma -mass spectrometry (ICP-MS) to determine the elemental constituents. Komu and Ijero-Ekiti, being the two areas with highest concentrations of the study samples were specially chosen and mapped, at least to reveal the geology of some gem mineral deposits in the area. Results of the geochemical analysis of the tourmaline samples showed enrichment in SiO2 and Al2O3, but depletion in the remaining major oxides. However, a few of the tourmaline samples showed unusual enrichment in CaO, revealing the fact that the samples have crystallized from highly fractionated melt. The major oxide compositions of the tourmalines exhibited wide and distinct variations, especially in SiO2, Al2O3 and CaO, indicating magmatic origin for the southwestern Nigerian tourmalines. Similarly, the strong negative correlations observed between CaO and the oxides Al2O3, Na2O, K2O and SiO2 in the tourmaline samples, coupled with the relatively high Fe/Fe+Mg ratio, averaging 0.89,clearly reinforced magmatic sourcing for the tourmalines. Almost all the southwestern tourmaline samples plot in the predefined field of Li-rich granitoidpegmatites and aplites in the Al-Fe-Mg and Ca-Fe-Mg plots. Southwestern Nigerian tourmalines are thus magmatic in origin with their chemistry reflecting control by host rocks and granitic-pegmatitic fluid. The study also revealed that the intensity of coloration in tourmalines can be linked to the presence or otherwise of iron concentration. The iron content varies directly and proportionately with the depth of color in the greens, and inversely in the pinks and reds.

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“…Central Nigeria is part of an Upper Proterozoic mobile belt extending from Algiers across the southern Sahara into Nigeria, Benin, and the Cameroun. This Pan-African belt continues into Northeast Brazil where analogous rare-metal mineralized pegmatites are also known [5,[9][10]. Bordered to the west by the West African Craton (stabilized around 2Ga) the Pan-African belt itself is made up of gneiss-migmatites, metasediments, and metavolcanics that have been subjected to polycyclic metamorphism and emplacement of igneous rocks.…”

Section: Introductionmentioning

confidence: 99%

The geology and petrography of the Arikya Tsauni quartzite and pegmatite ridges, central Nigeria

Tersoo¹,

Isah²

2018

EESRJ

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The Study area is located in Arikya Tsauni, in Lafia East Local Government Area of Nassarawa State. Bounded by latitude 08 0 46ʹ 44 ʺ N to 08 0 48ʹ 44 ʺ N and longitude 008 0 38ʹ 34 ʺ E to 008 0 41ʹ 14 ʺ E, it forms part of Wamba sheet 210NW. The study addressed the geology and petrography of the study area. The geological mapping indicated five (5) rock types namely, migmatite, foliated gneiss, granite gneiss, quartzite and pegmatite. The quartzite and pegmatite ridges are striking in NE-SW direction. Petrographic studies showed the presence of the various rock forming minerals which include -plagioclase, quartz, biotite, microcline, hornblende and opaque minerals as observed within the field of view under plane and crossed polarized light. Careful study of the pegmatite in the study area has clearly shown that they are barren. The structural features of the study area were seen as foliation, joints, comb structures, veinlets and faults, where the major structural trends were in the NE-SW, NNE-SSW directions, corresponding to that of the underlying Basement Complex. Economically, the study area portend the ability to host quarries, as the rocks would serve as major source of construction materials.

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Geochemical discrimination of newly discovered rare-metal bearing and barren pegmatites in the Pan-African (600 ± 150 Ma) basement of northern Nigeria

Cited by 46 publications

References 18 publications

Petrography and Petrochemical Characteristics of Rare Metal Pegmatites around Oro, Southwestern Nigeria

Petrography and Petrochemical Characteristics of Rare Metal Pegmatites around Oro, Southwestern Nigeria

Major Oxides Geochemistry of Tourmaline from Selected Gem-Mineral Deposits in Southwestern Nigeria

The geology and petrography of the Arikya Tsauni quartzite and pegmatite ridges, central Nigeria

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