Geochemical characteristics of mesothermal gold mineralisation in the Pan-African (600 ± 150 Ma) basement of Nigeria

Garba, I.

doi:10.1179/037174503225003143

Cited by 43 publications

(32 citation statements)

References 25 publications

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“…Some of the important fault systems in Nigeria are the Ifewara, Zungeru, Anka and Kalangai fault systems. They are interpreted to have resulted from transcurrent movements (Garba 2003;Eze et al 2011). Of these, only the Ifewara fault is located in the region of this study.…”

Section: Geological Settingmentioning

confidence: 99%

Spectral analysis of aeromagnetic data for geothermal energy investigation of Ikogosi Warm Spring - Ekiti State, southwestern Nigeria

et al. 2014

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Background: Aeromagnetic data of the Ikogosi warm spring region was used to calculate the basal depth of the magnetic layer (Curie point depth) in the region. The warm spring issues from a crossing of fractures from a metasedimentary suite of Effon Psammite formation which form part of the Precambrian basement complex in Nigeria. Method: The adopted computational method transforms the spatial data into the frequency domain and provides a relationship between radially average power spectrum of the magnetic anomalies and the depths to the respective sources. Heat flow density and equivalent depth extent of heat production from radioactive isotopes in the area were also evaluated. Results: The average Curie point depth for the Ikogosi warm spring area is 15.1 ± 0.6 km and centres on the host quartzite rock unit. The computed equivalent depth extent of heat production provides a depth value (14.5 km) which falls within the Curie point depth margin and could indicate change in mineralogy. The low Curie point depth observed at the warm spring source is attributed to magmatic intrusions at depth. This is also evident from the visible older granite intrusion at Ikere -Ado-Ekiti area, with shallow Curie depths (12.37 ± 0.73 km). Conclusions: Results indicate that the area is promising for further geothermal explorations.

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Section: Geological Settingmentioning

confidence: 99%

Spectral analysis of aeromagnetic data for geothermal energy investigation of Ikogosi Warm Spring - Ekiti State, southwestern Nigeria

et al. 2014

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“…The gold mineralizing fluids, based on Na 2 O/Al 2 O 3 -K 2 O/Al 2 O 3 discrimination diagrams and inter-lithophile elements ratios are interpreted to be of metamorphic origin (Danbatta et al, 2009). The mineralized concordant veins are generally short, not exceeding half a kilometre of strike length and trace metal concentration in altered wall rock reported by Garba (2003) of 647-5410 ppm Cu; 7550-22600 ppm Pb; 1.5-8.6 ppm Ag and 123-6320 ppb Au show that the ores are very rich in lead and copper minerals, mostly galena which was observed during field work and identified in the contaminated soil using SEM ( Figure 2) and also chalcopyrite. Figure 2.…”

Section: The Study Areamentioning

confidence: 79%

“…Gold in this area is hosted by schists, phyllites and quarzites related to sub-regional structural elements subsidiary to the Anka fault (Garba, 2003) and metaconglomerates (Russ, 1957). The gold mineralizing fluids, based on Na 2 O/Al 2 O 3 -K 2 O/Al 2 O 3 discrimination diagrams and inter-lithophile elements ratios are interpreted to be of metamorphic origin (Danbatta et al, 2009).…”

Section: The Study Areamentioning

confidence: 99%

In Vitro Bioaccessibility of Lead in Artisanal Mining Contaminated Soils and Sediments from the Anka Area, NW Nigeria

Waziri¹,

Andrews²

2013

ESR

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The gastric bioaccessibility of Pb was investigated in soils and sediments from five villages in the Anka area of north-western Nigeria which has been adversely affected by artisanal mining of gold from lead-rich ores. In vitro bioaccessibility experiments were used to determine the extractability of Pb in order to evaluate the human health risk, especially to children below the age of five. The concentration of Pb in the simulated gastric fluids ranges from ~ 198 to 41740 µg, with corresponding human bioaccessible fraction between ~ 29 and 100% (mean, ~ 60%). Chemical daily intake (CDI, µg/Kg/Day) values of between 111 and 41587 are generally very high compared to the tolerable daily intake (TDI) of ~ 3.6 µg Pb/Kg/Day. The high bioaccessibility is a result of high total concentration of Pb and the presence of highly soluble carbonate and oxide minerals in the ores. These results point to the very adverse health effects likely to result from incidental hand-to-mouth ingestion of soils by children in the affected villages. The results further show that the low pH of gastric juices enhances the extraction of Pb. Given the likelihood of sub-nutrition in the affected communities, characterized by skipping of meals, which can result in lowering of the pH over extended periods, the risk of Pb poisoning is further increased. This study was based on a hand-to-mouth ingestion scenario alone, but as other exposure routes, such as eating improperly washed vegetables and inhalation of dust are possible, the risk might even be higher. This, along with the fate of extracted Pb in the intestinal environment may need to be evaluated in order to fully quantify the bioavailability of Pb in the area.

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“…Gold mineralization is present in alluvial and elluvial placers and primary veins from several parts of supracrustal (schist) belts in the northwest and southwest of Nigeria [5]. Also, most of the NW Nigeria schist belts that have been studied are polymetallic and are endowed with mineralization such as gold [6,7,8], Banded Iron Formation [9,10], marble [10], manganese [12,13] etc associated with them.…”

Section: Introductionmentioning

confidence: 99%

Geology and Gold Mineralization around Kutcheri, northwestern Nigeria

Amuda¹,

Danbatta²,

Najime³

2013

IOSRJAGG

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Geochemical characteristics of mesothermal gold mineralisation in the Pan-African (600 ± 150 Ma) basement of Nigeria

Cited by 43 publications

References 25 publications

Spectral analysis of aeromagnetic data for geothermal energy investigation of Ikogosi Warm Spring - Ekiti State, southwestern Nigeria

Spectral analysis of aeromagnetic data for geothermal energy investigation of Ikogosi Warm Spring - Ekiti State, southwestern Nigeria

In Vitro Bioaccessibility of Lead in Artisanal Mining Contaminated Soils and Sediments from the Anka Area, NW Nigeria

Geology and Gold Mineralization around Kutcheri, northwestern Nigeria

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