Evaluation of Kaolin Mineral Emplacement at Amaihe-Ukpor, Anambra Basin, Southeastern Nigeria Using Spatial Layer Electrical Resistivity Tomography

Egwuonwu G.N., Nwafor E.K., Kalu U.E.
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Abstract

Spatial layer Resistivity tomography was carried out at a Kaolin Mining site in Amaihe-Ukpor of Anambra Basin, southeastern Nigeria. The tomograms were obtained at various depths with the aim of assessing the depths of emplacement of the Kaolin at the site. Firstly, apparent resistivity data Schlumberger-B electrode configuration was obtained from Seventy-five (75) Vertical Electrical Tomography (VES) along 6 transverses at the site. Using the VES data, tomographic plots of spatial distribution of the Kaolin minerals at depths were obtained. Interpreted tomograms showed the occurrence of Kaolin minerals bearing apparent resistivity values in the range of about (900 - 28,900 Ωm) occurrence within the depth range of 0.5 m at layer 2 to 115 m at layer 4 of the site. The tomograms show that layers 2 to 5 indicate traces of the occurrence of Kaolin, layers 2, 3 and 4 particularly showed prominence of the Kaolin. Layers 1 and 6 show no trace of the Kaolin formation enrichment on them. The spatial layer tomograms showed that the prominence of the Kaolin remains at the site occur mostly at the northern and southern zones of the surveyed site. Further mining at the site could lead to tertiary exploitation of the mineral. The site is therefore in threat of gross depletion of the environment. Hence, there is need for suspension of the ongoing extraction of the Kaolin at the site to give room for deposition and sufficient formation of the target mineral.
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利用空间层电阻率层析成像技术评价尼日利亚东南部Anambra盆地Amaihe-Ukpor高岭土矿位
在尼日利亚东南部Anambra盆地Amaihe-Ukpor的一个高岭土矿区进行了空间层电阻率层析成像。层析成像是在不同深度获得的,目的是评估高岭土在现场的就位深度。首先,通过现场6个横截面的75(75)个垂直电断层扫描(VES)获得了斯伦贝谢- b电极配置的视电阻率数据。利用探测数据,获得了深部高岭土矿物空间分布层析图。层析成像解释显示,高岭土矿物的视电阻率值约为(900 ~ 28900 Ωm),分布在2层0.5 m ~ 4层115 m的深度范围内。层析图显示,第2 ~ 5层有高岭土的赋存痕迹,第2、3、4层高岭土突出。第1层和第6层未见高岭土地层富集痕迹。空间层析成像显示,高岭土遗迹的突出主要出现在测点的北部和南部。该地点的进一步开采可能导致该矿物的第三次开采。因此,该地点面临着环境严重枯竭的威胁。因此,需要暂停现场正在进行的高岭土提取,以便为沉积和目标矿物的充分形成提供空间。
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