Abstract
The lead-zinc deposit of Enyigba and its environs are localized in the cretaceous sedimentary rocks of the Albian Asu River Group in the Lower Benue Trough, Southeastern Nigeria. The Albian Asu River Group is made up of shale, siltstone, sandstone and limestone. The deposits were formed epigenetically through the crystallization of hydrothermal solutions and are localized within the fractures, hence the need to study the trend of the fractures in the rock unit where the mineral deposits are being hosted. In order to study the fractures, two units of the formation were identified and designated as units A and B. The ore field extends to about 3.7 km strike length with an average width of 5 m. From the detailed field mapping, the identified structures that control the mineralization are fold, fault and joint/fractures in which the fractures predominate. The total measured identified fractures is 503 in number and are represented in rose diagram, histogram and stereographic net which shows that they trend NW-SE and N-S directions, and dip SW-NE direction. Key words: Mineralization, stereographic net, shale, siltstone, sandstone, limestone, deposits.
Highlights
Enyigba district is located within Abakaliki and Ikwo Local Government Areas of Ebonyi State
The lead-zinc lode in the Enyigba district comprises of Enyigba, Ameri, Echara and Ameka (Figure1). These lodes are located within the Abakaliki anticlinorium in the Lower 4 Benue Trough
Mineralization occurs along a narrow belt of approximately 30 to 50 km wide and extends for about 560 to 600 km length of the Benue trough in Adamawa, Taraba, Bauchi, Plateau, Nasarawa, Benue and Ebonyi States (Figure 2) (Umar et al, 2011; Cratchley and Jones, 1965; Farrington, 1952)
Summary
Enyigba district is located within Abakaliki and Ikwo Local Government Areas of Ebonyi State. The lead-zinc lode in the Enyigba district comprises of Enyigba, Ameri, Echara and Ameka (Figure). The lead-zinc lode in the Enyigba district comprises of Enyigba, Ameri, Echara and Ameka (Figure1) These lodes are located within the Abakaliki anticlinorium in the Lower 4 Benue Trough. Mineralization occurs along a narrow belt of approximately 30 to 50 km wide and extends for about 560 to 600 km length of the Benue trough in Adamawa, Taraba, Bauchi, Plateau, Nasarawa, Benue and Ebonyi States (Figure 2) (Umar et al, 2011; Cratchley and Jones, 1965; Farrington, 1952). Orazulike (1994) noted the usage of galena as a cosmetic and fishing net weight by the native of Enyigba before the advent of the Britons
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