3 research outputs found
SEDIMENTOLOGICAL AND PALEODE POSITIONAL STUDIES OFROCKS WITHIN THE MIDDLE BENUE TROUGH
No full textPrevious studies were focused on Albian to Turonian sediments of the middle Benue Trough, which lies within Keana and Awe sheet 232 NW respectively. The present study extends to areas around Lafia town (Sheet 231NW) whose sediments range from Albian to Maastrichtian. Detailed field mapping on a scale of 1:50,000 was carried out and during this exercise, lithostratigraphic successions in the study area was established. Stratigraphic study of the area indicates the occurrence of three formations namely; the fluvial Lafia Formation, the shallow marine Awgu Formation and the transitional Awe Formation. 12 samples were collected for granulometric analysis and 8 samples for Petrographic analysis. The Lafia Formation consists of ferruginous sandstone capping the section, clay and clayed intercalated with sands at the base. Petrography and sieve analysis revealed that the Ferruginous sandstone ranged from fine to medium grain. It is moderately sorted, strongly fine skewed and is subarkosic arenite. More than 60 % of the crystals are monocrystalline which is indicative of igneous provenance. The Awe Formation consists of fine-grained white sandstone, with some intercalations of white clay and laminated shale. The sandstones are fine-grained and poorly-moderately sorted which coupled with the bivariate plot that indicates a transitional condition between shallow marine and fluvial systems. The Awgu Formation consists of sandstones that are fine grained, very poorly sorted and strongly fine-skewed. The presence of ostracodes, echinoderms, and ammonites within the shaley limestone of the Awgu Formation is indicative of marine environment
Geoelectric investigation for aquifer characterization in Boi and Environs, Bauchi State, Northeast, Nigeria
No full textA total of thirty eight (38) Vertical Electrical resistivity Sounding (VES) were used to characterize aquifers in Boi and its environs, Bogoro Area of Bauchi State, Northeastern, Nigeria. The purpose of the study is to characterize the aquifer system in the area using Schlumberger configuration. Because there are multiple failed wells and boreholes in the vicinity, the research is justified. A total of 38 vertical electrical sounding (VES) were carried out, with a maximum electrode spacing of 100 m. The sounding curves acquired were three layer earth models, and the curve types were H, Q, A, and K respectively. The following lithologies were discovered in the area: topsoil with a resistivity of 81ῼm to 264.21ῼm and a thickness of 0.56m to 3.77m, laterite with a resistivity of 526.43ῼm to 999.71ῼm and a thickness of 1.93m to 3.47m, weathered/fracture basement with a resistivity of 10.62ῼm to 238ῼm and a thickness of 2m to infinite depth, and the fresh basement with a resistivity of 1000.33ῼm to 1821ῼm. The longitudinal conductance (S), transverse resistance (T), reflection coefficient (RC), and resistivity contrast (FC) were used to assess the area's groundwater potentials. The area's aquifer protection capacity found to be moderate, weak, and poor, while the groundwater potentials categorized as high, medium, low and very low. According to the results of the evaluated parameters, the area has a predominantly good to moderate groundwater potential. The numerous occurrences of failed/aborted boreholes in the area could be linked to a variety of factors, including poor data quality, lack of technical know-how, incorrect point selection, and poor drilled hole development, all of which are common in Basement Complex terrains. The VES 5 and 10 results showed a dramatic decline in resistivity, indicating that the water likely heavily polluted, particularly by anthropogenic chemicals, or that it was an ancient dumpsite
Petrographic Studies of Migmatite-Gneiss, Quartzites and Pegmatites Complex in Crusher Area of Lokoja, Kogi State, Nigeria
No full textThe studied Area is situated in Lokoja Local Government Area of Kogi state, this forms part of the Lokoja sheet on latitudes 07°49'N to 07°51'N and longitude 006°38E to 006°40'E and covers an area of 200km2 on a scale of 1: 50,000. The study area is situated in the southern Bida Basin and the Basement complex of Nigeria. However, the major rocks encountered during the fieldwork was migmatitegneiss, porphyroblastic gneiss and pegmatite which is the parts of the migmatite-gneiss complex of the Nigerian Basement. Laboratory analysis (thin section) was conducted to determine the mineralogical composition of the rocks, the minerals include quartz, feldspars, micas and opaque minerals. The research area is characterized by overflowing groundwater which supplies streams and rivers for agricultural and domestic usage. Economically, the major economic minerals of the rocks include feldspar, quartz and micas. The feldspars if in large quantity will be mined for ceramic factories for the production of ceramics, tiles and fillers and enhancer in paint, plastic and rubber. Large clasts of quartz also occur in the pegmatite and can be mined and used to produce abrasive minerals. Quartz can be used in railway blasts, they serve as decorative stones, and they are also used in covering of walls and roofing. The quartzite and gneissic rocks in the study area can be blasted and cut into various sizes and shapes and thus be used for road construction and building design. A variety of uses for metamorphosed gneiss exist in buildings, such as ornamental stone applications etc
