Assessment of Bedrock Depth Utilizing Vertical Electrical Sounding (DDBR)
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This study is aimed at evaluating the depth to bed rock around Liji area of Gombe Northeastern Nigeria. The area covers 18 (km) CIRCUMFLEX 2and lies between Latitudes 11Degree11ʹ20.4ʺ, and 11Degree14′ 37.4″E and Longitudes 10Degree16′ 20.8″, and 10Degree19′ 16.0″N, (Gombe N.W Sheet 152). The study area consists of Basement rocks (Coarse grained Biotite Granite,), Aptian-Albian indurated Bima Sandstone, Gombe Formation and Mudrock. Ten (10) Vertical Electrical Sounding (VES) were profiled around Liji and environs, employing Schlumberger array with a maximum electrode separation of ABSlash2 = 100m to determine the depth to bedrock. The data obtained were processed and interpreted using Win Resist program. The results showed that seven (7) VES points (VES 1, 2, 3, 5, 6, 7 and 10) displayed three layers while the remaining (VES 4, 7 and 9) had four layers. The Geo-electric sections along profiles A-A’ and B-B’ revealed that the area is underlain dominantly by three layers, (top soil, weathered sandstone and basement). The first layer has a resistivity value ranging from 2.3 to 193.5 Omega m with a thickness that ranges from 0.4 to 7.1m. The second layer is weathered Sandstone with a resistivity range of 2.8 to 4607.6 Omega m and thickness of 0.8 to 7.3m while the third layer is Basement with resistivity value of 93.6 to 37356.9 Omega m with an infinite thickness. VES 4, 7 and 9 had four layers and the third layer represent the fresh Sandstone with resistivity ranges of 290.2Omegam to 4607.6 Omega m and a thickness of 3.3m to 17.3m while the forth layer in the respective three VES points is basement, having resistivity ranges of 3.1 Omega m to 15717.4 Omega m with an infinite thickness. At the end of the study, the results revealed that Basement rocks are present at VES 1, 2, 4, 5, 6, 7 and 10 at the depth of 10m, 9.3m, 19.7m, 6.5m, 5.7m, 14.7m and 24.0m respectively with an infinite thickness, therefore these serves as the depths to be removed to reached the top of the basement for the construction of a sound foundation.
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