RMZ â MATERIALI IN GEOOKOLJE

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366 Sunmonu, L. A., Adagunodo, T. A., Olafisoye, E. R., Oladejo, O. P.aquifer system, clay layers, the depthand thickness of aquifers, fissure orfracture location, and qualitatively estimatinglocal groundwater flow (Fitterman& Stewart, 1986; McNeill,1987; Olasehinde, 1989) and has beenadopted in this study. The most commonlyused geophysical technique forgroundwater exploration is electricalresistivity (Mazac et al, 1987) whichis aimed at identifying high conductivityanomalies, normally thought to bedue to deep weathering. Recent developmentsin geoelectrical data acquisitionand interpretation methodologyprovide electrical images of subsurfacefeatures. A properly calibrated electricalimage can be used to infer the aquiferconfiguration: depth, thickness,horizontal and vertical extent of theaquifers. Investigation involving detailgeophysical study for groundwater potentialin the area covered by this studyis presently non-existence. This exigencyinspired this study. Therefore,the primary objective of this study wasto determine the groundwater potentialand to identify suitable sites/locationsfor exploration of groundwater in industrialestate Ogbomoso, SouthwesternNigeria.Site descriptionThe studied area lies within the crystallineBasement Complex of Nigeria(MacDonald & Davies, 2000). It lieswithin latitude 08 0 06 ′ 07.4 ″ and 08 0 06 ′25.4 ″ and longitude 004 0 15 ′ 03.3 ″ and004 0 15 ′ 49.0 ″ . The study area is locatedat the outskirt of Ogbomoso SouthLocal Government and shares boundarywith Surulere Local GovernmentArea along old Oshogbo road. Thestudy area is accessible with networkof roads that surrounds it and veryclose to Aarada market.Hydrogeological settingAccording to MacDonald & Davies(2000) who classified the hydrogeologyof Sub-Saharan Africa into fourprovinces, these are: Precambrianbasement rocks, volcanic rocks, unconsolidatedsediments and consolidatedsedimentary rocks (figure 1a). Thesefour provinces are well represented ineNigeria (figure 1b). The study area islocated on the Precambrian basementrocks of Southwestern Nigeria whichcomprise of crystalline and metamorphicrocks over 550 million years old(MacDonald & Davies, 2000).Unweathered basement rock containsnegligible groundwater. However, significantaquifers develop within theweathered overburden and fracturedbedrock (MacDonald & Davies, 2000;Alagbe, 2005). In the soil zone (topsoil) of Precambrian basement, permeabilityis usually high, but groundwaterdoes not exist throughout the year and<strong>RMZ</strong>-M&G 2012, 59
The groundwater potential evaluation at industrial estate Ogbomoso, ...367dries out soon after the rains end. Beneaththe soil zone, the rock is oftenhighly weathered and clay rich, thereforepermeability is low. Towards thebase of the weathered zone, near thefresh rock interface, the proportion ofclay significantly reduces. This horizon,which consists of fractured rock,is often permeable, allowing water tomove freely. Wells or boreholes thatpenetrate this horizon can usually providesufficient water for consumption(MacDonald & Davies).Deeper fractures within the basementrocks are also an important sourceof groundwater, particularly wherethe weathered zone is thin or absent.These deep fractures are tectonicallycontrolled and can sometimes providesupplies of up to 1 l/s or even 5 l/s. Thegroundwater resources within the regolithand deeper fracture zones dependon the thickness of the water-bearingzone and the relative depth of the watertable. The deeper the weathering,the more sustainable the groundwater(MacDonald & Davies, 2000).Geological settingRegionally, the Study area lies withinthe South Western parts of the Basementrocks, which is part of the muchlarger Pan-Africa mobile belt that liesin between the West Africa Craton andCongo Craton, suspected to have beensubjected only to a thermotectonicevent (Alagbe, 2005).In general, the southwestern Nigeriacrystalline Basement (figure 1c) can begrouped into three:• The Migmatite-Gneiss Complex:It compose of Migmatite andgneiss of various composition. Relicsof sedimentary rocks such asquartzitic rocks occurring withinthe group with ages ranging fromPan-Africa (600 million years) toLeonian (Russ, 1957).They havebeen metamorphosed in the middleto upper amphibolite facies(Ajibade et al, 1988).• Metasedimentary and MetavolcanicRocks: (This is also knownas Low grade sediment dominatedschist belt) trending N-S which areconsidered to be Upper Proterozoic(Birimian) in age. The Northwesternbasement has well developedschist belts(Green Schist facies)comprising mainly of phyllite,Schist, quartzitic and banded ironformation(BIF).The rocks are consideredto be Upper Proterozoicthat has been infolded into Migmatite-gneisscomplex (Trusswell &Cope, 1963).• The Pan-African Older GraniteSeries: This intrude both into theMigmatite-gneiss-quartzite complexand the Low grade schist belts.They range widely in age and compositionfrom true granite to grano-<strong>RMZ</strong>-M&G 2012, 59
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444 Lajovic, A.disc brakes, further
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446 Lajovic, A.Slika 2. Izrez iz Si
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448 Lajovic, A.Livne lonce smo na n
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450 Lajovic, A.Ingersol pa je bil z
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452 Lajovic, A.Med delavci, ki so b
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454 Lajovic, A.imel vsak delavec na
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456 Lajovic, A.Slika 5. Izdelki Že
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458 Lajovic, A.pa se ni najbolje iz
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460 Lajovic, A.za delo. Promet na z
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462 Lajovic, A.Sredi osemdesetih le
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464 Lajovic, A.njem delu forme. Na
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466 Lajovic, A.Enourni film je mars
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470 Medved, J., Rosina, A., Vončin
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472 Author’s IndexAuthor`s Index,
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Contents476Phase contrast method fo
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Contents47859/4Calculation of stres
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Instructions to authors481Compositi
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Instructions to authors483NAVODILA
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Instructions to authors485Knjige:Ro
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Template487TEMPLATEThe title of the
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Template491Obstajata dve sprejemlji
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