Abstract This study highlights the distribution of hydraulic conductivity (K) in the regional aquiferous Ajali Formation of SE-Nigeria on one hand and assesses the possible influences of textural and geochemical characteristics on the hydraulic conductivity on the other hand. The investigation approach involved field sampling and collection of 12 sandstone samples from different outcrop locations, followed by laboratory studies such as grain-size analysis (GSA), constant head permeameter test...
Abstract Subsurface samples from the Akinside 1582 well, located within the eastern Dahomey Basin were evaluated to determine the lithofacies, depositional environment, and hydrocarbon potential of the basin. The sediments within the interval 138-197m consist of limestones, shales, mudstone and glauconite; thus representing sediments belonging to the Ewekoro and Akinbo Formations. The limestones are greyish, highly indurated, partly recrystallised and reveal six microfacies notably biosparite...
ABSTRACT A sequence of conglomerates, sandstones, slltstones, claystones carbonaceous shales and mudstones which rims the Oban Massif in the Calabar Flank, constitutes the Early Cretaceous (probably Aptian) Awi Formation In the southeastern Nigeria. Field studies and laboratory analyses were conducted on these sediments to determine their provenance and depositlonal environment. Field observations show that the sediments are grently dipping (.< 16°) in a southwesterly direction. They vary in...
ABSTRACT Most studies on groundwater in Nigeria have always been limited to either their occurrence or chemistry, with insufficient attention on potential, chemical character and evolution. This study therefore was designed to evaluate groundwater in Abeokuta (Basement Complex) and Ikorodu (Sedimentary) areas with the aim of highlighting groundwater potential, chemical characteristics and provenance in the two geologically contrasting terrains. A total of 125 Vertical Electrical Soundings (VE...
Abstract The Ohangwena Multi-Layered Aquifer (KOH) is one of the six Aquifer Systems found in the Cuvelai-Etosha Basin, Namibia. The aquifer system is multi layered, consisting of a shallow perched Ohangwena 0 aquifer (KOH-0), semi-confined Ohangwena I aquifer (KOH-1), and confined Ohangwena II aquifer (KOH-2). Currently, a large portion of the population in the study area rely on water from KOH-0 by means of hand-dug wells. The occurrence and potential of this perched aquifer is not fully u...
Abstract An understanding of the water used by vegetation in water limited environment is critical to fully understand water relations of natural areas with vegetation. Such information can be integrated in water management plans to estimate the influence of groundwater abstraction on the vegetation. Trees and shrubs are able to access water from: the upper unsaturated soil profile, the capillary zone of a groundwater store, from nearby streams and rivers. Previous studies have proven that u...
Abstract The Langer Heinrich and Klein Trekkopje U deposits are located within the Namib Desert in Central Namibia. Both deposits are hosted by calcretes developed within palaeo-channel systems of Tertiary age. The sources of both U and V in the two deposits and the reasons why the two deposits differ in terms grade and tonnage have remained unclear to many researchers. The study aimed to resolve these uncertainties. During the study, the geology of the area was reviewed and a number of rese...
ABSTRACT A number of environmental studies previously conducted in the Tsumeb Mining district analysed total metal concentrations in soils and vegetation; with results showing high concentrations of heavy metals such as arsenic, cadmium, copper, lead and zinc which exceed international guidelines for different land uses. However, the actual concentrations of only potentially harmful species for each element were not ascertained. This study aimed at determining the concentrations of potential...
Grateloupia filicina is a carrageenophytic red alga which is in demand as a carrageenan raw material and for use in food. There is therefore interest in developing a technique for mariculturing this species. Since vegetative propagation from thallus fragments has not been successful, the present study was initiated to determine suitable conditions for spore liberation and growth of G. filicina from spores. It was also attempted to propagate G. filicina sporelings from crust and thallus fragme...
Natural regeneration of the Mexican weeping pine Pinus patula on Mt. Mulanje was investigated and found to represent a serious threat to the natural vegetation, with the invasion already advanced on the north eastern plateaux. Various aspects of the biology of the pine are related to its success as an exotic invader on the mountain. Perhaps most important is the ability of the species to cope with fire, and the role of regular fires in enhancing the invasion. Urgent action is needed ...
The Etendeka Formation volcanics of north-western Namibia form part of the Karoo Igneous Province of southern Africa and consist of a series of basalts interbedded with quartz latites and minor volumes of latite. This thesis examines various aspects of the geology and geochemistry of the quartz latites, in particular the volcanological and petrogenetic origin of these rocks . This study has involved the geological mapping of ca. 5000 km2 of the southern Etendeka region and the documentation o...
ABSTRACT The Natal Valley is a sediment-filled marine basin situated between the east coast of southern Africa (Natal) and the Mozambique Ridge. Geophysical and sedimentological t~chniques are used in a broad geological study of the mid Natal Valley. Major emphasis is directed to: (a) basin history and tectonic evolution; (b) seismic stratigraphy of the basin fill; (c) recent sedimentary processes and responses. General basin morphology is defined by five major physiographic provinces: contin...
ABSTRACT One of the most spectacular changes in Ghana since the 1980‘s after World Bank and International Monetary Fund programmmes (ERP and SAP) has been the dramatic demographic shift skewed in favour of cities. With fewer than 49 percent of its people being rural, the 2010 population census indicated that the country is currently 50.9 percent urbanized. Accompanying such demographic explosion is the challenge of developing the needed infrastructural resources to deal with urban growth an...
ABSTRACT The hydrogeological conditions of University of Ghana, Legon Campus was assessed using geophysical and numerical techniques. Data from borehole lithological logs and electrical resistivity survey was used to conceptualize the hydrogeological system of the terrain whiles using MODFLOW to generate groundwater flow simulation models under steady state conditions. The objective of the study was to conceptualize the hydrostratigraphy through geophysical techniques, develop a groundwater f...
ABSTRACT Mafi-Tsawla and surroundings geologically belongs to the internal zone of the Pan-African Dahomeyide orogenic belt, in southeastern Ghana. The geology of these internal units requires a total understanding of the structures and lithological types and their sequences. However, the structural and petrologic evolution of these internal units is unresolved, and this results in limited understanding of the geology of the terrain. The objectives of this study are to conduct a systematic fi...