The Kwahu-Bombouaka Group of the Voltaian Basin, which defines the northern fringe of the basin, constitutes a significant part of the North East Region of Ghana. Most of the inhabitants in the region depend on groundwater for domestic and irrigation purposes. Therefore, a geochemical characterization and assessment of groundwater quality in the area was carried out using hydrochemical, GIS-based ordinary

The seismicity rate variations prior to the 1993 and 1995 Gulf of Aqaba mainshocks have been investigated using statistical analysis, focusing on the precursory phenomena of the seismic activity progression. A statistical estimation of the seismic quiescence was applied to detect a significant reduction in the rate of seismic activity, using the normal standard deviate Z-test. The catalogue data both

The reliable source parameters, the current deformation associated to the earthquakes and the current deformation in relationship with dynamic change of Victoria plate rotation are generally poorly understood owing to the lack of the proper techniques used in the Circum-Tanzania Craton. Therefore, the reliable estimated source parameters and the detail interpretation are very crucial. Here, moment

The irregular echinoid Pygurus meslei Gauthier, 1896 is briefly described from the top part of the Antalo Limestone Formation exposed at Mugher (Blue Nile Basin, Ethiopia). The age of the urchin is constrained by calcareous nannofossils as Upper Tithonian. This is not only the first record of Pygurus meslei Gauthier, 1896 from Ethiopia but also the youngest, worldwide. Very briefly, the African records

The Oran region (Western Tell Atlas) was hit by two earthquakes on January 9th, 2008 (Mw = 4.7) and on June 6th, 2008 (Mw = 5.4). The two events were recorded by the national accelerographs network maintained by National Center of Applied Research in Earthquakes Engineering (CGS, Algiers). This work aims to characterize these two earthquakes in order to contribute to understand the seismotectonic context

The interaction of marly soils and buildings in the town of N'Gaous has led to the appearance of deformations and disturbances that have affected many constructions due to the swelling of the underlying soil. In addition, when these soils are used as construction material, embankments, they are extremely problematic. In this article, three sets of samples, from three different locations, were sampled

Structural study of in the Sangmelima granite-greenstone terrains (SGB) provide a new overview of the evolution of the Ntem Complex (South Cameroon), the northwestern part of the Congo Craton. The regional deformation is marked by a strong steep dips foliation and steeply plunging mineral-stretching. D1-related structures are folding and shearing by a D2 deformation that is synchronous with extraction

Cenomanian – Turonian (CT) Afowo shales selected from offshore X, and coastline Orimedu-1 and Ise-2 exploratory wells in the Dahomey Basin, southwestern Nigeria, were analyzed for foraminifera, major oxide and trace elements to evaluate their provenance and paleoenvironments. The hydrocarbon rich calcareous CT shale is about 100m thick in the coastline area and 300m thick in offshore area with abundant

Sixty-five genera and 115 species of dinoflagellate cysts were discovered in the samples from the depth of 600–2652 m in the Facai-1 Well in the Tenere Graben of Niger, Africa. The low diversity and abundance in each single sample make it difficult to divide the dinoflagellate cyst assemblage into biozones. The dinoflagellate cyst assemblage is indicative of a Late Cretaceous age as and suggests an

In the context of a high-resolution stratigraphic perspective, facies analysis is carried out to interpret the paleoenvironments that prevailed during the Cenomanian–Turonian sedimentation in the Eastern Desert of Egypt. Particular emphasis is placed on the possible reasons for observed changes in the facies distribution. The facies associations indicate that the mixed carbonate and siliciclastic successions

Surface and subsurface data are used to illustrate the halokinetic style, structural evolution and kinematics of the Lansarine–Baouala salt structure in the Alpine domain of Tunisia. It corresponds to a salt structure showing a large salt canopy overhanging buried diapir. The salt structure is located along the main fault systems, inherited from the southern Tethyan passive margin periods. The Northern

The Benue Trough is a contiguous intracontinental basin that formed part of the mega west and central African rift system (WCARS). The Cretaceous sedimentary succession preserved up to 6 km thick. The Aptian-Albian Bima Sandstone non-conformably overlies the Precambrian basement rock and the sandstone is the oldest Cretaceous succession in the Upper Benue Trough. This paper aimed at understanding its

Sedimentation of dams and soil erosion remain a worldwide issue, this is especially true in countries characterized by great environmental diversity where their assessment remains a serious difficult issue. Morocco ranks among countries with the greatest achievements in the dams field in Africa, characterized by a great climate, vegetation cover and morphological diversity. The objective of this study

Statistical analyses are performed on the geomorphological characteristics of Makkah Al-Mukaramah basins. The purpose of these analyses is to study the variability of the geomorphological characteristics (13 parameters) and their effects on the variability of the hydrological and kinematic response (6 variables). Different probability density functions (PDF) of the prevailing morphometric variables

The littoral zone of the Safi coastline is characterised by different geomorphological forms of coastal cliffs cutting into alternating layers of clay and limestone outcrops. The cliffs undergo a wide range of erosional processes with landslides as the most significant mode of recession. A classification of these landslides was made using the typology of the mechanisms, materials and the state of activity

The aim of this study is to provide a Moho geometry model for northern Algeria where the few studies that have been carried out concern only restricted areas. The method we used is based on the 3D inversion of the Bouguer anomaly data computed by the Bureau Gravimétrique International (BGI) from satellite data. The proposed Moho depths are roughly comparable to those obtained by previous studies conducted

Two-dimensional (2D) electrical resistivity tomography (ERT) surveying systems typically use standard protocols that assume straight survey lines and collinear electrodes. However, due to the presence of infrastructures and other surface constraints, it is not always possible to conduct 2D ERT surveys along straight lines. When survey lines are angled, the apparent resistivity data are affected for

In the Siguiri volcano-sedimentary basin located in north-eastern Guinea, and particularly in the Alahina District, the lithological column consists of schistose argilitic to feldspathic sandstone rocks with micashists, limestone, and traversed by pyroclastites, monzogranites and Paleoproterozoic granodiorites of an age between 2040 and 2250 Ma. These formations are surrounded in places by Neoproterozoic

A new method to detect paleolakes via their gravity signal is presented (here with implications for geoscience and archaeology). The gravity aspects or descriptors (gravity anomalies/disturbances, second radial derivatives, strike angles and virtual deformations) were applied. They were computed from the gravity field model EIGEN 6C4 (European Improved Gravity model of the Earth by New techniques)

Fifty-three bivalve species from the Cenomanian-Turonian strata in the Southern Galala Plateau (Eastern Desert, Egypt) were used to identify major factors controlling their regional and global distribution. Non–metric multidimensional scaling (NMDS) indicated that rock type is a major factor controlling the bivalve distribution, while other biotic parameters such as life habit and mobility level have

The Tuareg shield in North-West Africa is composed of an assembly of Neoproterozoic continental and oceanic terranes, as well as Archean and Paleoproterozoic terranes separated by major continental shear zones. In the Silet terrane, the igneous suite of Silet-Taourirts is composed of post-collisional ring-complexes of ferroan alkaline and alkali-calcic granites. Six ring-complexes have been dated using

The expansion in human activities, the absence of running water in South Sinai province in northeastern Egypt and the high cost of seawater desalination render groundwater the essential source for potable water in this arid region. This contribution represents the integration of geophysical and hydrochemical investigations to delineate groundwater distribution and evaluate the water quality of the

We used 2D and 3D electrical resistivity imaging (ERI) data inversion to locate and characterize the coal seams in Mmamabula Coalfield. The 2D ERI data inversion usually assumes that subsurface geological units (e.g. coal seams) are infinitely continuous in the direction perpendicular to the profiles. However, this assumption might be violated due to the heterogeneous nature of fluvial/deltaic environments

Large-scale coal mining is being carried out in Tete province, Mozambique. This area is also being planned to become a large coal fired power production hub serving electricity to neighboring countries in southern Africa. Thus, huge amounts of coal will be burned, resulting in the generation of a large quantity of coal ash. High concentrations of hazardous elements are often released from coal and

Typically pressure gradients and density-neutron crossover are used to differentiate between reservoir water, oil and gas. This study investigates fluid type in the Badri Field, Sidri sandstone reservoir of four offshore wells, A, B, C and D. These wells lack pressure or well test data and density-neutron fluid interpretation remain equivocal. In addition, these wells have not been tested before. Hence

During most of the Holocene, the Faiyum Depression in Middle Egypt was connected to the Nile River and contained an extensive freshwater lake. Geochemical analysis of a lacustrine sediment core (Qaru-9) from the depression provides evidence of changes in Nile sediment discharge related to changes in Ethiopian African Monsoon (EAM) precipitation, and allows us to reconstruct changes in Nile River runoff

Two lithofacies and fluid discriminating seismic attributes are integrated using Artificial Intelligence (AI) via Unsupervised Artificial Neural Network (UANN) to characterize the architecture of deep water turbidite channels and submarine fan lobes across a hydrocarbon bearing reservoir within the Frem Field deep-water Niger Delta. A data-based approach including reservoir identification, environment

Two exposed sections of the Lower/Upper Maastrichtian to Danian at northern and northeastern Farafra Oasis, Western Desert (Egypt) namely, the Farafra–Ain Dalla road and the Ain Maqfi sections have been analyzed for their planktonic and benthonic foraminifera to constrain the biostratigraphy and infer the paleoenvironmental conditions. Lithostratigraphically, the successions of the present study are

During the evolution of sedimentary basins, clay minerals may record changes in their mineralogy, chemistry, and texture as a response to diagenesis, fluid flows, and tectonic activities. Therefore, studying clay minerals in sedimentary rocks provides important information that may assist to decipher the basin history. The focus of the present study is the Teloua Sandstone Formation (Fm) which belongs

The Eastern Anatolian region provides a good example for collision–related volcanic activity. This activity started during the Middle Miocene and continued through the Pliocene and Quaternary. The new K − Ar ages reveal that the post–collisional Pliocene Timar basalts located in the East Anatolian Accretionary Complex (EAAC) erupted between 4.72 (Zanclean) and 3.29–2.93 Ma (Piacenzian). The Pliocene

The Bakoudou gold deposit, southern Gabon, is hosted in the Archean basement granitoids of the Chaillu Massif. These granitoids of the Bakoudou deposit are subdivided into two main groups: TTGs and porphyritic biotite granites. The TTGs show geochemical characteristics similar to those of other TTGs worldwide, such as high Al2O3 (13.49–18.93 wt%) and Na2O (3.27–4.66 wt%) and low K2O (1.01–1.98 wt%)

The El-Dabbah Group of the Nubian Shield, Central Eastern Desert, Egypt, contains a Neoproterozoic banded iron sequence within volcaniclastic rocks deposited in an island arc setting. The group contains a volcaniclastic sequence of relatively undeformed lower-greenschist-facies rocks that are unconformably overlain by terrestrial sedimentary strata of the Hamamat Group. The group is > 7000 m thick

In this contribution, high resolution multibeam swath bathymetry and PARASOUND sediment echosounder data are used to describe a region within the distal part of the central Mozambique Channel. The study area marks a transition from abyssal plain to abyssal hill type morphology within the sediment-rich Mozambique Fan and associated with a zone of extension in response to East African Rift System kinematics

The stratigraphy and paleoenvironment of the Lower-Middle Eocene Apollonia Formation exposed at the northeastern and southern parts of Darnah city, northeast Libya, was studied in detail by means of foraminifera, where rich benthic and planktonic foraminiferal assemblages were recorded. Fifty-seven planktonic foraminiferal species and subspecies belonging to nineteen genera and seven families were

More than 50 years of space and planetary exploration and concomitant studies of terrestrial impact structures have demonstrated that impact cratering has been a fundamental process - an essential part of planetary evolution - ever since the beginning of accretion and has played a major role in planetary evolution throughout the solar system and beyond. This not only pertains to the development of

The East African Orogen, extending from southern Israel, Sinai and Jordan in the north to Mozambique and Madagascar in the south, is the world́s largest Neoproterozoic to Cambrian orogenic complex. It comprises a collage of individual oceanic domains and continental fragments between the Archean Sahara-Congo-Kalahari Cratons in the west and Neoproterozoic India in the east. Orogen consolidation was

The publication entitled Influence of structures on drainage patterns in the Tushka region, SW Egypt, Journal of African Earth Sciences 136 (2017) 262–271, introduced a preliminary geophysical study to delineate the hydrogeological potential of Tushka basin in south Egypt (Robinson et al., 2017). However, that study omitted some important topics that can greatly affect its final achievements in Tushka

In wake of the lakes Monoun and Nyos disasters, the aim of the Nyos Organ Pipes Program was clearly to mitigate the hazard of a limnic eruption at both lakes in the coming decades. Due to the carbon dioxide natural recharge of the Nyos lake water, the self-siphon degassing pipes had been progressively scaled up since 1992 in order to liberate most of the CO2 content of the lake in a reasonable time

A high-resolution sequence-stratigraphic framework is proposed for the Marrat Formation (Early to Middle Toarcian of Saudi Arabia) by presenting new outcrop and shallow core sedimentological data located along a 280 km long N-S transect south of Riyadh and westward subsurface correlations based on gamma-ray wireline logs (200 km Ar Riyadh to Khurais Field). This extended spatial cover allows the identification

The Palaeoproterozoic Bled M’Dena ring complex (BRC) dated at 2.01 Ga (Rb–Sr isochron) situated in the eastern part of the Yetti–Eglab junction-zone, belongs to the Aftout orogenic province, intruding the Aftout granite (2.07 Ga). It exhibits a centripetal evolution from gabbro to granodiorite. The western part of the Bled M’Dena ring complex is dominated by volcanic rocks varying in composition from