The Nile countries,Egypt and the Sudan —social and environmental problems of development     

Fouad N. Ibrahim 《GeoJournal》1982,4(1):2-4

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Book reviews     

Helmut Brückner  U. Schweinfurth  K. Müller-Hohenstein  R. Schwäble  Fouad N. Ibrahim  Cesar N. Caviedes 《GeoJournal》1994,33(2-3):326-328

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Coniacian carbonate-conglomerate event on carbonate ramps from the Northern Chotts ranges,South Tunisia: facies geometry and tectono-sedimentary evolution     

Amna Khila  Mohamed Ouaja  Fouad Zargouni 《Arabian Journal of Geosciences》2018,11(3):54

Conglomerate bodies are wide spread in the Lower Coniacian carbonate of the southern of Tunisia. This paper presents an examination of the stratigraphic architecture of these Coniacian conglomerates. It aims to the understanding of the processes leading to their genesis and the relationship and context with the late Cretaceous sedimentation. These conglomerates are related to the incision of Aptian palaeovalleys in a carbonate platform in an extensional setting. The sedimentary analysis and the geometry of these bodies show that the Cretaceous succession in this area are formed by eight facies within four facies associations, representing a series of distinct depositional environments ranging from alluvial plain to the open marine environment. The sedimentary analysis allowed the recognization of elementary sequence which start with the conglomerate bodies corresponding to the incised valley fills.  相似文献   

Polyphasic evolution of the Jeffara basin in southern Tunisia,influence of halokinesis on the passive margin structuration in the Mesozoic and the Cenozoic     

Radhouane Khouni  Mohamed Sabri Arfaoui  Soufiane Dridi  Fouad Zargouni 《Arabian Journal of Geosciences》2018,11(4):68

During the Mesozoic and Cenozoic rifting, the Pelagian Sea recorded the consequences of the African and European plate’s rapprochement. The interpretation of surface and subsurface data that is the 2D seismic reflection and petroleum well data show new ideas on the geodynamic evolution and halokinesis of the Jeffara basin during the Mesozoic and Cenozoic period. Seismic lines interpretations of the subsurface mainly reveal normal syn-sedimentary NW-SE faulting and where the Jeffara fault seems to be the major play. This syn-sedimentary faulting induced horst and graben structures materialized by major sedimentary sequences thicknesses as well as depths variations on the seismic profiles from the Jeffara fault zone overall towards the East of Jeffara basin. After the Hercynian event of the Permian - Carboniferous age, a general extension took place, which gave rise to the Tethyan opening. This extension has favored the individualization of the Jeffara basin in the South East of Tunisia, characterized by a structuring in Horst and Graben with a Permian carbonate subsidence. During the Triassic - Middle Jurassic period, the Jeffara basin is marked by a pronounced subsidence of essentially evaporate sedimentation accompanied by the birth of normal syn-sedimentary NW-SE faults following an NE-SW extension. This subsidence continuing during the Upper Jurassic period, the accentuation of which is towards the NE of the study zone at the Jerba and El Bibane sub-basin with a dominance of bioclastic limestone and dolomites sedimentation in the same extensive NE-SW direction, during this period, the Jeffara basin was characterized by a beginning of salt activity indicated by the appearance of salt nuclei at the base of the preexisting NW-SE normal faults. During the Lower Cretaceous, we are witnessing an individualization of salt complexes in the SE of the study area at Rass Ajil sub-basin, where this reactive diapirism has produced high zones and erosions in the crest above the salt bodies. During the mid Cretaceous period, the Zebbag formation, hatched by the Gattar carbonate bar, recorded a subsidence inversion phenomenon between the three sub-basins Jerba, El Bibane and Rass Ajil sub-basin, and showed the change of movement of the African plate relative to the European plate related to the opening of the North Atlantic and the beginning of the drift towards the North of Africa. This phenomenon is concretized towards the Upper Cretaceous, where we witness a strong subsidence towards the southeastern part of the study area at Rass Ajil sub-basin with sandstone, marl and clay sedimentation under a regional extensive regime and the individualization of high zones at Jerba sub-basin. The salt movements present an active aspect by piercing their cover and inducing rim synclines in the surroundings. The Cenozoic period is characterized by a strong subsidence of sandstone, clays and carbonates along the Jeffara basin, the salt activity shows a passive aspect at the beginning of this period which slows down and eventually stopped at the late Miocene period, thus indicating the probable exhaustion of the source of the salt material.  相似文献   

Grain size characteristics of superficial sediments of the Gulf of Tunis (NE Tunisia)     

Hanen Saïdi  Radhia Souissi  Fouad Zargouni 《Arabian Journal of Geosciences》2014,7(8):3365-3387

This work presents a recent grain size study characterizing superficial sediments of the whole sectors of the Gulf of Tunis which extends from Sidi Ali El Mekki to Sidi Daoued. In this study, a total of 112 samples were collected from different depths following 26 profiles perpendicular to the shore and from rivers. The determination of the proportions of coarse and fine fractions and the interpretation of the grain size results lead to dividing the Gulf of Tunis into two principal coasts: (1) the western coast situated between Sidi Ali El Mekki and Borj Cédria, which is characterized by three sedimentary facies: (a) a sandy facies along the coastline, (b) a mixed facies between Ghar El Melh and Raoued, near the Medjerda River, and between La Goulette and Ezzahra, near the Miliane River, and (c) a muddy facies between Ghar El Melh and Kalâat El Andalous and covered by fine to very fine sands, and (2) the eastern coast, which is characterized by a sandy facies and covered by medium to coarse sands. The dominant N–E and N–W waves generate longshore currents that provide sediment transport following the directions N–S, from Sidi Ali El Mekki to Kalâat El Andalous; SE–NW, from Gammarth to Raoued; NE–SW, from Sidi Bou Saïd to La Goulette and from Sidi Daoued to Bir El Jadi; SE–NW, from Hammam-Plage to Ezzahra; and SW–NE, from Port aux Princes to Rtiba.  相似文献   

Comment on ‘Geodynamic evolution of Jbel Cheid (Northern Tunisian Atlas) from geophysical and geological data’ by R. Benassi (2011)     

Mohamed-Montassar Ben Slama  Mohamed Ghanmi  Mohamed Ben Youssef  Fouad Zargouni 《Arabian Journal of Geosciences》2013,6(9):3595-3600

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Messinian deposits and erosion in northern Tunisia: inferences on Strait of Sicily during the Messinian Salinity Crisis     

Narjess El Euch-El Koundi  Serge Ferry  Jean-Pierre Suc  Georges Clauzon  Mihaela Carmen Melinte-Dobrinescu  Christian Gorini  Anissa Safra  Fouad Zargouni 《地学学报》2009,21(1):41-48

Outcrops, offshore wells, electric logs and seismic profiles from northern Tunisia provide an opportunity to decipher the Messinian Salinity Crisis in the Strait of Sicily. Messinian deposits (including gypsum beds) near the Tellian Range reveal two successive subaerial erosional surfaces overlain by breccias and marine Zanclean clays, respectively. In the Gulf of Tunis, Messinian thick evaporites (mostly halite) are strongly eroded by a fluvial canyon infilled with Zanclean clays. The first erosional phase is referred to the intra-Messinian tectonic phase and is analogous to that found in Sicily. The second phase corresponds to the Messinian Erosional Surface that postdates the marginal evaporites, to which the entire Sicilian evaporitic series must refer. The Western and Eastern Mediterranean basins were separated during deposition of the central evaporites.  相似文献   

Energy and momentum distributions of Kantowski and Sachs space–time     

Ragab M. Gad  A. Fouad 《Astrophysics and Space Science》2007,310(1-2):135-140

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Multi-spacecraft investigation of space turbulence: Lessons from Cluster and input to the Cross-Scale mission     

Fouad Sahraoui  Melvyn L. Goldstein  Alain Roux  Patrick Canu  Nicole Cornilleau-Wehrlin  Thierry Dudok De Wit  Khurom Kiyani 《Planetary and Space Science》2011,59(7):585-591

Investigating space plasma turbulence from single-point measurements is known to be characterized by unavoidable ambiguities in disentangling temporal and spatial variations. Solving this problem has been one of the major goals of the Cluster mission. For that purpose multipoint measurements techniques, such as the k-filtering, have been developed. Such techniques combine several time series recorded simultaneously at different points in space to estimate the corresponding energy density in the wavenumber space. Here we apply the technique to both simulated and Cluster magnetometer data in the solar wind (SW) and investigate the errors and limitations that arise due to the separation of the spacecraft and the quality of the tetrahedral configuration. Specifically, we provide an estimation of the minimum and maximum scales that can be accurately measured given a specific distance between the satellites and show the importance of the geometry of the tetrahedron and the relationship of that geometry to spatial aliasing. We also present recent results on characterizing small scale SW turbulence and provide scientific arguments supporting the need of new magnetometers having better sensitivity than the existing ones. Throughout the paper we emphasize technical challenges and their solutions that can be considered for a better preparation of the Cross-Scale mission.  相似文献   

Characterisation, classification, and evaluation of some groundwater samples in the Mostaganem area of northwestern Algeria   总被引：1，自引：1，他引：0  

Fouad Bahri  Hakim Saibi 《Arabian Journal of Geosciences》2010,3(1):79-89

Mostaganem City, located in the northwestern part of Algeria, has grown and has been urbanized rapidly. The city and surrounding areas depend heavily on groundwater as a resource for drinking water, as well as domestic, industrial, and agricultural uses. Understanding the groundwater chemistry provides insight into the interactions of water with the environment and contributes to better resource management. In total, 12 groundwater samples from wells in Mostaganem City have been analyzed for major physical–chemical elements and metals. The results show that the waters have pH values ranging between 7.1 and 8.1, salinity between 226 and 1,073 mg/L, and nitrate concentrations between 15 and 47.7 mg/L. The high concentration of nitrates is explained by the utilization of chemical fertilizers in agriculture. Almost all samples are of type Na–SO₄ and Na–HCO₃, and the trace metal concentrations are within the admissible standard ranges. We conclude that the groundwater in Mostaganem may safely be used for drinking, domestic, agricultural, and industrial purposes.  相似文献