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11.
Adel Zein Bishta 《Arabian Journal of Geosciences》2018,11(23):755
Multispectral, multiresolution remotely sensed data were processed to emphasize geological interpretation of Jabal Daf-Wadi Fatima area. The investigated area is situated in the central western part of Saudi Arabia and geologically consists of igneous and metamorphosed rocks overlain by sedimentary sequence belonging to the Arabian-Nubian Shield. Three sets of digital satellite data, Landsat-7 ETM+, ASTER, and SPOT-5, were used in this study. The application of image processing techniques enables to identify and delineate the lithologic units and the structural features of the study area. The results of this study indicate that the confusion matrix of the three maximum likelihood supervised classifications of the three datasets shows that the Landsat ETM+ bands scored the best degree of average and overall accuracy (77 and 78%, respectively). This classification distinguishes most of the rock units for mapping in the investigated area. The supervised classification of ASTER and SPOT bands has lower degrees of accuracy than the classified Landsat data. The supervised classification of SPOT bands has a degree of average and overall accuracy of 66 and 67%, respectively, but it is the best for distinguishing the spectral signatures of the different members of Fatima Formation (lower, middle, and upper members). The statistical analyses of the confusion matrices of classifications and the interpretation of the produced classified thematic maps revealed that the classification accuracy does not necessary depend on the spatial resolution of satellite data. The data of the highest spatial resolution such as SPOT data are also very useful in emphasizing and classifying the rock units of a small outcrop area. The detailed geological map of Jabal Daf-Wadi Fatima area is interpreted in this work from supervised classified images of different resolutions as well as the structure map of this area. This study shows that it is preferable to use the supervised classifications of multiresolution data for rock unit discrimination in detailed field mapping. 相似文献
12.
Samir M. Zaid Oussama A. EL-Badry Adel M. Akarish Mahmoud A. Mohamed 《Arabian Journal of Geosciences》2018,11(7):147
The mineralogy and geochemistry of the Upper Cretaceous Duwi black shales of Nile Valley district, Aswan Governorate, Egypt, have been investigated to identify the source rock characteristics, paleoweathering, and paleoenvironment of the source area. The Duwi Formation consists mainly of phosphorite and black shales and is subdivided into three members. The lower and upper members composed mainly of phosphorite beds intercalated with thin lenses of gray shales, while the middle member is mainly composed of gray shale, cracked, and filled with gypsum. Mineralogically, the Duwi black shales consist mainly of smectite and kaolinite. The non-clay minerals are dominated by quartz, calcite, phosphate, dolomite, feldspar, with little gypsum, anhydrite, iron oxides, and pyrite. Based on the CIA, PIA, and CIW values (average?=?84, 94, 95, respectively), it can be concluded that the litho-components of the studied shales were subjected to intense chemical weathering and reflect warm/humid climatic conditions in the depositional basin. The provenance discrimination diagram indicates that the nature of the source rocks probably was mainly intermediate and mafic igneous sources with subordinate recycled sedimentary rocks (Nubia Formation). Geochemical characteristics indicate that the Duwi black shales in Nile Valley district were deposited under anoxic reducing marine environments. 相似文献
13.
Attia Michael Abdel Razek Mohamed Salam Adel Abdel 《Geotechnical and Geological Engineering》2021,39(8):5767-5774
Geotechnical and Geological Engineering - Failure in earth dams mainly occurs due to seepage to the unprotected downstream face of the dam. Therefore, many precautions are taken into consideration... 相似文献
14.
Acta Geochimica - Mineralogical and geochemical characteristics of stream sediments collected from 30 stations in the Dahab-Wadi Kid area (southeastern Sinai, Egypt) are presented. The studied... 相似文献
15.
Osama M. KASSEM Yousef A. ALAMRI Faisal K. ZAIDI Abdel Aziz M. AL BASSAM Mansour H. AL-HASHIM 《《地质学报》英文版》2021,95(3):750-760
The vorticity analysis technique was applied to measure the different lithological units,such as schist,metagranite and metavolcano-sedimentary rocks,which are present in the Halaban region.This work aims to interpret the relationship between the different lithologies and the tectonic setting,in order to elucidate the nature of kinematic analysis in the Halaban region.The kinematic analyses were applied to feldspar porphyroclasts,quartz and hornblende for twentysix samples.The kinematic vorticity number (W_m) for deformed rocks in the study area ranged from~0.6 to 0.9.The direction of the long axes for finite strain data (X axes) revealed a WNW trend with shallow dipping.The direction of the short axes for finite strain data (Z axes) were represented by vertical with associated horizontal foliation.The results of the kinematic vorticity and strain analyses are characterized by simple shear with different degrees of deformation in the Halaban region.Furthermore,our finite strain data shows no significant volume change during deformation.The subhorizontal foliation was synchronized with thrusting and deformation.Furthermore,throughout the overlying nappes,the same attitudes of tectonic contacts are observable,the nappes in the orogens being formed from simple shear deformation. 相似文献
16.
A. G. Taher S. Abdel Wahab G. Philip W. E. Krumbein A. M. Wali 《International Journal of Salt Lake Research》1995,4(2):95-116
A salina system along the Mediterranean coast of Egypt was investigated. Five sedimentary facies are described. For each facies, the evaporitic sedimentation and the biological conditions are considered. Comparisons of evaporite precipitates in the salina with ancient deposits are made. 相似文献
17.
M. Abdel Wahab 《Theoretical and Applied Climatology》1991,44(3-4):201-207
Summary A detailed study of widespread thunderstorm activity occurring in winter over the central and coastal parts of Egypt (Cairo 30° N, Marsa Matruh 31° N) is presented. The storm activity is associated with strong positive vorticity in the 300/200 mb layer. The maximum kinetic energy was located at the storm centre. The divergent wind component was found to be very important in energy transformation and a major cause of energy generation by cross contour flow.With 3 Figures 相似文献
18.
A highly jointed, highly fossiliferous, vuggy and sandy dolomitic limestone, the Ain Musa Bed, is the foundation bed rock of Mokattam city. The slopes southwestern sides of the Upper Plateau of Gebel Mokattam, where the city was built, have been affected by slope failure and retreat of the edge of the and a road have been damaged. A 55 m slope retreat took place between 1956 and 1989. A field model is proposed for the slope failure in this area where foundation bed rock are removed by erosion after swelling and flowing, which is due to saturation by leaking fresh and sewage water. The resulting unde bed rock leads to slope failure of large blocks where vertical joints act as potential failure surfaces. Several recommendations are proposed to decrea failure in the city.
The Upper Plateau of Gebel Mokattam is underlain by limestones of the Middle Plateau where a new suburb is being built. A comparison between the geolog properties of the foundation bed rocks of the Upper and Middle Plateaux indicates that the limestones of the latter are more suitable foundation bed ro with expansive clays and are composed of hard, micritic limestones with a few megafossils and no cavities. Rock mass properties are also different and are stable. 相似文献
19.
Abdel Hamid Bakhit 《GeoJournal》1994,34(3):253-255
The failure of some individuals and groups to command adequate food can be accounted for through the analysis of the interplay of three mechanisms, namely food availability, food affordability and food accessibility. In Khartoum, as the case is in many other state-capitals, availability of food is not a major constraint in the dynamics of the food system. Of more significance for the configuration of the space of vulnerability are the processes related to affordability and accessibility, which combine to configurate the space of vulnerability. Occupation, place of residence, ethnic belonging and, of late, political allegiance define to a large extent the location of people in this space. 相似文献
20.
A Hydrologic Budget Analysis for the Nile Valley in Egypt 总被引:3,自引:0,他引:3