Magnetic and Geoelectric characteristics of East Rosetta sand placer deposits, Egypt (original) (raw)
Related papers
International Journal of Geophysics, 2012
The present study deals with the analysis and interpretation of the results of field geophysical survey and laboratory geophysical measurements. The study of the magnetic and electrical methods was selected because the beach sands contain many minerals that have magnetic and electric properties. Analysis and interpretation of the field and laboratory magnetic and geoelectric maps demonstrated that the investigated beach-alluvial deposits can be subdivided according to their magnetic and geoelectric properties into three main zones striking nearly parallel to the shoreline of the Mediterranean Sea at the study area. The northern zone is more enriched in black sands than the central or southern zones. Field and laboratory magnetic susceptibility measurements provided very useful maps for the concentration of heavy minerals. The deep-seated magnetic response was calculated at an average depth of 239.6 m, while the near-surface magnetic responses were computed at average depths of 9.1, ...
Geoelectric study to detect the fresh zones, Fuka area, Northwestern Coast of Egypt
Ras El Hekma area represents one of the main headlands along the southern Mediterranean coast, this study is focused on Fuka Area on the Northwestern coast of Egypt. The purpose of this study is the determination of the subsurface layer’s distribution, exploration of water-bearing layers and determination of their thickness and depth, as well as delineation of saltwater intrusion in Fuka coastal aquifer, which represents the main environmental problem in the coastal areas. The study area has three aquifers: Holocene, Pleistocene, and Middle Miocene aquifers. The present study clarifies the depth to fresh water which is recommended to be drilled and also reveals the saline water depth to be avoided. This delineation was by using Geoelectric method to make true resistivity, true depth and true thickness maps and interpret them with considerations of the Hydrogeology and Geology of the area that was previously studied.
Earth, Planets and Space, 2013
The present study deals with the analysis of data from a ground magnetic survey that was conducted in the Abu-Rodaym area of the Southwestern Sinai Peninsula, Egypt. This survey was carried out to delineate the subsurface structural framework, and to identify the thickness of the sedimentary basin of the study area. Locating these structures, and determining the localities of maximum sedimentary thicknesses that consist mainly of sandstone, serves as a preliminary process in exploring the confined aquifer beneath the surface of the Abu-Rodaym area. This will greatly benefit Bedouins who suffer greatly from a lack of water in the driest region in the country. The processing, analysis, and interpretation, of the total intensity magnetic data shows that there are three sets of faults striking mainly in the N-S, NW-SE, and NE-SW, directions. The depth to the basement surface was found to fluctuate from about 45 m, to more than 100 m, beneath the ground surface. It was also found that the variations in magnetic observations were produced by the striking structures that are mainly responsible for the variations in thicknesses of the sedimentary rocks in the area.
International Journal of Applied Earth Observation and Geoinformation, 2008
2D dipole-dipole resistivity data and ground magnetic survey are used in combination with available data from boreholes and surface geology to detect subsurface structures and stratigraphic units and to study the ability of the site area (located at north Grater Cairo) for a building construction. Five 1-km length dipole-dipole profiles were measured using electrode spacing of 5 m. The data from these profiles, which were carried out parallel (125 m apart) and in E-W direction, have been inverted using a 2D regularization algorithm. The geoelectrical models obtained from inversion of the field data allowed the characterization of different geological units such as mud, alluvium, sandy clay and sand and sandstone deposits. Two hundred and twenty seven stations of ground magnetic data have been measured in a grid of 50 m  50 m using two automatic proton precession magnetometers with an accuracy of 1 nT. The results showed that the depth of the basaltic basement varies between 24 and 122 m and it is affected by several fault elements trending NW-SE and crossing the southwestern part of the study area. These faults seem to control the distribution of the sedimentary cover. Fifteen boreholes drilled in the area with depths ranging from 50 to 202 m have been used to define the thickness of the different lithological units and the depth of the top of the basaltic sheet. The results of the boreholes logging indicate that the depth of basaltic sheet ranges from 23.7 m, in the western part of the study area, to 122 m in the central part.
MAGNETIC ACQUISION AND INTERPRETATION FOR THE AREA OF RAS GARIB, EGYPT
Bull of Ain Shams University, 1997
A new detailed geomagnetic survey for the area of Ras Garib for the total geomagnetic field were performed using two Proton magnetometers, one of them as a local reading inserted in the area, while the second was used for measuring the total intensity in which like configuration every about 250 meters. The area selected for the present study lies in between latitudes 28* 18* & 28* 28* N and Longitudes 32* 51* & 33 01* E. The study of the structural features indicates that there are four predominant sets of faults. These sets are trending N 35* E, N 45* W, N 75* E and N 75* W. Quantitative analysis on the major anomaly occupying the area revealed that the average depth to the top of the basement complex about 2.3 Km's. We conclude that the subsurface geologyic conditions are generally connected with these anomalies and show good accardanc.
Contributions to Geophysics and Geodesy, 2011
In the present work, we present a reconnaissance study to elucidate and delin-eate the subsurface structures and tectonics of the area between Dahshour and El Fayoum province using available magnetic data; including land magnetic survey and aeromagnetic data. The study area has been selected due to its active tectonic situation. The magnetic data have been analyzed to provide new information about the tectonic setting and sub-surface structures of the study area. A detailed land magnetic survey has been carried out for the total component of geomagnetic field using two Proton magnetometers, one of them as a local reading base station placed in the middle part of the area, while the second was used for measuring the total intensity of the different points in a mesh-like configuration. The necessary corrections for the measured magnetic data have been car-ried out. The total land intensity and aeromagnetic maps have been reduced to the north magnetic pole. Moreover, wave number filter...
In the present work, we present a reconnaissance study to elucidate and delineate the subsurface structures and tectonics of the area between Dahshour and El Fayoum province using available magnetic data; including land magnetic survey and aeromagnetic data. The study area has been selected due to its active tectonic situation. The magnetic data have been analyzed to provide new information about the tectonic setting and subsurface structures of the study area. A detailed land magnetic survey has been carried out for the total component of geomagnetic field using two Proton magnetometers, one of them as a local reading base station placed in the middle part of the area, while the second was used for measuring the total intensity of the different points in a mesh-like configuration. The necessary corrections for the measured magnetic data have been carried out. The total land intensity and aeromagnetic maps have been reduced to the north magnetic pole. Moreover, wave number filtering technique has been carried out on the magnetic data utilizing three types of filters with varying wavelengths. The application of these tools on magnetic data discriminated the variable sources of specific depth ranges for the residual and regional anomalies, as well as those limited to a certain depth interval. It was found that the main tectonic trends taken the directions NE-SW, NW-SE and E-W. Three basement cross-sections have been generated using the 2-D modeling to support the interpreted structures and give idea about the configuration of subsurface basement shape. Depth estimations have been conducted by application of the Power spectrum, analytical signal and 2-D modeling techniques. The results indicate that the average calculated depth ranges between 1.8 km to 3.5 km, while the depth to volcanic intrusions ranges between 0.20 km and 0.30 km.
Geoelectrical Survey For Engineering Uses, Madinaty City, Egypt
2017
Near Surface Geophysical Techniques such as electrical resistivity tomography (ERT) is useful technique for delineating subsurface configurations such as stratigraphy, structural elements. The ERT technique is used to delineate the contamination, and buried objects, as well as to quantify some aquifer properties. Twenty -four 2-D electrical resistivity sections were measured using Wenner configurations. The spread length is about 100 m and the electrodes spacing are 1m, respectively, to reach about 30 m. The results indicate that, the subsurface section is divided into main three geo-electrical units, the first geoelectrical is highly weathered (loose sediments composed of sand and gravels)., which exhibits low resistivity values ranging from 280 to 550 ohm m. The second geoelectrical unit is corresponding to loose sand with small rounded flint pebbles and fossil woo of moderate resistivity values from 500 to 1100 ohm m. The third geoelectrical unit, which is the lower bed, exhibits...
Contributions to Geophysics and Geodesy
In the present work, we present a reconnaissance study to elucidate and delineate the subsurface structures and tectonics of the area between Dahshour and El Fayoum province using available magnetic data; including land magnetic survey and aeromagnetic data. The study area has been selected due to its active tectonic situation. The magnetic data have been analyzed to provide new information about the tectonic setting and subsurface structures of the study area. A detailed land magnetic survey has been carried out for the total component of geomagnetic field using two Proton magnetometers, one of them as a local reading base station placed in the middle part of the area, while the second was used for measuring the total intensity of the different points in a mesh-like configuration. The necessary corrections for the measured magnetic data have been carried out. The total land intensity and aeromagnetic maps have been reduced to the north magnetic pole. Moreover, wave number filtering technique has been carried out on the magnetic data utilizing three types of filters with varying wavelengths. The application of these tools on magnetic data discriminated the variable sources of specific depth ranges for the residual and regional anomalies, as well as those limited to a certain depth interval. It was found that the main tectonic trends taken the directions NE-SW, NW-SE and E-W. Three basement cross-sections have been generated using the 2-D modeling to support the interpreted structures and give idea about the configuration of subsurface basement shape. Depth estimations have been conducted by application of the Power spectrum, analytical signal and 2-D modeling techniques. The results indicate that the average calculated depth ranges between 1.8 km to 3.5 km, while the depth to volcanic intrusions ranges between 0.20 km and 0.30 km.