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GROUND MAGNETIC SURVEY OF PLIOCENCE – PLEISTOCENCE SEDIMENTS IN BAHR AL-NAJAF DEPRESSION, CENTRAL IRAQ

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Abstract

ABSTRACT The present study aims to verify the aeromagnetic shallow source anomaly that appears at Bahr Al-Najaf depression and to determine its source. The studied area is completely covered by Quaternary sediments, which are, almost, composed of sandy sediments. A ground magnetic survey includes 557 magnetic measuring points, distributed mainly on five profiles ranging in their lengths from (0.7 – 16) Km, have been measured in the area. The comparison between aeromagnetic profile and geomagnetic profile has shown a coincidence between them in the regional field. On the other hand, local magnetic anomalies (LMA) have been well recognizable on geomagnetic profiles. The combination of the effect of these LMA seems as similar as that of the aeromagnetic anomaly. Accordingly, the residual aeromagnetic anomaly of Bahr Al-Najaf, which appears related to deep source, can be interpreted as due to accumulations of sediments containing few amounts of magnetic minerals. The source of the LMA has been defined by collecting samples from three separated sites. Results of XRD identifications and heavy minerals laboratory showed the presence of magnetite particles among the sandy sediments.
Thesis
Full-text available
Study area located in southwestern of Iraq at longitude 42o to 44o and latitude 30o to 33o. The potential data derived from Iraqi GEOSURV and from satellite. Using many program in analysis data such as Surfer 14, Encome PA, Oasis Montaj Geosoft and Model Vision. Comparison between gravity and magnetic data that derived from satellite with gravity and aeromagnetic data derived from Iraqi GEOSURV show good matching between them. The satellite data is important in studying the extend of Al-Ma′aniyah depression toward Saudi Arabia. The analysis of potential data is done by converting total magnetic intensity to reduce to pole and separation regional and residual for both gravity and RTP data by two methods that are, polynomial and power spectrum methods. The using THDR, VDR and tilt derivative in distinguish the anomalies in both gravity and magnetic data. Using model vision program in inversion of magnetic and gravity data. The qualitative interpretation of magnetic data shows twenty-five of positive magnetic anomalies and the quantitative interpretation show the depth of magnetic bodies are 7-8 km in northern of study area and 8-9 km in eastern of study area. The quantitative interpretation of gravity data shows the depth of basement rocks 7.5-5km in north of study area and 7.5-10km in south and southeast of study area.
Thesis
Full-text available
Study area located in southwestern of Iraq at longitude 42o to 44o and latitude 30o to 33o. The potential data derived from Iraqi GEOSURV and from satellite. Using many program in analysis data such as Surfer14, Encome PA, Oasis Montaj Geosoft and Model Vision. Comparison between gravity and magnetic data that derived from satellite with gravity and aeromagnetic data derived from Iraqi GEOSURV show good matching between them. The satellite data is important in studying the extend of Al-Ma′aniyah depression toward Saudi Arabia. The analysis of potential data is done by converting total magnetic intensity to reduce to pole and separation regional and residual for both gravity and RTP data by two methods that are, polynomial and power spectrum methods. The using THDR, VDR and tilt derivative in distinguish the anomalies in both gravity and magnetic data. Using model vision program in inversion of magnetic and gravity data. The qualitative interpretation of magnetic data shows twenty-five of positive magnetic anomalies and the quantitative interpretation show the depth of magnetic bodies are 7-8 km in northern of study area and 8-9km in eastern of study area. The quantitative interpretation of gravity data shows the depth of basement rocks 7.5-5km in north of study area and 7.5-10km in south and southeast of study area.
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