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Title: دراسة خام الحديد الرسوبي وودائع خام المنجنيز المرتبطة به في منطقة وادي حلفا – الولاية الشمالية –السودان = Study of Sedimentary Iron Ore and Associated Manganese in Wadi Halfa area – Northern Sudan
Authors: محمد منصور أمين فضيل
Keywords: Regional geology
Paleo geography
Issue Date: 2021
Publisher: جامعة إفريقيا العالمية
Citation: جامعة إفريقيا العالمية - كلية الدراسات العليا – كلية المعادن والنفط - قسم الجيولوجيا الإقتصادية
Abstract: The study area is located in the Northern part of the Sudanese Egyptian boundaryin wadi halfa between Latitudes 21.971944 and 21.754444N and longitudes 31.268888 and 31558333E. The main geological units in the study area are composed of Basement Complex (Pre-Cambrian), Nubian sandstone formation (upper Cretaceous) and Quaternary superficial deposit in ascending chronological order. The aim of this study is to investigate the geological and geochemical behavior and geochemical conditions affecting precipitation of sedimentary Iron ore and associated Manganese. The methodologies have been used to realize the objectives of this study included; fieldwork, office mapping, remote sensing, and as well as the Geographic Information System (GIS), geochemical data analyses, thin sections, polished sections. The main findings are summarized below: according to field observation Sedimentary Iron and Manganese ores can broadly be considered as occurring in three major classes: Bog iron ores, Ironstones, and Banded Iron formations. Vertical sedimentary profiles revealed that the Iron and Manganese ores occurred in study area at different types in stratigraphic sequence such as cap, beded and interbeded. Petrographic study of Iron and Manganese ores in collected samples includes study of the textures and structures of ores to obtain ore history. The main types of textures and structures in studied samples are oolitic, granuler, lamellar and bands. According to above results the origin of iron ore and associated manganese it's forming by chemical precipitation during chemical weathering of surrounding areas that means its marine environment. Geochemical investigation of studied samples includes chemical analysis, trace element analysis and major oxide analysis. Fe2O3 content in study area ranging between maximum 70.4% in point A7 area to minimum 13.4% in point A13 area and the average is 43.53%. Mn in study area ranging between Maximum 4.04% in point A16 area to Minimum 0.16% in point A22 and the average is 1.83%. All these results have been to construct isoconcentration maps of the Iron and Manganese ores their and its distribution in study area and potentiality for future mining works.
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