Abstract
Gala En Nahal area constitute late Precambrian Alpine-type mafic-ultramafic rocks, considered as ophiolites masses. These ophiolite masses are deformed, sheared and dismembered. They consist of serpentinized chromitiferous ultrabasic rocks, metagabbro, diorite and dykes of various composition. Later talc magnesite schist and biribrite are formed as an alteration product of the mafic ultra-mafic rocks. Industrial minerals such as chromite, talc, asbestos and magnesite have been reported. Samples are taken from biribrite rock and subjected to (XRF) and (AAS) analysis. The results of analysis show sigificant values for Au, PGE, Ni, Co and Ag Analysis of Talc-carbonate rocks also show ore minerals of Ni-Co arsenide, pyrite, and chalcopyrite silica-carbonate stock works are surface criteria for mineralization.
Highlights
Gala En Nahal area is located in the South-Western part of Gadarif State near the border line between the Sudan and Ethiopia and at the northern side of the alluvial plains of the Blue Nile-Dinder and Attshan rivers.Longitudes 34°52ʹ - 35°01ʹ E and latitudes 13°28ʹ-13°35ʹ NIt lies about 65 km to Gadarif town, 700 km SW to Port Sudan, 450 km NE Khartoum.Gala En Nahal complex represent late – Precambrian Alpine – type mafic – ultramafic rocks
These ultramafic complex was considered as a part of postulated ophiolite zone, extending from Kenya to Arabia Figure 1 through Ethiopia, Sudan and Egypt
Iii- Characteristic mineral and element assemblages usually associated with ophiolitic viz: pod form chromite deposits, sulphides of Ni, Cu,Co
Summary
Longitudes 34°52ʹ - 35°01ʹ E and latitudes 13°28ʹ-13°35ʹ N It lies about 65 km to Gadarif town, 700 km SW to Port Sudan, 450 km NE Khartoum. Gala En Nahal complex represent late – Precambrian Alpine – type mafic – ultramafic rocks. These ultramafic complex was considered as a part of postulated ophiolite zone, extending from Kenya to Arabia Figure 1 through Ethiopia, Sudan and Egypt. Abdel Rahman1983 (1) considered Gala En Nahal – as ophiolite – fragment disposed along or near an ancient geosuture. This ophiolite occurs along a major linear belt, which according to (Vail, J.R. 1983) (8). This ophiolite occurs along a major linear belt, which according to (Vail, J.R. 1983) (8). indicates a subduction zone, which had been disrupted by igneous intrusions and offset by faults
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