Exploration and Petrogenesis of Corundum-Bearing Pegmatites: A Case Study in Migif-Hafafit Area, Egypt

A net of pegmatite veins crosscut gneiss and dismembered ophiolitic ultramafic rocks are abundant in the Migif-Hafafit culmination area, South Eastern Desert, Egypt. Some these pegmatites corundum-bearing. Corundum-bearing studied eight localities around complex. The present study aims to integrate field investigation, whole rock corundum chemistry, remote sensing studies, conventional methods detect corundum-bearing pegmatites, which led finding out genesis mineralization. In addition, tectonic regime has been detected using bulk geochemistry. False-color composite (FCCs), band ratio (BR), principal component analysis (PCA), minimum noise fraction (MNF), decorrelation stretch (DS), constrained energy minimization (CEM) image processing algorithms were proposed applied on Landsat-8 OLI, Sentinel-2A data discriminate exposed lithological units area. These structurally controlled following NW-SE direction. host six areas gneisses two others. Gneisses characterized by a steep slope LREEs relative HREEs with week Eu negative anomaly. have both plumasite marundite. On other hand, Al 2 O 3 content up 99.72 wt% pegmatite-gneiss 100 wt.% pegmatite-ultramafics. Corundum is ascribed metamorphic/metasomatic type according its chromosphere. Desilication excess alumina residual melt producing