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Landsat 8 (OLI) ETM+ satellite imagery data are evaluated forimproving and re-mapping the geologic map of Um Gheig area, CentralEastern Desert of Egypt. Different remote sensing techniques includingFCC, band ratio, PCA, supervised classification and spectralcharacteristic analysis were applied on satellite imagery to facilitate thediscrimination of the widely exposed Neoproterozoic basement rocks inthe study area. Best color composite 146 FCC, 762 FCC, band ratio 6/2,4/3, 7/3 and 7/6, 6/5, 4/2 in RGB, as well as PCA 213 and 314 in RGBwere selected and used for detailed mapping of the different lithologicalunits. Spectral characteristic analysis was used to discriminate the rockforming minerals through the different rock units in Umm Gheig area(e.g. amphibole b7/b5, serpentine b5/b7, Quartz b7/b6, muscovite b6/b4and PCA4). The rock units of Um Gheig area are divided four mainlithological units according to field and petrographical studies; ophioliticassociations, foliated metavolcanics, post-granitoids and hammamatsediments, as well as small parts of unmapple metavolcanics andmetgabbro. Ophiolitic associations are subdivided serpentinites,metagabbro, volcanoclastic metasediments and hormblende schist.Granitoids are subdivided El-Deilihimmi granite and Abu Shaddadgranite. Petrographically, serpentinites prevailing by antiguriteserpentinites, metagabrro includes quartz and hornblende gabbro, VCMcomprised different varieties range from biotite schist, biotitehornblende schist, garnet biotite hornblende schist, intercalations ofactionolite schist and highly mylonitic schist, foliated metavolcanicsrepresented by schistose metatuffs and mylonitic schist, metavolcanicsrepresented by meta-andesite and fine metatuff, El-Deilihimmi graniteincludes granodiorite and monzogranite while Abu shaddad granitecomprised alkali feldspar granite and syenogranite, hammamatsediments represented by pebbles of dacite. A new modified geologicalmap is produced for Um Gheig area based on the remote sensing data,field investigation and petrographical description.

delta journal of science

Re-Mapping the Neoproterozoic Basement Rocks of Um Gheig area, Central Eastern Desert, Egypt based on Remote Sensing, Petrography and Field Investigation