Re-Mapping the Neoproterozoic Basement Rocks of Um Gheig area, Central Eastern Desert, Egypt based on Remote Sensing, Petrography and Field Investigation | ||||
| Delta Journal of Science | ||||
| Article 5, Volume 41, Issue 1, June 2019, Page 39-54 PDF (12.46 MB) | ||||
| Document Type: Research and Reference | ||||
| DOI: 10.21608/djs.2020.139228 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
| Mohamed A. Abd El-Wahed1; El Metwaly Lebda2; Samir Kamh1; Mohamed Attia* 2 | ||||
| 1Geology Department, Faculty of Science, Tanta University, 31527 Tanta, Egypt | ||||
| 2Geology Department, Faculty of Science, Kafrelsheikh University, Kafrelsheikh, Egypt | ||||
| Abstract | ||||
| Landsat 8 (OLI) ETM+ satellite imagery data are evaluated for improving and re-mapping the geologic map of Um Gheig area, Central Eastern Desert of Egypt. Different remote sensing techniques including FCC, band ratio, PCA, supervised classification and spectral characteristic analysis were applied on satellite imagery to facilitate the discrimination of the widely exposed Neoproterozoic basement rocks in the 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 RGB were selected and used for detailed mapping of the different lithological units. Spectral characteristic analysis was used to discriminate the rock forming minerals through the different rock units in Umm Gheig area (e.g. amphibole b7/b5, serpentine b5/b7, Quartz b7/b6, muscovite b6/b4 and PCA4). The rock units of Um Gheig area are divided four main lithological units according to field and petrographical studies; ophiolitic associations, foliated metavolcanics, post-granitoids and hammamat sediments, as well as small parts of unmapple metavolcanics and metgabbro. Ophiolitic associations are subdivided serpentinites, metagabbro, volcanoclastic metasediments and hormblende schist. Granitoids are subdivided El-Deilihimmi granite and Abu Shaddad granite. Petrographically, serpentinites prevailing by antigurite serpentinites, metagabrro includes quartz and hornblende gabbro, VCM comprised different varieties range from biotite schist, biotite hornblende schist, garnet biotite hornblende schist, intercalations of actionolite schist and highly mylonitic schist, foliated metavolcanics represented by schistose metatuffs and mylonitic schist, metavolcanics represented by meta-andesite and fine metatuff, El-Deilihimmi granite includes granodiorite and monzogranite while Abu shaddad granite comprised alkali feldspar granite and syenogranite, hammamat sediments represented by pebbles of dacite. A new modified geological map is produced for Um Gheig area based on the remote sensing data, field investigation and petrographical description. | ||||
| Keywords | ||||
| Um Gheig; Landsat8(OLI); CED; BasementRocks | ||||
|
Statistics Article View: 213 PDF Download: 1,469 |
||||
