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Tanta University (2019)

Structural and Petrological Studies on Um Gheig Area, Eastern Desert, Egypt, Using Remote Sensing and GIS Data

Awad, Mohamed Ahmed Attia.

Titre : Structural and Petrological Studies on Um Gheig Area, Eastern Desert, Egypt, Using Remote Sensing and GIS Data

Auteur : Awad, Mohamed Ahmed Attia.

Etablissement de soutenance : Tanta University

Grade : Master in Science (Geology) 2019

Résumé partiel
Um Gheig area is delimited by the latitudes (25◦ 39’ N and 25◦ 45’ N), longitudes (34◦ 20’ E and 34◦ 29’ E) and located at the eastern part of the Eastern Desert of Egypt. The study area dissected by several wadis (e.g. W. Um Gheig, W. Umm Luseifa, W. Wizar, W. Kab Ahmed and W. Umm shaddad) which drain into the Red Sea to the east. The granitic units represent the highest relief in the area. According to the Field studies, the study area can divided into four main rock units, they are from the oldest to the youngest : ophiolitic associations, foliated metavolcanics, granitoids and hammamat sediments as well as some unmapple units of metagabbros and metavolcanics. Ophiolitic associations considered the oldest rock unit and form the largest part of the study area. Based on the field and petrographic investigation, the ophiolitic association subdivided into serpentinites, metagabbros, volcanoclastic metasediments and hornblende schist. Microscopically, the different rock units show several varieties through the petrographic description. Serpentinites comprised antigorite serpentinite with pyroxene relics, antigorite serpentinite and talc carbonate serpentinite. Metagabbros subdivided into hornblende metagabbro and metagabbro with slightly high amount of quartz. Volcanoclastic metasediments includes biotite schist, biotite hornblende schist, garnet biotite hornblende schist, highly mylonitic schist and actionolite schist. Foliated metavolcanics include schistose metatuffs and mylonitic schist. Metavolcanics subdivided according to microscopic investigation into metaandesite and fine metatuff. Granitoids represented by El Deilihimmi granite that includes cataclastic monzogranite and granodiorite as well as syenogranite and alkali feldspar granite of Gabal Umm Shaddad. Hammamat sediments consist mainly conglomerate and greywacke. The pebbles and boulders in conglomerate consist mainly of acid volcanic, felsites, basalt and tuffs as well as subordinate metamudstone. Landsat 8 (OLI) satellite imagery data are successfully used for detailed lithological mapping of Um Gheig area. Different remote sensing techniques such as false compination color (FCC), band ratio, principle component analysis (PCA) and supervised classification were applied on satellite imagery to facilitate the discrimination of the widely exposed lithological units in the study area. The best color composite 432 FCC, 126FCC, 146 FCC and 762 FCC in RGB, band ratio 6/2, 4/3, 7/3 - 7/6, 6/5, 4/2- 7/5, 2/3, 5/6 and 1/4, 3/6, 5/7in RGB, were selected and successfully used for detailed mapping of the different lithological units exposed in the study area. PCA 213, 314, 236 and 321 in RGB used for the accurate delineation of the boundaries between these rock units and Supervised image classification that used to improve the geologic map of Um Gheig area and produce new modified geololgical map of the study area as well as mineral detection. A total of 307 representative spot microprobe analyses of some selected minerals including amphibole, plagioclase, chlorite, epidote, muscovite, biotite, magnetite, hematite, titanite and ilminite were carried out. The raw data were recalculated to obtain the structural formulae and the probable classification diagrams using Minepet software.

Présentation étendue (EULC)

Page publiée le 6 avril 2020