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Proceedings Paper

Using remote sensing technique in lithological discrimination and detection of gold-bearing alteration zones at Wadi Defeit area, southeastern desert, Egypt
Author(s): M. F. Sadek; T. M. Ramadan; I. Abu El Leil; S. M. Salem
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Paper Abstract

Wadi Defeit area in the extreme South Eastern Desert of Egypt is occupied mainly by Precambrian ophiolitic and island-arc assemblages. The ophiolitic rocks are principally represented by serpentinite, talc-carbonate and listwaenite thrusted over the metasediments and island-arc schistose metavolcanics and intruded by syn to late tectonics intrusions of gabbro-diorite and monzogranite (G2). For discrimination of the basement rock units covering the study area, tracing the major structural features and identification of the mineralized alteration zones, the ETM+ with 7 bands composition and resolution about 15 m was processed where the geometric corrections and radiometric balancing to the image were carried out. The image enhancement techniques including spatial and spectral enhancement, ratioing and stretching have been applied and different band ratios were testes, the band selection for different ratio images used is based on the spectral signatures of these rocks. The study revealed that, based on the spectral signatures of the different basement rocks forming Gabal Al Adraq area, the RGB band ratio image (5/7, 5/1, 4) is proved to be very effective in the discrimination of the different basement rocks and the gold bearing alteration zones. The gold mineralization is introduced into the listwaenites, alteration zones and quartz veins during the sulfidization processes and the remobilization of gold took place along the thrust zones during listwaenization. This study indicates that the alteration zones in both the metavolcanics and the listwaenites are promising and need more detailed exploration for Au and Ag mineralizations to evaluate their potentiality.

Paper Details

Date Published: 3 October 2006
PDF: 11 pages
Proc. SPIE 6366, Remote Sensing for Environmental Monitoring, GIS Applications, and Geology VI, 63660H (3 October 2006); doi: 10.1117/12.685594
Show Author Affiliations
M. F. Sadek, National Authority for Remote Sensing and Space Sciences (Egypt)
T. M. Ramadan, National Authority for Remote Sensing and Space Sciences (Egypt)
I. Abu El Leil, Al Azhar Univ. (Egypt)
S. M. Salem, National Authority for Remote Sensing and Space Sciences (Egypt)


Published in SPIE Proceedings Vol. 6366:
Remote Sensing for Environmental Monitoring, GIS Applications, and Geology VI
Manfred Ehlers; Ulrich Michel, Editor(s)

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