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Utilization of ASTER and OLI data for lithological mapping of Nugrus-Hafafit area, South Eastern Desert of Egypt

  • Ashraf Emam
  • Zakaria Hamimi
  • Abdelhamid El-Fakharani
  • Ezzat Abdel-Rahman
  • Juan Gomez Barreiro
  • Mohammed Y. Abo-Soliman
S. I. Geology of Africa
  • 70 Downloads
Part of the following topical collections:
  1. New Advances and Research Results on the Geology of Africa

Abstract

Lithological discrimination of Neoproterozoic rocks occupying Nugrus-Hafafit area, South Eastern Desert of Egypt, has been carried out using Operational Land Imager (OLI) and Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) sensors’ imagery data. The applicable processing enhancement techniques include optimum index factor (OIF), band ratioing, principal component analysis (PCA), and minimum noise fraction (MNF) transform. The area comprises varieties of low-grade metamorphosed ophiolitic mélange and island-arc rocks, thrusting over high-grade metamorphic gneissic core complexes, and intruded by syn-, late-, and post-tectonic granitoids. The OLI band ratio 6/7 discriminates clearly the ophiolitic serpentinites-talc-carbonate rocks, while 4/5 ratio image is able to separate between mafic and felsic rocks. Moreover, the ASTER band ratio 6/8 is used to distinguish the amphibole-bearing rocks, including amphibolite and hornblende gneiss. The OLI and ASTER second principal component (PC2) images reflect the contrast spectral behavior of ophiolitic mélange rocks through visible-near-infrared (VNIR) and shortwave (SWIR) regions. The OLI-PC3 shows the ability to delineate the Fe-rich rocks, including amphibolite and metamafics, while ASTER-PC3 is effective for quartz-feldspathic granites and psammitic gneisses. Visual interpretation and integration of processed data with petrography and field investigation resulted in complete differentiation for the different lithologies and creation of a new detailed geological map of Nugrus-Hafafit area.

Keywords

ASTER and OLI data Lithological mapping Band ratioing PCA and MNF transform Nugrus-Hafafit 

Notes

Acknowledgements

This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors. The authors highly acknowledge the Geology Department, Faculty of Science, Aswan University for allowing the field and microscopic facilities.

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Copyright information

© Saudi Society for Geosciences 2018

Authors and Affiliations

  • Ashraf Emam
    • 1
  • Zakaria Hamimi
    • 2
  • Abdelhamid El-Fakharani
    • 1
    • 3
  • Ezzat Abdel-Rahman
    • 1
  • Juan Gomez Barreiro
    • 4
  • Mohammed Y. Abo-Soliman
    • 1
  1. 1.Geology Department, Faculty of ScienceAswan UniversityAswanEgypt
  2. 2.Geology Department, Faculty of ScienceBenha UniversityBenhaEgypt
  3. 3.Department of Structural Geology and Remote Sensing, Faculty of Earth SciencesKing Abdulaziz UniversityJeddahSaudi Arabia
  4. 4.Geology DepartmentSalamanca UniversitySalamancaSpain

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