REMOTE SENSING-BASED DISCRIMINATION OF HIGHLY FRACTIONATED GRANITE: AN APPLICATION FROM THE HUMR AKARIM AREA, SOUTH EASTERN DESERT, EGYPT
D.H. Hashem1*, Y.S. Badr2, I.M. Abdel Ghani2, C. Zheng3, M.A. Abu El-Rus1, A.A. Khudeir1, H. Abbas1
1 Geology Department, Faculty of Science, Assiut University, Assiut, Egypt
2 Nuclear Materials Authority, P.O. Box 530, Maadi, Cairo, Egypt
3State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi’an, China
Ключевые слова: Remote sensing, Landsat-8, ASTER, Principal component analysis (PCA), Mixture-Tuned Matched-Filtering (MTMF), Post orogenic granite, Mineralization, Granitic pulses
Аннотация
Image processing of multispectral data (Landsat-8 and ASTER) in combination with field studies and petrographic investigations was used for the lithologic mapping of the highly fractionated Humr Akarim (HA) granite pluton and the adjacent area in the Eastern Desert of Egypt. The image processing techniques applied include data transformation techniques such as band ratio, principal component analysis, and minimum noise fraction. Processing of Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) data is suitable for distinguishing the lithologic units of the HA granite pluton, which have similar mineralogy and chemical composition but differ in texture and microstructures. False Color Composite (FCC) image of the principal component based on standard deviation (PC4, PC2, and PC7 in RGB) is the most appropriate processing technique and effectively highlights significant geological features in HA granite pluton. In comparison to the HA granite pluton, analysis of Landsat images is more favorable and accurate in distinguishing the lithologic units, layering, and folding in the surrounding metavolcanoclastic rocks. Verification of the resulting geological map in the field shows high accuracy and reliability. The resulting geological map is more elaborated and detailed compared to previously published maps based only on field observations, petrographic studies, and chemical composition. It is suggests that the high-intensity lineaments zones detected on the Landsat 8 panchromatic band are zones of significant amounts of mineralization.
DOI: 10.15372/GiG2024183 |
