The use of enhanced Landsat-TM image in the characterization of uraniferous granitic rocks in the Central Eastern Desert of Egypt

Rakaiby, M. L. El

doi:10.1080/01431169508954463

Cited by 10 publications

(7 citation statements)

References 9 publications

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“…Landsat TM images have been used with mixed success to map igneous and metamorphic units (e.g., [11,[13][14][15][16][17]), as well as clastic, carbonate, and evaporitic lithologies (e.g., [18][19][20][21][22]). TM data have been applied with some success in the mapping of prominent zones of mineral alteration such as those marked by the presence of abundant oxides and hydroxides (e.g., [23,24]).…”

Section: Discrimination Of Rock Types Using Multispectral Remote Sensmentioning

confidence: 99%

Landsat-TM-Based Discrimination of Lithological Units Associated with the Purtuniq Ophiolite, Quebec, Canada

Leverington

Moon

2012

Remote Sensing

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Abstract:In order to better constrain the utility of multispectral datasets in the characterization of surface materials, Landsat Thematic Mapper (TM) data were evaluated in the discrimination of geological classes in the Cape Smith Belt of Quebec, a greenstone belt that hosts Early Proterozoic units including those of the Purtuniq ophiolite. Ground-based measurements collected for the study area highlight the importance of chemical alteration in controlling the reflectance properties of key geological classes. The spatial distribution of exposed lithologies in the study area was determined through (1) image classification using a feedforward backpropagation neural network classifier; and (2) generation of fraction images for spectral end members using a linear unmixing algorithm and ground reflectance data. Despite some shortcomings, the database of surface cover generated by the neural network classifier is a useful representation of the spatial distribution of exposed geological materials in the study area, with an overall agreement with ground truth of 87.7%. In contrast, the fraction images generated through unmixing are poor representations of ground truth for several key lithological classes. These results underscore both the considerable utility and marked limitations of Landsat TM data in the mapping of igneous and metamorphic lithologies.

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Section: Discrimination Of Rock Types Using Multispectral Remote Sensmentioning

confidence: 99%

Landsat-TM-Based Discrimination of Lithological Units Associated with the Purtuniq Ophiolite, Quebec, Canada

Leverington

Moon

2012

Remote Sensing

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“…A sampling of relevant publications includes geologic mapping and mineral targeting in Precambrian terrain in India [9]; mapping mafic and ultramafic rocks in the Oman Ophiolite, and targeting hydrothermal alteration zones related to possible massive sulfide copper deposits [10] (band 7 data were crucial for detecting hydrothermal alteration); mapping ophiolite lithologies in Cyprus, and delineation of a critical lithologic boundary to target possible massive sulfide deposits (all TM bands were needed to distinguish two types of lava flows [11]). Several geologic mapping studies in the Arabian Shield and Middle East focused on mineral exploration for uranium, gold, copper, and other metal deposits [12,13]; again, the availability of SWIR data was critical to detect hydrothermal alteration. In 1999, Sabins [14] published a comprehensive review of the application of remote sensing data for mineral exploration.…”

Section: Early Geologic Applications Of Spaceborne Instrumentsmentioning

confidence: 99%

Twenty Years of ASTER Contributions to Lithologic Mapping and Mineral Exploration

Abrams

Yamaguchi

2019

Remote Sensing

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The Advanced Spaceborne Thermal Emission and Reflection Radiometer is one of five instruments operating on the National Aeronautics and Space Administration (NASA) Terra platform. Launched in 1999, the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) has been acquiring optical data for 20 years. ASTER is a joint project between Japan’s Ministry of Economy, Trade and Industry; and U.S. National Aeronautics and Space Administration. Numerous reports of geologic mapping and mineral exploration applications of ASTER data attest to the unique capabilities of the instrument. Until 2000, Landsat was the instrument of choice to provide surface composition information. Its scanners had two broadband short wave infrared (SWIR) bands and a single thermal infrared band. A single SWIR band amalgamated all diagnostic absorption features in the 2–2.5 micron wavelength region into a single band, providing no information on mineral composition. Clays, carbonates, and sulfates could only be detected as a single group. The single thermal infrared (TIR) band provided no information on silicate composition (felsic vs. mafic igneous rocks; quartz content of sedimentary rocks). Since 2000, all of these mineralogical distinctions, and more, could be accomplished due to ASTER’s unique, high spatial resolution multispectral bands: six in the SWIR and five in the TIR. The data have sufficient information to provide good results using the simplest techniques, like band ratios, or more sophisticated analyses, like machine learning. A robust archive of images facilitated use of the data for global exploration and mapping.

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“…The tectonic and geochemical characteristics of the studied granites indicated that their magmas originated in post orogenic and within-plate tectonic environment (Greenberg, 1981 andAttawyia, 1990). Some few works dealing with the image processing techniques and geological interpretations using satellite images for the study areas had been achieved (El Rakaiby and Shalaby, 1992, El Rakaiby, 1995, El Rakaiby 1997, Bishta, 2004and Mostafa and Bishta, 2005.…”

Section: Geologymentioning

confidence: 99%

Integration of Geologic and Remote Sensing Studies for the Discovery of Uranium Mineralization in Some Granite Plutons, Eastern Desert, Egypt

Shalaby¹,

Bishta²,

Roz³

et al. 2010

ear

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The main objective of this research is to integrate geology with remote sensing techniques to establish common characteristic features leading to the recognition of other uranium mineralizations within the Pan-African younger granites of the Eastern Desert of Egypt. The association of aplites, quartz and jasperoid veins and lamprophyric dykes as well as alteration processes throughout and near the mineralized sectors appear to play an important role in the distribution and localization of the mineralization. investigations confirm the presence of uranophane mineral as uranyl silicates. The uranophane mineral is found in close association with hematite, quartz, calcite and chlorite. Relics of corroded pyrite grains are disseminated in the groundmass and filling some vugs and cavities. The uranium mineralization is found adsorbed and enclosed around pyrite. This may indicate that the presence of pyrite created a reduced environment favourable for the precipitation and fixation of uranium.

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The use of enhanced Landsat-TM image in the characterization of uraniferous granitic rocks in the Central Eastern Desert of Egypt

Cited by 10 publications

References 9 publications

Landsat-TM-Based Discrimination of Lithological Units Associated with the Purtuniq Ophiolite, Quebec, Canada

Landsat-TM-Based Discrimination of Lithological Units Associated with the Purtuniq Ophiolite, Quebec, Canada

Twenty Years of ASTER Contributions to Lithologic Mapping and Mineral Exploration

Integration of Geologic and Remote Sensing Studies for the Discovery of Uranium Mineralization in Some Granite Plutons, Eastern Desert, Egypt

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