Structural and litho-tectonic controls on Neoproterozoic base metal sulfide and gold mineralization in North Hamisana shear zone, South Eastern Desert, Egypt: The integrated field, structural, Landsat 7 ETM + and ASTER data approach

Ibrahim, W. S.; Watanabe, Kenji; Yonezu, Kotaro

doi:10.1016/j.oregeorev.2016.05.012

Cited by 34 publications

(18 citation statements)

References 32 publications

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“…The FFC image is formed by combining visible and infrared bands or by applying infrared bands only, which were assigned to the three principal colours Red‐Green‐Blue (RGB). The ASTER (8/5, 5/4 and 7/8 as RGB; Ibrahima, Watanabeb, & Yonezu, ) FCC image is very effective in the lithological discrimination of the study area, where the ophiolite rocks appear in dark blue, island arc (metasediments and metavolcanics) has pale to yellowish blue, granitoids has yellow to reddish yellow and Natash volcanics and Nubian sandstones display pale yellow to yellow colour (Figure b).…”

Section: Remote Sensing Data Analysismentioning

confidence: 99%

Geology and mapping of laterites, South Eastern Desert, Egypt: Based on field and ASTER data approach

et al. 2019

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The area between wadi Dungash-wadi Shait in the South Eastern Desert of Egypt comprises ophiolitic nappes structurally overthrust on island arc-related metasedimentary-metavolcanic rocks, which are traversed by several granitoids, gabbroic and basaltic rocks. This paper focuses on uncovering laterite zones utilizing field geological, mineralogical and geochemical attributes of the investigation region. Laterites are distributed at the border between Neoproterozoic and Phanerozoic rocks. The laterite deposits are developed after the emplacement of Natash flows as a result of lateritization process in tropical regions, during the Late Cretaceous. The laterite sections comprise a sequence from the top to the base, oxide laterite, plasmic laterite, saprolith and bedrock. The laterite sections consist of hematite and goethite together with small quantity of gibbsite. Geochemically, the laterite profiles are marked by an increase in Fe content and decrease in Si from the top to the bottom. Fe 2 O 3 is the most abundant with 30.09-54.67 wt.%, Al 2 O 3 vary from 18.01 to 32.78 wt.%, and SiO 2 vary from 15.05 to 19.43 wt.%.Advanced Spaceborne Thermal Emission and Reflection Radiometer images are utilised to characterize a primer laterite zone. The band ratio 4/5 is found to be efficient in defining the laterite soil in the studied area.

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Section: Remote Sensing Data Analysismentioning

confidence: 99%

Geology and mapping of laterites, South Eastern Desert, Egypt: Based on field and ASTER data approach

et al. 2019

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“…The false color composites (FCCs) of band combinations and ratios are applied to enhance discriminations between different rock units. The interpretation of FCC images depends on how these bands are assigned to the three principal colors RGB used for the image display which in turn depends on the spectral characteristics of rocks (Ibrahim, Watanabe, & Yonezo, 2016). The spectral signature analysis is helpful to select the best bands in the ratio techniques.…”

Section: Band Ratio Methodsmentioning

confidence: 99%

Lithological mapping in Sangan region in Northeast Iran using ASTER satellite data and image processing methods

Rezaei

Hassani

Moarefvand

et al. 2019

Geology, Ecology, and Landscapes

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Lithological mapping using satellite images, particularly the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) data help in effectively defining the best initial targets for regional exploration. ASTER data allow for the discrimination of rock units in the broader region. This research work is focused on the use of remote sensing techniques for geological mapping using ASTER satellite image and generating a geological map of Sangan region. The study area is located in southeast of Khorasan-e-Razavi province and at the eastern edge of the Khaf-Kashmar-Bardskan Volcano-Plutonic Metallogenic Belt in northeast Iran. Band ratio (BR), spectral angle mapper (SAM) and support vector machines (SVMs) methods were used for classifying the main lithologic units in Sangan region. The results of BR, SAM and SVM techniques were quantitatively compared with geological boundaries mapped in the field showing an accuracy of nearly 79 %. SVMs method, in comparison to conventional methods of classification, was known to provide superior results. As the final result of this research, integration of remote sensing and field investigations led to generating high accuracy geological map in the Sangan region. Application of the methods has invaluable implications for geological mapping and mineral exploration in inaccessible regions.

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“…They used ASTER data to map the geology and alteration mineralogy of the region to define possible copper targets. Ibrahim et al [128] applied ASTER and Landsat data, with field data in the North Hamisana shear zone, Egypt, to detect structural and lithologic controls for base metal sulfide deposits. By combining information extracted from ASTER and Landsat data, Zhang et al [129] mapped hydrothermal alteration minerals around the Duolong copper deposit in Tibet.…”

Section: Aster Data Applied To Porphyry Copper Explorationmentioning

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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Structural and litho-tectonic controls on Neoproterozoic base metal sulfide and gold mineralization in North Hamisana shear zone, South Eastern Desert, Egypt: The integrated field, structural, Landsat 7 ETM + and ASTER data approach

Cited by 34 publications

References 32 publications

Geology and mapping of laterites, South Eastern Desert, Egypt: Based on field and ASTER data approach

Geology and mapping of laterites, South Eastern Desert, Egypt: Based on field and ASTER data approach

Lithological mapping in Sangan region in Northeast Iran using ASTER satellite data and image processing methods

Twenty Years of ASTER Contributions to Lithologic Mapping and Mineral Exploration

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