干旱区生态环境知识资源中心(Arid): Using air-borne gamma ray spectrometry and remote sensing data for detecting alteration zones around Wadi Saqia area, Central Eastern Desert, Egypt

Arid

DOI	10.1016/j.jafrearsci.2021.104181
	Using air-borne gamma ray spectrometry and remote sensing data for detecting alteration zones around Wadi Saqia area, Central Eastern Desert, Egypt
	Ghoneim, S. M.; Nabi, S. H. Abd El; Yehia, M. A.; Salem, S. M.
通讯作者	Ghoneim, SM (corresponding author), Natl Author Remote Sensing & Space Sci NARSS, Geol Div, Cairo, Egypt.
来源期刊	JOURNAL OF AFRICAN EARTH SCIENCES
ISSN	1464-343X
EISSN	1879-1956
出版年	2021
卷号	178
英文摘要	This study presents the air-borne geophysical Gamma Ray Spectrometry data have been used for detecting the alteration zones related to hydrothermal activity. Areas enriched in potassium may indicate the existence of potassic alteration zone that is often associated with hydrothermal alteration accompanied by economic mineral deposits. The radioelements (K (%), eTh (ppm), and eU (ppm)) concentration distribution and the ratios of (K/eTh and K/eU) over the study area were presented. A Potassium Point anomaly map was obtained from the statistical treatment of the K (%), K/eU, and K/eTh spectrometric data. Anomalously High (X+3 sigma or more) areas were delineated and considered the most preferred areas for potassic alteration. If the maximum values exceed the (X+3 sigma) threshold, then (X+2 sigma) or (X+sigma) is applied instead. Sixteen areas were delineated and suggested for the presence of potassic alteration. The F-Parameter of Efimov (K*(eU/eTh)) was also implemented as proved approach for delineating the most preferred areas for hydrothermal alteration. The result of the Potassium point anomaly mapping was compared to that of the F-Parameter technique that was used as reference for validating the results. The sixteen anomalous areas revealed from the Potassium point anomaly technique showed perfect correlation with the areas of highly anomalous F-parameter. Remote sensing study supported by field data and laboratory spectral analyses was also implemented in this study as another useful powerful cost-effective approach for alteration mapping. A field study was conducted; samples from the different observed alterations were collected. The spectral signatures of these samples were measured using the ASD TerraSpec Halo mineral identifier hand-held spectroradiometer. Spectral analyses were performed to obtain the spectral characteristics of the alteration zones of the study are. The end-members were identified through comparing the measured spectra against the United States Geological Survey (USGS) spectral library in ENVI v.5.1. software. The identified end-members include; Kaolinite, Sericite, Montmorillonite, Chlorite, Epidote and iron oxides. Subpixel Mixture Tuned Matched Filtering (MTMF) mapping technique was finally used for mapping the distribution of these end-members on ASTER nine Visible Near Infra-Red (VNIR) and Short Wave Infra-Red (SWIR) bands. The remote sensing data were validated as Semna gold mine and the identified alterations during the field study were successfully mapped by the remote sensing technique. Finally; Most of the delineated areas using the proposed Potassium point anomaly technique were also evidenced by the approached remote sensing technique. Moreover remote sensing suggested more alteration areas than did the gamma ray spectrometry data.
英文关键词	Spectrometric data ASTER MTMF Hydrothermal alteration Mineralization Wadi Saqia Egypt
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000640959600013
WOS关键词	SPECTRAL CHARACTERISTICS ; ALTERATION MINERALS ; ALTERED ROCKS ; MEATIQ AREA ; ASTER DATA ; ARGENTINA ; PATAGONIA ; DEPOSITS ; IRAN
WOS类目	Geosciences, Multidisciplinary
WOS研究方向	Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/350643
作者单位	[Ghoneim, S. M.; Salem, S. M.] Natl Author Remote Sensing & Space Sci NARSS, Geol Div, Cairo, Egypt; [Nabi, S. H. Abd El] Ain Shams Univ, Fac Sci, Geophys Dept, Cairo, Egypt; [Yehia, M. A.] Ain Shams Univ, Fac Sci, Geol Dept, Cairo, Egypt
推荐引用方式 GB/T 7714	Ghoneim, S. M.,Nabi, S. H. Abd El,Yehia, M. A.,et al. Using air-borne gamma ray spectrometry and remote sensing data for detecting alteration zones around Wadi Saqia area, Central Eastern Desert, Egypt[J],2021,178.
APA	Ghoneim, S. M.,Nabi, S. H. Abd El,Yehia, M. A.,&Salem, S. M..(2021).Using air-borne gamma ray spectrometry and remote sensing data for detecting alteration zones around Wadi Saqia area, Central Eastern Desert, Egypt.JOURNAL OF AFRICAN EARTH SCIENCES,178.
MLA	Ghoneim, S. M.,et al."Using air-borne gamma ray spectrometry and remote sensing data for detecting alteration zones around Wadi Saqia area, Central Eastern Desert, Egypt".JOURNAL OF AFRICAN EARTH SCIENCES 178(2021).