Arid
DOI10.1007/s12665-017-7152-1
Reconnaissance geochemical survey in the Marahiq area, Wadi Allaqi region, south Egypt: a preliminary assessment of stream sediments for gold placer and environmental hazard
Darwish, Mohamed Abdallah Gad
通讯作者Darwish, Mohamed Abdallah Gad
来源期刊ENVIRONMENTAL EARTH SCIENCES
ISSN1866-6280
EISSN1866-6299
出版年2017
卷号76期号:23
英文摘要

The Marahiq area represents a portion of the Pan-African belt from the Neoproterozoic age in south Egypt and includes metamorphosed ultramafic rocks, metavolcanic rocks, and granodiorite pluton. The area is characterized by the ancient abandoned Au mine and the recent active talc mines. The present paper provides a preliminary assessment of stream sediments for gold (Au) placer and environmental hazard. Steam sediments from 36 stations were analyzed using ICP-MS for determining the concentration of 53 elements. Various statistical techniques, graphical representations, a set of complementary sediment quality assessment methods, and different mapping methods have been applied. The results showed that Au and the investigated elements were influenced by long history of the ancient mining activities and weathering processes, leading to elevate Au and some heavy metal(loid)s concentrations and exhibit enrichment ratios as follows: Te > As > Au > Cu > Cd > Co > Ni > V. Whereas Cd, Co, and V were attributed to geogenic origin, As, Au, Cu, Ni, and Te were derived from anthropogenic mining activities. It is found that the anomalies of Au and the element of interest are indicative of Au placer and point out a new perspective Au-sulfide mineralization hosted along the favorable tectonic zones that were the main source of Au placer. Both As and Te are good pathfinders to explore Au placer and related mineralization. Environmentally, the excess of As, Cu, Ni, and Te could generate moderate levels of contamination and low level of ecological risk in the sediments. Although As, Cu and Ni posed medium-low potentially adverse effects and low toxicity levels, they cannot cause harmful influences on biological life. Accordingly, streambed sediments are considered as safe and acceptable as inoffensive materials for environmental management. Overall, this study is as reference values for governmental organizations for appraising future environmental pollution in the area. Also, it is fruitful for Au placer and promising with success for Au exploration along the shear zones and strike-slip faults.


英文关键词Geochemical survey Stream sediments Gold placer Environmental hazard Marahiq area South Egypt
类型Article
语种英语
国家Egypt
收录类别SCI-E
WOS记录号WOS:000440342500001
WOS关键词HEAVY-METAL CONTAMINATION ; FRESH-WATER ECOSYSTEMS ; TRACE-ELEMENTS ; QUALITY GUIDELINES ; ESTUARINE SEDIMENTS ; ENRICHMENT FACTORS ; CONTINENTAL-CRUST ; MARINE-SEDIMENTS ; EASTERN DESERT ; SOILS
WOS类目Environmental Sciences ; Geosciences, Multidisciplinary ; Water Resources
WOS研究方向Environmental Sciences & Ecology ; Geology ; Water Resources
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/198687
作者单位Aswan Univ, Fac Sci, Geol Dept, Aswan 81528, Egypt
推荐引用方式
GB/T 7714
Darwish, Mohamed Abdallah Gad. Reconnaissance geochemical survey in the Marahiq area, Wadi Allaqi region, south Egypt: a preliminary assessment of stream sediments for gold placer and environmental hazard[J],2017,76(23).
APA Darwish, Mohamed Abdallah Gad.(2017).Reconnaissance geochemical survey in the Marahiq area, Wadi Allaqi region, south Egypt: a preliminary assessment of stream sediments for gold placer and environmental hazard.ENVIRONMENTAL EARTH SCIENCES,76(23).
MLA Darwish, Mohamed Abdallah Gad."Reconnaissance geochemical survey in the Marahiq area, Wadi Allaqi region, south Egypt: a preliminary assessment of stream sediments for gold placer and environmental hazard".ENVIRONMENTAL EARTH SCIENCES 76.23(2017).
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