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geochemical Stream Sediment survey in the Wadi Umm Rilan Area,South Eastern Desert,Egypt:A New Occurrence for Gold Mineralization

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Acta Geologica Sinica(English Edition) 2017年第3期91卷 1041-1062页

作者： Mohamed Abdallah Gad DARWISH Geology Department Faculty of ScienceAswan University

The present paper investigates the stream sediment geochemistry, behavior of gold and associated elements, delineates Au-anomalous sites and defines related sources in the Wadi Umm Rilan area. Fifty three major and trace elements were analyzed using ICP-MS and treated applying various statistical and mapping techniques. The results showed a significant difference of mean and median Au and most chemical elements in the three portions of the area, and higher values were recorded in the western portion. Furthermore, Au-anomalous sites appeared in upper and lower parts of the Wadi Umm Rilan, along the tributaries of metavolcanic unit and near granitoid contacts. This indicates the main source of Au mineralization is related to emplacement of granitoid plutons and accompanying hydrothermal solutions. There are significant indications for the presence of more than one mineralization event forming a probable single major episode of mineralization in the area, involving Au, Pb and U mineralizations. Geology, geomorphologic aspects and weathering processes could control stream sediment geochemistry, anomalies of Au and associated elements, elemental association and their dispersion patterns. Therefore, the area is fruitful and regarded as a promising target for Au exploration, using Ag, As, Sb, Cd, Cs, and TI as pathfinder elements.

关键词： geochemical survey stream sediments Au mineralization Wadi Umm Rilan area southEastern Desert Egypt

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Features of sampling stream sediments of large river valleys under cryolithogenesis conditions in the Balygychan-Sugoy trough,North-East of Russia

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Acta Geochimica 2024年第4期43卷 638-660页

作者： Artem S.Makshakov Raisa G.Kravtsova A.P.Vinogradov Institute of Geochemistry Siberian Branch of the Russian Academy of SciencesFavorskiy Str 1AIrkutskRussia 664033

Comprehensive research has been implemented to raise the efficiency of the geochemical survey of stream sediments(SSs)that formed under the cryolithogenesis *** authors analysed the composition,structure and specific features of the formation of exogenous anomalous geochemical fields(AGFs)identified through SSs of large river valleys of IV *** our case,these were the valleys of Maly Ken,Ken and Tap *** rivers are located in the central and southern parts of the Balygychan-Sugoy trough enclosed in the Magadan region,North-East of *** authors proposed a new technique to sample loose alluvium of SSs in the large river valleys along the *** profiles were located across the *** AGFs of Au,Ag,Pb,Zn,Sn,Bi,Mo and W were *** between elements have been *** elements are the main indicator elements of Au-Ag,Ag-Pb,Sn-Ag,Mo-W and Sn-W mineralization occurring on the sites under *** results obtained were compared with the results of geochemical surveys of *** is concluded that the AGFs recognized along the profiles reflect the composition and structure of eroded and drained ore zones,uncover completely and precisely the pattern of element distribution in loose sediments of large water *** alluvium fractiongeochemical survey of SSs performed at different scales both in the North-East of Russia,as well as other regions with similar climatic conditions,where the SSs are formed under the cryolithogenesis conditions.

关键词： Stream sediments Large river valleys geochemical fields Mineralization Indicator elements geochemical survey

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Geological and geochemical Investigation of Low Grade Basement Rocks: Implication to Human Health in and around Asgeda Tsimbla, Western Tigray, Northern Ethiopia

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Journal of Geoscience and Environment Protection 2016年第8期4卷 60-75页

作者： Jemal Ahmed Kassa Amare Department of Earth Science University of Samara Samara Ethiopia Department of Earth Science University of Mekelle Mekelle Ethiopia

The increase in the number of liver related disease patients from north western region of Ethiopia has been an environmental health issue of national concern. As the disease is restricted to a specific geographical terrain, particularly to Shire area, northwestern dry zone of the country, detail research studies are required to identify possible etiology and risk factors. The aim of the study is to determine the level of trace element and heavy metal concentrations and distributions in water and stream sediments of the area and identify the possible sources in relation to human health. During the study, geochemical sampling (20 water, 20 stream sediment and 6 rock samples) was carried out in March 2011. The collected samples were analyzed for their major and trace element contents using ICP-MS, ICP-OES, Ion Chromatography (IC), and XRF. Analytical data were organized and treated using Excel, SPSS, ArcGIS and Aquachem softwares. Analytical data results with respect to trace element contents in surface and ground waters are compared with the Maximum Acceptable Concentration or Maximum Allowable Concentration (MAC) of World Health Organization (WHO) and Ethiopian standards for drinking water. The comparison reveals that there are problematic elements that pass over the quality standards set for drinking water. One of these is: Bromine (Br), for which 100% all samples have value above 0.01 mg/l and up to 1.475 mg/l. Other problematic elements including aluminum (Al)—30%, fluorine (F)—20%, arsenic (As)—10%, and nitrate (NO3)—10% are examples of elements which have above WHO-MAC for drinking water. Selenium (Se) deficiency may be the other problematic element in the area for its deficiency is associated with liver damage and heart muscle disorder. The metal contaminations (i.e. heavy metals) were also evaluated by world geochemical background value in average shale and sediment quality guideline proposed by US EPA. The concentration of Co and Cr exceeded average shale val

关键词： Liver Disease Environmental Health geochemical survey Maximum Acceptable Concentration (MAC)

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