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Geochemical characteristics of stream sediments and prospecting prospects in Dahongshan-Xijianquan Area,Beishan,Gansu

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  • Fourth Institute of Geological and Mineral Exploration of Gansu Provincial Bureau of Geology and Mineral Resources|Fourth Institute of Geological and Mineral Exploration of Gansu Provincial Bureau of Geology and Mineral Resources|Fourth Institute of Geological and Mineral Exploration of Gansu Provincial Bureau of Geology and Mineral Resources|Fourth Institute of Geological and Mineral Exploration of Gansu Provincial Bureau of Geology and Mineral Resources
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Abstract:

150 000 stream sediment survey was carried out in Dahongshan-Xijianquan Area,and 10 567 samples were collected with sample grain size varying from -4 meshes to +20 meshes.Through sample analysis and mathematical statistics,the geochemical characteristics of the ore-forming elements were studied,in total delineating 744 single element anomalies,4 combination anomalies and 24 comprehensive anomalies.The comprehensive anomalies are classified and ranked according to the anomaly inspection and evaluation results.Based on that,4 prospecting prospects dominated by Au,Pb,Zn,W and Mo were pided according to geological background and mineral distribution characteristics,and their ore-forming potentials were preliminarily evaluated,pointing out that the alterated rock type gold deposits,continental facies volcanic-subvolcanic thermal fluids type lead zinc polymetallic deposits and magmatic thermal fluids type tungsten molybdenum deposits are the deposit types that have ore-forming potentials.

Keywords:

stream sediment;alterated rock type gold deposit;magmatic thermal fluids type tungsten molybdenum deposit;prospecting prospect;Dahongshan-Xijianquan Area