| In the modern society,the lack of mineral resources restricts the development of human society.Therefore,the discovery and the determination of mineral resources is the real problem that needs to be solved in urgent.Gansu Province is located in the northeastern margin of the Qinghai-Tibet Plateau,the typical metallogenic belts of Qilian Mountain,Beishan Mountain,Qinling Mountains are distributed in this area.Gansu is a major mineral resources province in China with excellent mineralization conditions and rich mineral resources.In recent years,Gansu Province has made great achievements in the in the exploration of coal,nonferrous metals,precious metals and other minerals,moreover,determined and submitted a large number of mineral producing areas.However,the overall geological work is in less-developed condition.The study area is located in the southern Qilian block of the Qaidam-Qilian plate and belongs to the gold-lead-zinc-copper-nickel-tungsten-chrome metallogenic belt(?-16)of the Caledonian copper-lead-zinc-silver-chromium-asbestos metallogenic belt(?-7)in the southern Qilian Mountain.Up to now,we have found a large number of mineral deposits through the geochemical exploration work,such as gold mine in Jiagongtai and Qieergande,copper mine in Huashi valley and so on.Therefore,it can be seen that the study area has a good prospecting potential.The river system is developed in the study area,which is suitable for the development of stream sediment survey in the scale of 1: 50000.In this study,stream sediment was taken as the research object,we mainly studied it migration,enrichment and evolution pattern by measuring the contents and spatial distribution of elements in the water samples.Moreover,combined with geophysical prospecting,mineralization and systematic research,we determined abnormity and then screened out those induced by mines in order to achieve the purpose of prospecting.The main research contents and achievements of this thesis are as follows:(1)Contents and distribution pattern of a total of 15 elements including Au,Bi,Hg,As,Cu,Ag,Sn,Zn,Co,Mo,Ni,Pb,Sb,W and Fe2O3 were investigated through stream sediment measuring in the scale of 1: 50000.229 single element abnormalities and 7 comprehensive abnormalities were determined which contains four gold-arsenic-mercury-antimony typed,two tungsten-tin-bismuth-molybdenum typed and one copper-lead-zinc-silver typed.(2)Through ground high-precision magnetic measurement in scale of 1: 50000,we basically determined the characteristics of magnetic field in the study area,which provided geophysical basis for the basic geophysical research,prospecting target optimization and other geological related work in the study area.Moreover,a certain understanding of the physical properties of the study area has significance in geological prospecting.We determined three major magnetic abnormalities,carried out abnormal verification work and also made the initial interpretation of the abnormalities.(3)Mineral inspection work were carried out for the seven comprehensive abnormalities.Through inspection of geophysical-chemical profile in scale of 1: 5000,we found out the abnormality reproducibility of Au in comprehensive abnormalities of HS-1,HS-3,HS-4,HS-4 and HS-6 were good.(4)We carried out key inspection work on areas with good abnormality reproducibility,20 mine or mineralization sites were revealed through the surface engineering projects,including 2gold mines,16 gold mineralization sites and 2 titanium mineralization sites.(5)According to the metallogenic geological features,ore-controlling conditions,metallogenic regularity,mine(mineralization)sites and the distribution of geophysical and geochemical abnormalities,the study area is divided into two B-class metallogenic prospecting areas and two C-class metallogenic prospecting areas.(6)Four prospecting targets were determined in the metallogenic prospecting area according to the metallogenic geological conditions,features of geophysical and geochemical abnormalities and so on. |
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