Soil geochemical characteristics and metallogenic prognosis of Caogentai area in Kelastai basin,Inner Mongolia
Based on the full understanding of the geological characteristics of the area,a 1∶10000 scale soil geochemistry survey was carried out in order to optimize the favorable areas for prospecting in Caogentai area of Kelastai basin.Some 2500 soil samples related to element characteristic parameters were obtained.The content and fractal characteristics of Cu,Pb,Zn,Ni,W,Mo,U,Th,Au,Ag,Sn micronutrient indicated that Mo,Ag,Pb and Zn are favorable elements for mineralization.The 1:10000 soil signal element anomaly of 11 elements in the study area were delineated,they are 3(Ag),3(Cu),4(Mo),4(Pb),2(U)and 3(Zn),Ag,Mo,Pb,Zn have Ⅲ concentration bands.By using SPSS 22 statistical software,the data dimension of 11 kinds of elements was reduced,and four groups of element combinations of Ag-Pb-Zn,U-TH-W,Cu-Ni and Mo-Sn,were divided.The content-frequency fractal method was employed to process data of single element.The anomaly lower limits of element associations were calculated by using the cumulative frequency method.Based on the superimposition of anomaly maps of single element,element associations and the combination of element anomaly characteristics and geological ore-forming conditions,5 prediction areas were delineated.The evaluation of metallogenic prospect shows that the ore-forming potential of Mo,Ag,Pb and Zn in Caogentai area is high.Based on the ore-forming geological characteristics,it was considered that the NE-trending tectonic alteration zone is favorable for ore-forming,the late intrusive rhyolite porphyry dykes are favorable intrusions for mineralization,and the A-1 and B-2 prediction areas are the key exploration areas for Ag-Pb-Zn,and the B-1 prediction area is the key exploration area for cu-polymetallic deposits,the polymetallic deposits in the A-1 prediction area are of hydrothermal alteration belt type,and the polymetallic deposits in the B-1 prediction area are of volcanic rock type.The result shows that the soil geochemical anomaly in the soil geochemical anomaly in the area has a good indicative effect on reprospecting and is an important prospecting indicator.The prospecting effect in the exploration area has been greatly improved through the effective combination of geological investigation and soil geochemical survey.
1∶10000 geochemical surveysoil geochemistryore prospecting and predictionCaogentai area
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