Research On The Metallogeny And Prediction Of Yu Shan Tungsten Mine In Jinta County, Gansu Province

Yushan tungsten deposit is located in the binding zone of tarim plate and kazakhstan plate, south of Heishan syncline, Heishan ductile-brittle shear belt, between the Laohushan-Shibanquan thrust nappe fault and the Hongjishan-Hongheishan nappe belt.Based on the analysis of the previous study, through field investigation, geological data collection, specimens and samples of rock and ore collecting, and with the application of modern petrology, geology of the deposit, geochemistry, mineralogy, isotope geology, the theories and methods of metallogenic prediction, the metallogenic regularity and metallogenic model of Yushan deposit are deeply studied.From the beginning of this thesis the author describes the regional geology, geology of mine area and geological characteristics of deposit, and based on the study of the characteristics of the strata, tectonics, magmatic rocks, trace elements, rare earth elements and stable isotope, the tectonic setting, sources of metallogenic materials, metallogenic regularity and regularity of elements accumulation are analyzed; and on the basis of the testing means of rock-mineral identification, test of rare earth elements, silicate analysis, it is considered that the magmatic rocks of Yushan mine area are homologous but not contemporaneous, the deposits of the mine area are contact metasomatic deposits, through the analysis of ore-controlling structures in this area, it is believed that the main ore-hosting structure is the NNE trending tensile fracture, the depression position of the tacting zone between the intrusion and wall rocks(marble) is the important ore-hosting position. The ore-controlling factors and metallogenic regularity are analyzed and summarized in this thesis, it is considered that the deep site and margin of this mine area are most favourable for prospecting. It is possible to find skarn tungsten, iron copper ore body in the depression position on which the occurrence of contact zone change, and find scheelite and fluorite ore body in NNW trending fracture of the carbonate in the external contact zone, based on which the new metallogenic model is established, and the most favourable prospecting areas are predicted. Through the research of ore-controlling factors and metallogenic regularity, it is considered that the west of mine area is the enrichment zone of tungsten, the central area is the iron enrichment zone, and the fluorite is enriched in the east, and the prospecting targets of each kind of ore are predicted.