Geological Characteristics Of Tungsten - Tin Polymetallic Ore - Forming And Prediction Of External Prospecting In Shitanhe Area, Yunnan Province

Shiganghe region we studied lies between Lan Chang Jiang tectonic suture zone and Nujiang tectonic sutures in YunNan province. According to the analysis of field geological investigation, petrology and regional structure of Shiganghe region, this paper focus on the characteristics of metallgonenic geological setting in Shiganghe region and ore-bearing srtata and ore-controlling factors, such as magmatism and structure factor, through geophysical and geochemical methods.Based on the results, we summarize metallogenic regularity and metalogenic scale of tungsten-tin ore in Shiganghe region.Based on the metallogenic regularity of tungsten-tin deposit in Shiganghe region,1:10000 magnetic measurem data in ninety nine Tangbei and geochemistry abnormal area; we firstly found and optimize the mineralization target, which provide basic data for the orientation of tungstern-tin deposit,metallogenic regularity and ore-controlling factors, and also provide evidence for further exploration and development in Shiganghe region.1.Ore-controlling Factors:The structure of the mining area is complex. Zhi Ben mountain anticline whose axial direction is north-west and Shi Gang He recumbent fold are the primary ore-controlling structure. There are four main ore-controlling fault cluding Wuchashu, F1, F2, and F6 fault. The formation of tungsten-tin ore is closely related to the acid granite whose forming times is from Yan Shan period to Himalayan period.2.Ore Genesis:The species of ore are cassiterite-quartz type or tourmaline-quartz vein. Ore-body is controlled by structure and strong alteration. There are a serious of high temperature mineral with strong alteration. The search find multistage ore and corresponding mineral zoning ore-body is intimate with fine-granite on the space, which explain Shiganghe tungsten-tin belong to high temperature hydrothermal connecting derived magma forming in migmatization period.3.Metallogenic Regularity:We infer that the formation of Shiganghe ore-body are mainly controlled by remelting granite under the control of tectonism with migmatization. Alteration in the rock around the remelted magma were triggeded by lots of ore-forming hydrothermal solution during the process of the rising magma, at the same time volatiles in the remelting magma were produced because of pressure reducing as rising. Part of ore-forming hydrothermal solution were filled in the fracture as its rising along fracture formed in prophase tectonic movement during ∈ 3h1 and then formed vein minerals. Some of hydrothermal solution formed layered minerals along the bedding during C3h1.4. Perspective area circled:The data of soil geochemistry show that the element of Sn W Pb B and so on satisfy the metalizing background, which mainly spread over ∈3h and O3p.We delineate three prospecting ore are according to the abnormity of the single element and association elements.5.Preferably prospect:We inferred three prospecting ore area based on the information of geological and geochemical data:Ⅰ prospecting area of CU, Pb, Zn, W, Ⅱ prospecting area of W Sn,Ⅲ prospecting area of Cu Ni.