A Study On Structure-Alkaline-Rich Porphyry-Metallogeny Of Beiya Gold Deposit Of Western Yunnan

Beiya gold deposit of western Yunnan lies in the center of the three landmasses: Dege-Zhongdian landmass, BaYankela-Yangzi landmass and Changdu-Simao landmass. For its special geological background, this gold deposit becomes a typical and representative hydrothermal gold polymetallic deposit in the Jinsha River - Ailao Mountain Alkaline-rich porphyry,gold polymetallic mineralization belt. So it is important to make a systematic study of the relationships among the structures, the magma and the gold mineralization in space and time.On the base of former research,and comprehensive information such as field data, geophysical and geochemical prospecting, remote sensing from geological investigations, the writer studys the conditions of mineralization, the geological background of mineralization, the characteristic of gold mine deposit, the structures of rock and mine, and mineralization series and ore-forming.Through the study of mechanical property the structure distortion characteristic, the distortion time of mining area structure, get the conclusion of relationship between controlling-structure and ore-forming and ore deposit distribution rule.The analysis of the rich alkaline porphyry type, the mineralization type, ore deposit spatial distribution and the relations between porphyry body and the structure were studied. The stage of Himalaya structure-magma and the mineralization stage have been divided.Carry on the discussion on the golden ore deposit originThe study of ore-forming background, the mineralization conditions, the typical ore ore bodies of Beiya deposit indicated that a series of Au, Ag, Cu, Pb, Zn, W, Mo deposit occurred in the Triassic Period's sedimentary rock . The ore deposits have the similar mineralization condition, geological feature and the structure-controlling the ore rule.They belong to the Himalaya rich-alkali porphyry hydrothermal deposit. There are a identical structure rich-alkai mineralization evolution series.The study of the structure of controlling-rock and controlling-ore and the remote sensing geology indicated that north-south structure is the most important. A series of rock magma, the mineralization activity of the deposit area are strictly limited in this group of . The near north-south crushed zone controlled the mineralization ,the ore body scale and the output shape change and caused the ore body to pinch-out and branch. The gold ore body occurred in the structure transition parts and structure crossing parts.Research on the structure ,the rock and the deposit origin indicated that the time, the space and the origin of the deposit all has close relationship with the Himalaya Alkaline-rich porphyry.The ore-forming materils origined from the crust and mantle.In the Himalaya stage, there are multi-stage structure-magma and the mineralization These magma and the mineralization activity are controlled by the near north-south direction structure, thus resulted in the corresponding structure-magma-mineralization zone. The superimposition of multi-stage and the different type mineralization activity resulted in the polymetallic ore deposit. The gold mineralization mainly occurs in the later period of magmatic acticity.According to the rule of structure-controlling, the model of the structure-magma mineralization, geophysical and geochemical prospecting information and the landmark of deposit,ore-forming forecast is made and the direction of seeking deposit in Beiya gold mine area and surroundings are found out.