| The lead-zinc polymetallic deposit of LuZiyuan of Western Yunnan, lied in the Southwest " Sanjiang " metallogenic belt in Baoshan and Zhenkang lead-zinc polymetallic belt mineralization zone, in recent years by the Yunnan Provincial Geological Prospecting Bureau of Investigation confirmed the large lead, zinc, iron and copper polymetallic deposits. The main ore body in vein, lenticular, layered, layered occur in the Upper Cambrian Shahe plant groups marble limestone and skarn, by the Zhenkang rehabilitation type anticlinal axis LuZiyuan secondary anticline core of development between the north-east fault and layer fracture zone control. By collecting a lot of information and field surface and underground engineering catalog and alteration - facies mapping, on the basis of analysis of the geological characteristics of the deposit on selected belt Ⅱ, as research subjects, rely on six pioneering works on ore body (mineralization), the altered rock composition, the combination of relationships, generate order, spatial distribution of systematic research, and made reference to the previous ore fluids materialized features to summarize build deposits mineralization and alteration zonation patterns.The main thesis of this study made the following understanding:(1) According to the characteristics of the observed mineral build order, interspersed with veins relations, structure and formation of spatial relations, the LuZiyuan Zinc Polymetallic Deposit mineralization into sedimentary diagenesis(the initial source of ore formation stage)、Skarn period、Hydrothermal mineralization period, supergene period. Hydrothermal alteration and mineralization within the mine action is more complex, more characteristic of multi- stage, mineralization occurs mainly in skarn and hydrothermal mineralization period, the specific can be divided into six stages: ①dry skarn stage; ②wet skarn stage;③ silicate-pyrite chalcopyrite phase;④quartz - pyrite - galena - sphalerite stage;⑤ quartz carbonate - galena stage;⑥ carbonate phase. Among them ②,③,④,⑤ four stages is the main stage lead-zinc polymetallic mineralization of copper and iron.(2) Observed under microscope sphalerite clearly has the characteristics of two different phases, this predecessors Luziyuan polymetallic deposit within the ore fluids inclusions petrography, temperature and composition of microscopic analysis are consistent, indicates that the hydrothermal mineralization indicate generally experienced low and high temperature in two stages.(3) Deposits has obvious horizontal and vertical mineralization and alteration zonation characteristics, the level of fan-shaped radiation belts irregular structure From the fan to the fan tail root, bottom-up, can be divided into garnet skarn belt, skarn-pyrite zone, skarn zone, carbonate-quartz-skarnization with carbonate-chlorite zone, Corresponding to a combination of magnetite ore minerals chalcopyrite-pyrite-sphalerite-galena combination, pyrite-chalcopyrite-sphalerite-galena combination, sphalerite-chalcopyrite-galena combination, sphalerite-galena combination, galena-sphalerite combinations.(4) According to mineralization and alteration mineral zonation characteristic combination of features, the establishment of the deposit mineralization and alteration zonation patterns. Luziyuan lead-zinc polymetallic deposits mineralization and alteration zonation patterns and Hetaoping lead-zinc deposits mineralization and alteration zonation patterns within the same block of comparison, the pattern in the Southwest "Sanjiang" metallogenic belt with widespread meaning, Also help to LuZiYuan deposit ore-forming fluid to deeply understand the characteristics and metallogenic regularity.(5) LuZiYuan lead-zinc polymetallic deposit is composed of lower Cambrian for ore formation, and provides the primary source, controlled by yanshan epoch of concealed granite emplacement, metallogenic material mainly comes from deep ore-forming fluid, part from Cambrian system containing ore formation, with multiple metallogenic stages and various sedimentary ore source-hydrothermal reformation type lead-zinc polymetallic deposit. Fracture development, formation lithology and fluid migration period stage, is a key factor of mineralized alteration zonation.(6) Conclusion LuZiYuan lead-zinc polymetallic deposit fu deposits, ore controlling structure and orebody mineralized alteration zoning pattern,combining previous do regional geophysical-geochemical anomaly and the known ore deposits, ore (coupling) point, framed the RenHe-MangBing lead-zinc polymetallic iron and ShuiToushan-WengKong-LuoJiazhai lead-zinc polymetallic ore prospecting target areas. |
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