Pb-zn District, Western Yunnan Paul Pecan Ping F <sub> 1 </ Sub> Fault Structure Deformation And Mineralization Parse

Hetaoping Pb-Zn deposit, Baoshan western Yunnan is located northeast pitching side of hetaoping double plunging anticline, which is intersection baoshan-shidian double plunging anticline of north baoshan-zhenkang massif and lancang river deeply structural-metamorphic belt, in convergence zone of baoshan, Lanping-Simao, Changning-Menglian three micro-plate, tend to baoshan massif. F1 fault is major controlling structures, and No. V1 ore body and some other ore bodies distributes along the fault strike, and which is rich in varieties of structural deformation phenomena. In this thesis, based on the current basic structural geology features of F1 fault, Start to analyze microstructure deformation of tectonic and alteration minerals, fluid inclusions plane features, with minerals microscopic region and micro-structure analysis technology, analyze microstructure characteristics of fluid flow leaving in construction formation and development process, study systematic structural fluid characteristics and their interaction of each metallogenic, define time-space evolution sequence of F1 fault, Analyze occurrence, development and evolution process of F1 fault, investigate impact ore-controlling of fault structures on fluid migration. The results are asfollows:(1) Starting from the macro-structure on mechanical properties, Analyze structure type, size, mechanical properties,the results shows that F1 fault is a thrust fault and has had three phases of structure activities. It has experienced the right-lateral compresso-shearâ†'left-lateral shear-compressiveâ†'shear.(2) Macro-structural deformation, to the main penetrative foliation of wall rock,Non-penetrative sexual tension,shear joints and small folds formed by tectonic compression etc.(3)Microstructure deformation, including microscopic cracks, wavy extinction, mechanical twins, dynamic recrystallization, the stress shadow and rotation spots and other residue etc. A large number of fluid Inclusion plans in quartz are original record device of the migration of ore fluid composition changes during the stress and details. Microscopic structure features reflect that faults occurred under the conditions of the ductile-brittle deformation. The principal compressive stress direction of Conjugate joints, micro cracks and veins, and the FIP occurrence is consistent with the macro-structure, Nearly north-south and east-west direction. The stress difference is 38.1-56.5 Mpa by estimation method of dynamic recrystallization quartz, this value reflect medium intensity of tectonic deformation. Calculate by thermometer fractal of dynamic recrystallization quartz, deformation temperature is lower greenschist facies (300℃-500℃).Quartz throughout the mineralization process, inclusions in quartz are mostly pure liquid and gas-liquid two-phase. inclusion temperature results in quartz,calcite of V1 ore body showed that hydrothermal mineralization has gone through Middle-high temperature(250-300℃) and middle-low temperature(100-230℃) hydrothermal mineralization. the former may correspond to hydrothermal skarn-sulphide mineralization stage, the latter corresponds to hydrothermal vein sulfide-carbonate mineralization stage.(4)At the macro and micro structural analysis based on, analyze pb-zn ore-forming mechanism of Hetaoping preliminarily, there have a close link F1 fault and the ore between.The fault system control that ore fluid generation, evolution, migration until mineralization. The early construction provided the main channel for fluid; Medium-term structural control the mineralization process, created physical and chemical conditions and critical stress mechanism for mineralization necessarily, provided the ideal place for the precipitation of mineral enrichment; Late shearing led to the superposition of mineralization. Fluid as the incentive of mineralization, played the important role for deformation, expansion cracks, mineral concentration and transportion.(5) Resolve to tectonic deformation of F1 ore-controlling fault in the mining structure-fluid mineralization system, on the one hand, understand the mechanical nature of the F1 fault zone and tectonic evolution helply fully, provide an important constraint for precise identification and remodeling process of mineralization and difficult to recognize hydrothermal vein-type metal deposits and region dynamic mechanism.