| Naoyangping-Damogou zinc-fluorite deposit is located in the eastern of northernDabashan thrust fold belt. It is a typical hydrothermal deposit controlled by tectonic fracture.Based on the full collection of the results of previous data, relyingon”Naoyangping-Damogou zinc-fluorite mining ore field structure and the prospectingproject research of Pingli country in the shanxi Province”. Starting from small structure inthe mining area, separately from the regional tectonic evolution, tectonic deformation,tectonic sequence of basic characteristics of the deposit, the ore control characteristics toanalysis the effects which structure to the ore body, and summarizes the tectonic orecontrolling model. At last, draw the following conclusion:1. The fracture system can be divided into four groups which direct on E-W, NW-SE,NWW-SEE, NE-SW in Naoyangping-Damogou zinc-fluorite mining area. And the NW-SEfault is the most important ore control structure, the fracture of F1is secong grade oreleading structure and ore matching structure. The group of NW-SE fracture and interlayerfracture zones is ore hosting structure. Combined with regional tectonic evolution,determined the fracture of deformation evolution sequence in this mining area. The EWfracture group is produced in late Indosinian-early Yanshan period, and the NW-SE andNE-SW fracture group is produced in early Yanshan period. Then the dextral strike slippingmovement shear stress is conducive to the formation of hydrothermal fluid migration fillingmetallogenic transtensional dextral strike slip fault. And we confirm the strain ellipsoidduring the mineralization stage. And restoration of the principal compressive stress directionof ore-forming period is NNE(10～20°), Through the existing borehole data, wecomprehensive analysis the deep extention for main ore bearing fracture. The orecontrolling fault extending generally shallow, but it is often echelon distribution in deepplace. And the ore body is controlled by fracture is also echelon distribution.2. Sphalerite ore texture as its form-idiomorphic granular or massive texture, orestructures are mainly disseminated structure, block structure and brecciated structure, partialvisible vein structure. Texture of fluorite are euhedral to subhedral crystal texture andcataclastic texture, ore structure is mainly for the massive structure, followed by disseminated, brecciated, ring and net vein structure. Through observation for symbioticcombination of ore minerals, ore texture and structure and ore interspersed relation, we canconclusion that stage of mineralization of this area can be divided into5stages:(1)Hydrothermal stage pegmatite calcite stage;(2) Coarse grained fluorite-calcite and fluoritevein–quartz and fluorite vein stage;(3) Calcite sulfide–quartz sulfide (sphalerite) stage;(4) Calcite veinlets–fluorite veinlets stage;(5) The near surface oxidation leaching stage.3. The temperature, pressure and salinity characteristics of fluorite fluid inclusionshows that the fluorite homogenization temperature from289～340℃, it is belong tomesothermal ore deposit. The salinity range of0.53%～6.16%, ormation pressure is60.40～107.14MPa, the depth of mineralization of2.19～3.89km. Based the analysis oflithology, petrographic and geochemical testing for magmatite in mining area, we think theImplicit matrix pyroxenite and trachyte should be produced in the different stage ofcomagmatic evolution. And the study for rare earth elements, trace elements for trachyte,Silurian limestone and K1sphalerite, we think Sphalerite ore elements mainly come fromtrachyte.4. The zinc ore deposit and fluorite ore deposit is a typical hydrothermal depositcontrolled by tectonic fracture, and the metallogenic geological body is the Silurianformation argillaceous clastic rocks, limestone and deep source shallow trachyte rockintrusion or volcano eruption, the intraplate tectonic deformation in the lateIndosinian-Yanshan period produced EW and NW-SE fracture, and the ore hydrothermalmetasomate in this fracture, produced quartz-calcite-fluorite-sphalerite-veins. |
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