Geological Features And Their Genetic Of Lianbaling Pb-Zn Deposit In The North Of Taihangshan

In geotectonic position, LianbaLing Pb-Zn deposit belongs to the northern end of theTaihang Mountains, the eastern part of north China craton (yan liao block) and the ordosmassif central orogenic belt,and originate in the deep fault belt of secondary parallel faultzone of Wulonggou-Shanghuangqi. On the basis of researching metallogenic geologicalbackground and geological features of LianbaLing Pb-Zn deposit,This article was Studied andsummarized predecessors’ research results,and researched mineralography, surrounding rockand ore controlling structure. Using the method of ore deposit geochemical testing, Includingthe main content, trace and rare earth element research, sulfur, lead isotope, inclusions anddiagenetic mineralization age research, This article was discussed the source of ore-formingmaterials,established a metallogenic model and summarized the ore-prospecting direction.This article has made the following main achievements and understanding:1. Overall,alteration of surrounding rock is weak;The Ore bodies occurrence in dolomiteof wumishan formation, sinian system and show lenticular,beaded, cystic,and nodular; Themain ore structure are massive and disseminated structures; Half automorphic and since theshape of granular structure is main sulfide minerals; Metal minerals are mainly sphalerite,galena, pyrite, chalcopyrite, arsenopyrite and orpiment iron ore etc; Secondary of limonite,malachite, copper, lead, vanadium blue, etc; The gangue minerals are mainly quartz, calcite,dolomite, barite, talc and chlorite;2. Fault, joint and other phenomena is developed very much in the study area.The mainguide rock, ore-controlling structure is deep fault of Wulonggou ditch, NNE direction. Nearlyerect of NNE and SN directions normal fault, reverse fault translation translation directlycontrols the distribution of the vein, NNE fracture zone and nearly north-south extensionjoints provides the convenience for facilitating the formation of Pb-Zn orebody.3. By observing the fluid inclusion petrography features, the temperature,pressure,andsalinity of fluidetc was made clear. Gas-liquid two phase inclusions are the main type of fluidinclusions, Gas liquid ratio between8~22%, uniform temperature is between230.1-416.5,the average of321.5; the range of salinity is10.02~24.48wt%, with the average of13.33~17.96wt%, It belongs to medium fluid salinity; Metallogenic pressure is38.17~51.31MPa,high pressure; Overall average metallogenic depth is4.69km, belongs to shallow strata.4. The diagenetic mineralization age is determined. Through the fine grain granite LA-ICP-MS zircon U-Pb age testing, we found that: Most of the zircon showed rhythm band of a typical magmatic zircon and crystal the length-width ratio of change in3:1~3.5:1, It showthat they belong to the magmatic origin; The age of deposit metallogenic is126±10Ma, Thisshows that It similar to the age of formation of Wanganzhen rock (123~129Ma) Or a littlelater than Wanganzhen complex rock mass.5. Discusses the ore-forming material sources. Sulfur isotope research of Sulfide inLianbaLing Pb-Zn deposit shows that sulfur mainly comes from deep source (or magma).composition of sulfur isotopic has smaller scale, The value range of δ34S is-2.7‰～6.9‰,theaverage of1.1‰, mainly for the-1‰~3‰; The ratios range of Lead isotope in the sulfide ofgalena is small,It has the characteristics of normal lead isotope, The lead mainly comes fromthe upper mantle-lower crust, Lead is mainly crust-mantle mixing.6. Determine the ore types, metallogenic model is established. On the basis ofresearching geological features of LianbaLing Pb-Zn deposit,fluid inclusions of alterationmineral, ore mineral S-Pb isotope and a large number of test data,I think LianbaLing Pb-Zndeposit formed in the high temperature epithermal vein type Pb-Zn deposit,related to lateYanshan, And the metallogenic model is established, the ore-prospecting direction issummarized.