| TangJia Zn-pb deposition located in the interjection of the southwest of Zn-Pbmetallogenic and the east of Kangdian axi, there have superior mineralize geologiccondition. This dissertation selects HanYuan TangJialead-zinc deposit as study,through great quantity of particular outdoors geologic work, making clearly for thespace distribution relationship of ore body in mining area﹑stratigraphic﹑lithologiccharacter﹑tectonic and Igneous rock; And making formal examination betweenpolished section and thin section in the room, comprehend in primary component ofmineral and the characteristics of texture structure; making analytic text of traceelement and rare element for ore and wall rock, fluid inclusion and measurementworking for fluid inclusion, making close discussion for geological eharaete of fieldbed and origin, this dissertation mainly acquire some recognition as followed:1The understanding of the distribution condition of stratigraphic and rock mass.The bare stratigraphic is mainly upper Cinisthana series of Guanyingya Formation（Zbg）、lower Cambrian series of Qiongzhusi Formation（∈1q）and Quaternary（Q），the attitude is smoothly, angle of depression is15—20°, Cinisthana series ofDenyingzu Formation dolomites is the most widely distribution, QiongzhusiFormation only emergence from the southeast corner of mining area.The emergenceof rock mass is moyite in the stock Jinning and Chengjiang Period, their area isfiner,only distribution in the core of JiangJiagou anticline on mining area.2Confirmed ore-controlling strata and lithologic character. The mineral ore ofHanYuan TangJialead-zinc deposit occurrence in dolomites, In more specific terms,mainly occurrence in sparry Botryoid dolomite、breccia dolomite、dololaminite。3Definition the mineral ore form. The mineral ore forms of HanYuanTangJialead-zinc deposit mainly have two kinds,one is occurrence inⅠore body inF1fault;the other one is in the slip surface of dolomites,or the banding from brokenbelt﹑stratoid﹑vein ore, Ⅱore body as example. Then, high grade ore mainlyoccurrence inⅠore body.4Confirm the structural ore control. The ore body in mining area mainlycontrolled by fault, it present on ore body not only occurrence in broken belt of fault,but also in some relation about theslip surface of tectonic stress. The fault notonly is a structural ore control,but also is a host structure and ore-passingstructure.Then, the fault have greatly influence for ore body in the postoreperiod,these fault caused folding and thickening or transposition and attenuation,evencaused missed of mineral ore,shaped into barren scuttle.5Clarifies of the composition and structure of the main structure of the ore. Tanglead-zinc ore bed composition is relatively simple, divided into ore mineral andgangue minerals, ore minerals are sphalerite, galena and pyrite; gangue minerals aremainly dolomite, calcite, quartz, gypsum and a small amount of clay minerals. Oreconstructed to brecciated, layered, massive, disseminated mainly; structure containingstructure, explain the residual structure, skeletal structure.6Divided into the mineralization times. Tang lead-zinc deposit in accordancewith the typical mineral characteristics, can be divided into three metallogenic period,five mineralization stages were deposited-diagenetic quartz-sulphides andsupergene period of.7To determine the composition of ore-forming fluid, uniform temperature,salinity and density. Fluid inclusions determined by the temperature of the depositmineralization obtained about167℃, salinity of about14%, a density of1.01g/cm3,fluid composed mainly of H2O, SO2, SO42-, belongs to a low temperature, the saltdegree of mineralization fluids.8Through the rock and trace minerals, rare earth elements and isotopic analysis,the deposit required for the formation of ore-forming fluids are mainly oriented to themeteoric geothermal brine, the main source of heat for the Permian basalt magmaeruption brings the heat. Mineralization required mainly from the formation ofelemental sulfur, lead, mainly from its ancient rock underlying system, metallogenicage of about300Ma9Determine the causes of the deposit. With the comparison of geological andgeochemical characteristics of the deposit and world of classic MVT type deposits,the deposit is MVT-type deposits in the genesis, geological research and explorationwork in the region provide some help. |
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