| The Dagayinwendouer Zn-Cu deposit is located in the central Inner Mongolia ofgeosynclinal folded system (Ⅱ), northeastern part of middle mass (Ⅱ3) betweenAiligemiao and Xilinhaote. We discovered that general survey is underway in the area fromour per-survey work. Magmatic activity is intensity in the area, and magmatic intusionpresented from the Paleozoic to Mesozoic. The plutonic, mesogene and hypabyssalintrusive rocks are well distributed, and lithology are mainly intermediate,intermediate-acid and acid rock. Regional structure is mainly NE-trending anticlinorium,and core is the Middle Permian Dashizhai group (P2d) and two limbs of the fold isunconformably overlain by the Upper Jurassic strata. The core and two limbs for the folddeveloped NE-, NW-and EW-trending fault, and the Permian and Cretaceous rock bodies ishosted along the fault. The NW-trending fault is mainly developed in two limbs of the fold,which transformed the strata and controlled distribution and attitude of intrusive rock andvolcanic rock in the late period. The intersection of NW-, NE-and EW-trending faultalways disappear dense area of mineralization. The study area contains AS-17comprehensive anomaly from1：50000regional geology and mineral resources survey.There are3mineralized zone were discovered in the area, including No. ⅠCumineralized zone, No. Ⅱ Zn mineralized zone and No. Ⅲ Zn-Sn mineralized zone. The Cumineralized body is hosted in the No. Ⅰ Cu mineralized zone and accompanied with Ag.According to drilling, we delineated3layers of industrial orebody and low grade orebody.The orebodies are hosted by pyritization fluorite-bearing sillimanite alteration zone fromhigh silicification tuff with SE-trending strike and dip about47°. The wall alteration mainlycontains ferritization, Iron manganese mineralization and silicification. Alkali-feldspar granite presented in the mineralized zone and fine to medium grain mimoporphyritic granitein the deep hanging wall side and footwall. The wall alteration is mainly silicification, withminor potassic alteration. Low grade Zn orebodies presented in the No. Ⅱ Zn mineralizedzone, which is hosted by pyritization tuff with4.23-4.57m in width,100m in length,NNE-trending strike, dip of65-70°and grade of Zn is0.76%. The wall alteration mianlycontains pyritization and Iron manganese mineralization. The No. Ⅲ Zn-Sn mineralizedzone delineated5layers of industrial orebody,4layers of low grade of Zn and1layer of Snindustrial orebody. Zn orebodies are hosted by fluoritization, chloritization alterated zonewithin felsic cataclasite, and protolith is granodiorite. Sn orebodies are hosted bypyritization, epidotization alterated zone within porphyry diorite vein, and dip towards SEE,dip of75°, average grade of Zn and Sn are1.66%and0.26%, respectively. The hangingwall side and footwall for orebody is not obvious. The wall alteration mainly containsepidotization, slight silicification, and carbonatization and ferritization appeared withinfissure.Preliminary research established geology-geophysics-geochemical prospecting modelfor the Dagayinwendouer copper polymetallic deposit, which mainly showed that structuredeveloped position within granite, residual body within tuff-comprehensive anomaly ofmain ore-forming elements-higher polarizability-high magnetism-low electrical resistivity.We have evaluated propecting perspective for the study area, results indicate that hugeof orebody thickness, space for enlarge scale of orebody along stike and dip to the No.ⅠCumineralized zone and No. Ⅱ Sn-Zn mineralized zone. In addition, according to regionalore-forming geological conditions, comprehensive analysis of geological characteristics,and geophysical and geochemical data, we considered that ore-forming geologicalconditions for the study area is beneficial, and possess better prospecting potential, andthere is hopeful prospect that enlarge disconered scale of orebody and new discoveredorebody, and seek certain quantity of Cu, Zn resource. |
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