Metallogenic Conditions And Genesis Of The Dongjingcun Copper-gold Polymetallic Deposit In Siziwang Banner,Inner Mongolia

The copper and gold polymetallic deposit in dongjing village,siziwang banner,Inner Mongolia autonomous region is located at the junction of two tectonic units.The outcrop strata mainly include the Great Wall of proterozoic baiyin baolag formation,hugetu formation and the quaternary holocene.Based on the project of "pre-inspection of copper and gold polymetallic deposits in dongjing village,siziwang banner,Inner Mongolia autonomous region",the paper carried out field work and data collection in the research area,conducted a large number of rock ore tests,and analyzed the geological conditions,source of metallogenic materials and metallogenic mechanism of silver lead,zinc,copper and gold polymetallic deposits.It is found that the ore deposit is located in the rift zone between baiwoodland and the big rock buried deep fault,and the mineralization of the metallogenic area is concentrated in the gabbro body contact zone or the bayan obo group fault.The ore body occurs in the middle neoproterozoic bayan obo group strata,and the surrounding rocks are mainly limestone and SLATE.According to the comprehensive study,the silver-lead-zn-cu-au polymetallic deposit in the study area is a magmatic hydrothermal filling deposit,which is the product of the tectonic and magmatic activity in the Paleozoic hualixi period.According to the distribution features of mineralization zones,7 integrated anomalies based on geological,geophysical and geochemical characteristics,and 6 IP anomalies,two gold orebodies,numbered Au ? and Au ?,and two copper orebodies,numbered Cu ? and Cu ?,are located.The Au ? orebody dips 340° and its dip angle is 54°.Its apparent thickness is 1.88 meters,and the grade of gold varies from 0.34 g/t to 67.49 g/t.The average grades of this orebody for gold,sliver and copper stand at 31.77g/t,30.50g/t,and 0.26%,respectively.The Au ? orebody,with a apparent thickness of 1.2 meters,features average grade of 4.06g/t for gold and 2.78g/t for silver.The apparent thickness of Cu ? and Cu ? are5 meters and 2.8 meters.The grade of copper of Cu ? varies from 0.22% to 0.32%,while that of Cu ? varies from 0.12% to 0.33%.