| Shuangniupeng gold deposit is located in the Dadu river gold metallogenic belt,the tectonic location is located in the Yangtze paraplatform and Songpan Ganzi geosyncline fold system two ? level tectonic units of the joints.At the center of daofu-kangding trigeminal rift system,and the south-north anling river deep fracture,north west to the fresh water river deep fracture,north east to alum deep fracture and beichuan-yingxiu deep fracture four major fault lines crossed.It belongs to the gold deposit bed in the basement of the kangding complex and the covering surface,and belongs to the quartz vein gold deposit in the belt of the dadu river.In this paper,through summarizing predecessors' research results and geological information collection,and to carry out field geological survey in the study area,such as mountain pit drilling engineering technology,such as using experimental test means such as thin section observation,electron probe microscope.Main Shuangniupeng in kangding city gold deposit ore-forming geological background and geological features of ore deposit,geological characteristics of ore bodies,mineral fabric and composition and ore-controlling factors are studied,and under the premise of literature review to draw the following understanding:Through field geological survey to realize kangding Shuangniupeng zhongjin gold orebody mainly occurs in the jinning movement-chengjiang period in the quartz diorite rock mass,the lithology is mainly for the light grey-gray Angle of biotite quartz diorite,dark mineral of hornblende and biotite,much has happened chloritization and epidotization.Along the dadu river,the jin ningjiang period "kangding complex" is known as the jin ningjiang period.Combined with regional data analysis it is concluded that the east-west fracture(F16 fault)in the study area for the main ore-controlling structure,distributed in the middle,in the study area extends out of the study area;As well as the fault of the north east to the fault(F1 fault),it is the secondary controlling ore and the capacitance fault of north east and north west.By pit drilling engineering control,and the research area of orebody,a total of seven orebody Numbers for 1,2,3,4,5,6,7,formed a parallel distribution of vein ore bodies,local lenticular,strictly controlled by fracture.Through field observations mineralization distribution and wall rock alteration features,ore body and surrounding rock is blurred,both show the contact relation between the gradient type,see more silicification,pyritization,sericitization alteration,etc.Collect geological data and research Shuangniupeng ore deposit geological feature analysis of the ore-controlling factors concluded:(1)the tectonic background are favorable for gold metallogenic area,control the area the formation of gold deposit.The regional magmatic hydrothermal movement strong,frequent tectonic movement,such as fracture and fold,agglomeration,large,is not only the deep variety of substances,elements and heat release kinetic energy gathered a good location,and is an important area of gold enrichment of ore-forming elements such as special.(2)ore bodies are strictly controlled by fracture structure,including F16 fault as the main ore-controlling structure,is the main channel,the ore fluid migration for mineralization in its structural fracture zone,the broken degree of the rock not only determine the spatial distribution of ore bodies and the output of occurrence,but also to the mineralization and enrichment.Meanwhile gold body in tectonic fracture zone output form for vein,lenticular and irregular shape etc.,and are often of shrinkage,such as state branch composite output;(3)the magma activity provides the heat source for gold mineralization,ore formation of hydrothermal migration along the channel enrichment,evolution of magmatic emplacement,replacement of remelting,power differential is to control the important factor for the formation of gold mine;(4)the basement formation is mainly composed of migmatization plagioclase amphibolite,long flash oblique Angle of breccia(stripe)migmatite,long flash oblique Angle of mixed gneiss,dark clouds change such as rock,two long shallow grain composition,au abundance have been one of the basic mixed rock class average abundance value is much higher than the earth's crust,it is also one of gold metallogenic material source.Comprehensive analysis(5)in the study area,on the regional nappe thrust(F1)and the secondary fault fracture zone in footwall,have been found in more than ten,small ore deposits,mines,east to the north of the ore-controlling tectonic fracture is given priority to,time for north west;Nearly ore wall rock alteration are mainly pyritization,silicification and carbonatization,sericitization,greisenization,galena and chalcopyrite,etc.,and gold element geochemical anomaly intensity big,with three zones and strong focus on the heart of gold anomalies,is looking for gold mine area,especially with kangding complex genetic relationships of kangding dadu river gold mine,is one of important type of gold deposit in our country.Area is located in dadu river gold metallogenic belt,is one of the important type of gold deposit in China,is looking for related to ductile shear zone of tectonic altered rock type and quartz vein type gold deposits in the favorable areas. |
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