Analysis Of Ore-controlling Structure Deposit And 3D Modeling Of Jiaojia Gold

The NE-NNE Jiaojia gold ore belt is an important metallogenic belt in the northwestern Jiaojia gold ore concentration area,and the Jiaojia gold ore deposit is an extra-large gold deposit in the middle of the Jiaojia gold ore belt.The ore-controlling structure in the deposit is superimposed in multiple phases,and the mineralization styles are diverse.The altered rock type,vein disseminated type and quartz vein type mineralization closely coexist and have great deep mineralization potential.It is ideal for ore-controlling structure analysis and three-dimensional modeling area.The thesis focuses on the scientific problem of the structural control mechanism of the diversity of gold mineralization,determines the temporal and spatial structure of the fault zone and the three-dimensional geometry of the ore body,constructs a three-dimensional model of the deposit,and discusses the structure-fluid coupling mineralization.Obtain the following main knowledge:(1)Through the development of the mapping of the tunnel structure perpendicular to the fault zone,the structural phenomena such as ore-controlling faults,joints and scratches developed in the Jiaojia gold deposit were observed and measured in detail,and the temporal and spatial structure of the fault zone was ascertained.The Jiaojia fault is the first-level ore-controlling structure,which controls the output of the No.I altered rock type ore body;the secondary faults and dense joints developed in the footwall fracture zone are the second-level ore-controlling structures,which respectively control the No.? vein shape.The production of sericite type ore bodies and No.? quartz sulfide vein type ore bodies;the Jiaojia fault zone before the mineralization is a right-travel compression-shear tectonic activity,the mineralization period is a right-travel compression-shear structure activity,and the mineralization period is The left row compression-shear structure is active.(2)Through the measurement and calculation of the long axis(U),the secondary long axis(V)and the short axis(W)of the ore body in the Jiaojia Gold Deposit,the geometric characteristics of the ore body were ascertained.The average W value of No.I ore body is 4.78,and the average W value of No.III ore body is 3.45,indicating that the rock fragmentation degree near the main fault is higher;the average U/V values of No.I and No.III ore bodies are 4.29 and 3.7,respectively,indicating that No.1 ore body When the ore body is formed,the ore-forming fluid tends to flow in the pipeline,and when the ore body No.III is formed,the ore-forming fluid tends to seep;the ore body geometric shape parameter j value is greater than 1,and most of them are 0?1,indicating that the ore body has many shapes.It is oblate.(3)A three-dimensional geological model of the ore deposit was constructed using GOCAD,and the ore-controlling law,ore body shape and grade change law of the Jiaojia fault were ascertained.The direction of the fracture surface changes,in sequence 63°-41°-54°-78°-0°,the three lines of intersection lie northwest,and the lateral angles are 58°,62° and 70°,and one line of intersection southwest the lateral fall,the lateral fall angle is 82°,and the azimuths of the four intersection lines respectively control the lateral fall of the ore body;the ore bodies are mostly flat and lenticular.The ore body No.I tends to be stepped up,and the ore body No.III has an echelon on the strike.The characteristics of morphological distribution;both the periphery and the deep part of the deposit have great metallogenic potential.(4)The change of gold grade in the Jiaojia gold deposit is consistent with the fault;the fault controls the type of mineralization.The area near the main fault is of altered rock type,which is dominated by metasomatism,and the quartz vein type far away from the main fault is dominated by filling.Structural deformation controls rock fragmentation and fluid migration,thereby controlling the shape and spatial distribution of ore bodies.