Yimen Lion Rock Copper Deposit Geology And Geochemistry And Prediction Of Concealed Ore

On the summarying systematically of regionnal mineralize background,mineral deposit characteristics and goechemistry of mineral deposit, The paper uses the method and theory of field geodynamics and tectono-geochemistry to study the property of structural controlling mineralization,the allocation property of orebodies and the prognosis of concealed orebodies and obtains main achievements and innovations as follows:1,The Shizishan copper deposit locates in the northwest of reversed,plunging vertical Shizishan anticline.The ore-bearing stratums are Yingming formation,Luoxue formation and E'touchang formation of the Mid-Kunyang group. According to the discrepancy of ore-bearing stratum,the ore bodies of the Shizishan deposit are divided into four types:sandstone type orebody,dolomite type orebody and slate type orebody.The gabbro ore body is another new mineralize type discovered in the deep.2,By means of studying the fluid inclusion's lithology of quartz vein and the measurement of the homogenization temperature and salinity, the paper finds a new kind of high temperature and high salinity inclusion that states the deep-focus ore-forming fluid involved in metallogenesis. On the research of mineral deposits and other characteristics of geochemistry of mineral deposits, the paper thinks that the origin type of Shizishan copper deposit is sedimation-reformation-magma composition. So this paper raises the new opinion that the deposit may have superposition metallogenesis of deep-focus fluid.3,Based on the predecessors' research, the paper further sums up the ore-controlling structure patterns of this ore area:"anticline+fault" type and"ξ"type;and raises the new evolution mechanism of Shizishan fold structure and the rule of tertiary structure-controlling and ore body orientation.4,Through research on the tectono-geochemistry of 7,13 and 15 levels of the Shizishan deposit, the paper obtains different of association of elements: Cu-Mo-Ag-Bi are high temperature composite elements and Na2O-Zn-Ge-Ag-Sn-Pb are mid-lowe temperature composite elements of; CaO-MgO-Sr-Mn-(Cu) are the mineralize composite elements of sedimentation-diagenesis. The tectono-geochemistry abnormal of the Shizishan spreads along NE-SW and to be in line with the northeast strike of ore-controlling faults and the axial direction of the Shizishan fold. It reflects that the metallogenesis is controlled by structure; The tectono-geochemistry abnormal concentration center is situated in the ridge of Shizishan composite anticline and weakens from the northeast to the southwest,from Luoxue formation to Yingming formation,to indicate the migration direction of ore-forming fluid; The tectono-geochemistry abnormal concentration center is situated between No.3 prospecting line and No.8 prospecting line where is overlapped the main ore body and No.8 ribbon ore body almost. It implies that area in deep is the main target of conceaed orebody.5,The paper presents the zoning rule of mineralize elements and geochemical anomaly pattern:Cu-Mo-Bi-Co-Mn is the indicator element combination of ore body and Ag-Pb is the long range indicator element combination.This deposit has Zoning sequence of Mn-Ba-Ag-Zn-Cu-Pb-Co-Bi-Mo in axial direction from above to below.6,Based on the metallogenic law and orientation rule of ore body, the paper applies the geochemical exploration technology to prognosis the concealed orebody of the Shizishan copper deposit and obtains better prospecting effect after being verified by later project.