Ore-controlling Structure And Prospecting Forcast Of Jinqingding Gold Deposit In Rushan, East Shandong Province

JinQingDing gold deposit is located in the middle of the Muping-Rushanore-formingbelt and the south of the NNE Jiangjunshi-Quhezhuang fracture tectonicbelt.The surrounding rock of the deposit is Kunyushan monzonitic granite，it is typicalquarz vein gold deposit and the Ⅱ is its main orebody. This paper mainly studies thedeposit ore-controlling structure, mineralization epochs, tectonic stress field, alteredrock characteristics and ore-forming fluid of the depositThrough research, we found the main ore-controlling structure methods are:1)shear joints ore-controlling;2) tracking joints ore-controlling;3) fork-shaped fissureore-controlling;4)"入" shape ore-controlling;5) conjugate joints ore-controlling.The ore bodies in space are en echelon distribution controlled by tracking joints.According to the age of diagenesis and mineralization and successively cuttingrelations between orebody and fracture,we divided the tectonic stress field ofJinqingding gold deposit into three period and six stage. Gneissosity of earlymineralization is due to the formation of extrusion, we speculate that the earlymineralization maximum principal compressive stress direction is NEE （50°⁸0°）.The maximum principal stress σ1of the mineralization of the first phase should bedirected163°¹90°, the maximum principal stress σ1of the mineralization of thesecond phase should be directed NE41°⁷8°, The Ⅱ orebody is like obliquecolumns in the plane and on the NE side prostration in space under the action of thesetwo phases. The compressive stress of the first phase of post-mineralization should beNE-SW to NEE-SWW, providing a intrusion space for the lamprophyre. Thecompressive stress of the second phase of post-mineralization should be NWW-SEE,developed F1, F2, F3, F4and other large NW^NNW left-lateral breaks and somesmall-scale NW^NNW faults. The compressive stress of the third phase ofpost-mineralization should be NEE-SWW, forming a phenomenon that NNEright-lateral faults dislocate NW and NNW faults.The results of whole-rock analysis of Jinqingding gold deposit show that the chemical composition of the ore body is very different from the k feldspathization,sericitization, silicification monzonitic granite and the differences are relevant withthe migration of chemical elements In the course of alteration. Homogenizationtemperature of fluid inclusions in quartz veins generally distributed in200℃²90℃, salinity is mainly distributed in5%to11%, pressure is mainly concentratedin190²70Mpa, belong to the low-temperature, low salinity fluid. The cation ofliquid phase composition of fluid inclusions is mainly composed of Na+and Ca2+,followed by K⁺and Mg²⁺; Anions are mainly SO42-and Cl-followed by the F-andNO3-。Inorganic gas composition are mainly H₂O CO₂, followed by H₂, N2, CO andCH4, Belonging to CO₂-H₂O-NaCl system.By studying the spatial distribution rule of the orebody and ectonic stress fieldcharacteristics combined with results of previous studies and drilling verification, wespeculate that the periphery and deep1300¹500m of Jinqingding gold depositexists considerable amount of resources.