The Geological Characteristics And Metallogenic Of Dabaoshan Copper Polymetallic Deposits In Guangdong

North Guangdong Dabaoshan deposit is lie in the middle south edge of the Qinhang metallogenic belt,near by the Nanling tectonic belt.Dabaoshan deposit's geology condition is very complex.I do structural alteration mapping in the pit.The geologic boundaries and tectonic properties and alteration types were redefined,and samples were collected for microscopic lithofacies facies study.According to the Characteristic minerals of the sulphide deposits' analyzed by electron probe,to analysis the geochemical of the porphyry.There are some view of mine.1.To carry out the alteration pattern of the excavation area,to divide the alteration zone,to divide the molybdenum mineralization intensity zonation.The alteration of mineralization zonation and intensity indicates that the closer to the granite steep porphyry in the north,the stronger the silicification,the stronger the molybdenum mineralization,the stronger copper and sulfur lead and zinc mineralization,indicating that the silicification of molybdenum and molybdenum is associated with the Dabaoshan granodiorite porphyry.The alteration is ring-shaped distribution in the granodiorite porphyry Around,indicating that alteration and mineralization are related to the Dabaoshan granodiorite porphyry.The small increase in the degree of alteration of mineralization in the south suggests that there may be a hidden porphyry in the vicinity.2.The electron probe test of copper and copper ore bodies in the north is mainly based on the mineral standard of pyrite and pyrrhotite.The ore deposits are related to the multi-stage magmatic activity,and are compared with the Zijinshan copper and gold deposits.Similarity is high,suggesting that both deposits are associated with multi-stage volcanic activity related to hydrothermal deposits.By analyzing the degree of Fe element vacancy in pyrrhotite,the temperature of metallogenic is analyzed,and it is found that the pyrrhotite is more high-temperature hexagonal,and the pyrrhotite For the low temperature monoclinic system.3.magmatic rock geochemistry,through the analysis of the main trace elements,found in the mining area of the three porphyry belongs to the evolution of homologous evolution,while the Chuandu and Dabaoshan granodiorite porphyry is the different depth of the same rock,The tectonic movements move the two porphyry at different depths to the same horizontal position.4.In the Mesozoic extension of the Dabaoshan area,large-scale magmatic activity occurred in the Mesozoic extension of the Dabaoshan area,and the magma mixed with the crust and mantle merged into the shallow crust along the fault.The oreforming fluid is at the intersection of the structure,structure broken belt,and carbonate rocks and other favorable layer formation ore body.The type of deposit is porphyry-skarn type deposit.