The Geochemistry And Genesis Of JiaPiGou Gold Deposit In JiLin Province

The Jiapigou gold deposit is located at the northeastern of NCC and it is also located at the southeast of Huifahe Fault. Huifahe Fault is one branch of the Tanlu Fault which is stretch to north. Therefore, the Jiapigou deposits were under the control of Huifahe Fault and Jiapigpou Fault. This dissertation get the first hand material by long term filed work and serious micro-observation. It also interpret primary halos model and deposit genesis through the study of Chronology, Geochemistry, Primary halos-Geochemistry and Stable isotope geochemistry.This dissertation main research interest is on the regional geological setting, regional structure setting, the geological feature and primary halos model of Jiapigou deposit, and the last research part is stable isotope. It is showed that there are lots of alteration types in Jiapigou deposit belt, and the main alteration type is potash feldspathization, siliconization, carbonatization and pyritization, and pyritization is closely related to the mineralization. Through statistical analysis, alteration belt can be conclude that with the temperature reducing, the alteration belt is siliconization-felstoneâ†'feldspathization beltâ†'sericie schistâ†'calcite. Through H-O isotope analysis, the ore-forming fluid of this area is mainly derived from the magmatic water, but because it is influenced by Jiapigou Fault, there is lots of atmospheric water permeate though Jiapigou Fault, so it is also offered metallogenic material. We also analysed the C, S, Pb isotope, all of these showed that the ore-forming fluid derived from the mantle.In China’s gold deposits, the axial zonation of primary halo is B-Bs-Hg-F-Sb-Baâ†'Pb-Ag-Au-Zn-Cuâ†'W-Bi-Mo-Mn-Ni-Cd-Co-V-Ti from top to bottom. Based on the field and laboratory investigation, the mineralization period of Jiapigou gold belt can be divided into four mineralization stages: I. Pyrite-quartz stage;â…¡. Gold-quartz-pyrite stage;â…¢. Gold-quartz-polymetallic sulfide stage;â…£. Quartz-carbonate stage. Theâ…¡andâ…¢stage are main mineralizational stage, however, stage I andâ…£are unrelated to industrial orebody. Based on the studies above, I did superimposed halos prediction and model diagram of different ore deposits.