TECTONIC DEVELOPMENT AND ORE-CONTROLING CHARACTERISTICS OF XIAOQINLING GOLD FIELD

Through analyzing the collected geological data of xiaoqinling gold field,the different levels of exploration engineering on typical ore deposits were studied systematically and the orecontrolling tectonic characteristics of the mine field were discussed. The research shows that under the control of the folds,most auriferous quartz veins are located at the axes or corners of YangzhaiyuDayueping-Jinluoban compound antiform. The development of ore-controlling faults inside the mine field can be divided into three stages: pre-minerogenic faults( the early ductile shear zone),early minerogenic faults( the middle brittle-ductile or ductile-brittle shear zone) and main metallogenic faults( the late brittle fault zone). Accordingly the main ore-controlling faults can be roughly divided into four groups: nearly EW,NE,NW and NS. The sizes of the ore bodies and ore deposits are directly determined by the structural belts and the scale of one single fault in the area,and because of the difference in the tectonic activity stages,tectonic deformation types and strength,the veins are in different occurrence state and the mineralization imbalance phenomenon is widespread.These research results can provide reference for carrying out metallogenetic prediction in large scale in this area.