METALLOGENIC CHARACTERISTICS AND ORE-FORMING MODEL OF THE QINGLONGGOU GOLD DEPOSIT IN WESTERN LIAONING PROVINCE

The Qinglonggou gold deposit, located in the transitional belt between Shanhaiguan uplift and Western Liaoning depression in the Yanliao subsidence zone on the northern margin of North China platform, occurring in Mesoproterozoic carbonate rocks, is a representative of the same type in Western Liaoning Province. On the basis of field investigation and laboratory analysis for the source bed, mineralization temperature, alteration features and storage conditions of gold deposit, it is concluded that the deposit belongs to epi-mesothermal type. The ore-forming fluid is the mixture of magmatic water and groundwater. The gold is derived from mainly the carbonate rock of Wumishan Formation. Affected by multiple stages of tectonic activities, the gold experienced a number of extraction and enrichment. The occurrences of orebodies are strictly controlled by the interlayer breccia zones and tectonic fracture zones, showing the characteristics of dual controls by stratigraphy and structure.