Probe into Geological Characteristics, Ore-Controlling Factors, and Genesis of Qingshan Gold Deposit in South Qinling

Qingshan gold deposit islocated in Zhen'an Basin of South Qinling.The ore bodies are located above the disconformity between Jiuliping Group and Jiehejie Group,and occuras veins,cystic pattern, lenticular form,and stratified form in the carbonaceous slate and carbonate.The structures of this region inherit the chess board structures formed in Devonian during the early-middle Yanshanian intra-continent oro geny,which control both the location of deposits and the distribution of ore bodies.The ores are divided into primary gold bearing pyrite-siderite type and gossan type.The main metallic mineral in the ore are siderite,pyrite,and limonite.The element association is Au-Ag-As-Sb-Ba,which is consistent to other deposits in the region.The metallogenic temperature ranges from 160℃ to 220℃ and the ore-forming fluid is under ground thermal brine.Therefore,it is the thermal brine that circularly extracts the mineral from the source bed to form this hot spring gold deposit.