Abstract:Niujiaxiaohe gold deposit is a typical representative of the fractured altered rock type gold deposit in Yishu fault belt. Through study on petrological characteristics of ores and country rocks, and geochemical characteristics of main and trace elements, it is found that metallogenic elements with high metallogenic temperature, such as Fe,Co and Ni enriched in NJXH1 sample; while metallogenic elements with low temperature enriched in NJXH2 sample. The variable coefficient of Yishui group is high, and oreforming elements distribute unevenly. It indicates that it is the main source bed of Niujiaxiaohe gold deposit. The REE distribution curve is rare earth element enrichment type. The characteristics of REE distribution from the ore of NJXH2 are similar to these from Yishui group. It indicates that they may be from the same source. The characteristics of Y/Ho in the ore shows that the oreforming fluids may come from metamorphic hydrotherm. Through summary and analysis, Niujiaxiaohe gold deposit may experience two stages of mineralization, and there is a significant difference in mineralization temperature. The main source of metallogenic minerals may come from granites in Yishui group and Yanshan period. The oreforming fluid is weak reduction and metamorphic hydrotherm may participate in mineralization.
