The Au-existence State And REE Geochemistry Of Zhushanchong Gold Deposit

The Zhu Shanchong gold deposit, whose geotectonic position locate in the west of Jiangnan old continent, the north of Jinping-Rongjiang anamorphic area, lies in Tianzhu country in Eastern GuiZhou.The strata, where gold deposit is occurred, belong to the second section of the Qing Shuijiang System of upper Proterozoic. The faultage of this area is very excessive. There are five faults whose extent have been more than 900 metre and orientation are north-east. And at the same time, there are many other little size faults whose orientation are North-West. The developing rupture is the character of this gold areaBased on the work of the predecessors, in the paper, combining with the new geological phenomena of exploitation, the ore-body of deposit is divided into three types including bed vein zone type, retiary- work zone type and fracture-erosive zone type. Thereinto, the bed vein zone is that which growth in the space of terrane; Its size and shape are strictly controlled by the space of terrane. The retiary-work zone is made up of the little quartz vein. And the fracture-erosive zone is the complexity which appear in the fracture-erosive belt which include many quartz gobbets, wall rock gobbets and fault mud. The content of Au in the third zone type is more than the former two.Au mainly presence in the ore in the form of argentiferous-gold mineral. The result of suface scanning shows that there is no Au-isomorphism. The granularity of the gold minerals are generally smaller than 30 μ m. The configuration of them are graininess and erose. The gold minerals always lie in the cranny of arsenopyrite or the room between sulfide. Sometime they are enwrapped in the sulfide.Fluid inclusion in quartz minerals are gas- liquid type in general. The shape of them are mainly oblate or anomalistic. We can find some sole-liquid types occasionally. According to the temperature of the fluid inclusion which arrange 200 ℃ to 235 ℃, it considers that this deposit is a low-to-moderate temperature hydrothermal infilling quartz vein gold deposit.In the process of experimentation, we stumble on many weeny Rare earths minerals. They separate unevenly in the ore.The difference of the REE pattern between the alered rock , quartz vein and wall rock shows...