Research On Geology And Geochemical Characteristics Of The Huaniushan Pb-Zn Deposit In Gansu Province

The Huaniushan Pb-Zn deposit in Gansu Province is located in the southern of North Mt.metallogenic belt.The magmatic activity in the region is frequent and the intrusive rocks are widely distributed,of which the most late magmatic activity-Triassic granite is most closely related to mineralization.Through the field reconnaissance and rock identification of the Huaniushan Pb-Zn deposit,it is shown that Huaniushan Pb-Zn ore bodies are mainly deposited in marble limestone and phyllite and angular rock interface.At the same time,the position of orebody has spatial correlation with the Triassic intrusive rock.Metal minerals are mainly lead,sphalerite,pyrite,secondary minerals mainly female Huang,brass ore,etc.,where the state of the Ag is divided into two separate minerals and invisible Silver two forms of existence.In order to understand the relationship between Huaniushan granite and Huaniushan lead-zinc mine,the experimental results of Huaniushan granite show that the Huaiushan Rock is a high K-Ca alkaline granite,and the rock mass is formed in the Post-collision or post-orogenic tectonic environment,which is the later stage of the evolution of the orogeny,and the tectonic background is mainly extensional.It is composed of monzonitic granite-Syenite-Granite porphyry,with Type I and A transition granite,and belongs to high differentiation I-A type complex rock mass.According to the previous data,the Huaniushan rock mass should be invaded in237?227Ma.Through the study of stable isotope and Ree geochemistry,according to the comparative study of regional metallogenic regularity,ore-body output characteristics and rock-mineral geochemistry,it is concluded that the ore-forming materials of Huaniushan despoit are mainly from the Huaniushan Triassic granite,partly from the surrounding rocks of the ore-forming fluids,and the hydrothermal fluids are mainly magmatic hydrothermal fluids.The results suggest that the Huaniushan Pb-Zn deposit belongs to magmatic hydrothermal lead-zinc polymetallic deposits related to the Triassic intrusion events in the region.