Fluid Inclusion Geochemistry of Bashierxi Tungsten-Tin Deposit in Qimantag Area, Xinjiang
详细信息
- 责任者：Feng Chengyou (Key Laboratory of Metallogeny and Mineral Assessment ; MLR ; Institute of Mineral Resources ; CAGS ; Beijing 100037 ; China) ; Yu Miao
- 刊名：Mineral Deposits
- 出版年：2013
- 卷期：32(1)
- 关键词：钨矿 ; tungsten ores ; 锡矿 ; tin ores ; 岩石地球化学 ; lithogeochemistry ; 新疆 ; Xinjiang
- 页码：p.20-36
- 图表：illus., 3 tables, 50 refs.
- 分类号：1001
- issnNo：ISSN0258-7106
- isbnNo：CN11-1965/P
摘要
The Baiganhu W-Sn orefield consists of Kekekaerde,Baiganhu,Bashierxi and Aware deposits.Of these deposits,the Bashierxi W-Sn deposit is under exploration.Fluid inclusion microthermometry indicates that the ore-forming fluid of the Bashierxi W-Sn deposit is of the H2O-CO2-NaCl system.The fluid inclusions in hydrothermal quartz veins have 3 types:rich CO2-bearing inclusions,aqueous inclusions and rare hypersaline inclusions.The ore-forming fluid is characterized by a wide homogenization temperature range,varying from 260℃ to 440℃ and concentrated between 300℃ and 380℃,low salinity (generally varying in the range of 4%～12%),x(CO2)of 0.043%～0.595%,relative density of CO2 about 0.74～0.84 g/cm3,relative density of H2O 1.02～1.10 g/cm3 and fluid pressure 80～160 MPa.All these properties of fluid inclusions are similar to features of some tungsten deposits abroad.The evolution of fluid inclusion underwent three stages:pre-mineralization stage,mineralization stage and post-mineralization stage,with each stage reflecting different trends of evolution.In general,the homogenization temperature and salinity of fluid inclusion decreased from the pre-mineralization stage to the post-mineralization stage.An analysis of H-O isotope reveals that the hydrothermal fluid was mainly of magmatic hydrothermal fluid at the W-Sn mineralization stage,mixed with meteoric water at the sulfide mineralization stage.According to the relationship between the properties of inclusions,the pressure of inclusions is positively correlated with the homogenization temperature,and the vapor ratio has a significant impact on the x(CO2).