岩石矿物学杂志2011，Vol.30Issue(4)：637-644,8.
内蒙古龙头山多金属硫化物矿床同生重晶石流体包裹体特征——海相热水沉积成因证据
Characteristics of fluid inclusions of barite in the Longtoushan polymetallic sulfide deposit, Inner Mongolia: evidence for submarine hydrothermal sedimentary origin
摘要
Abstract
The Longtoushan polymetallic sulfide deposit is located on the east slope of the middle-south Da Hing-gan Mountains and the north side of the Xar Moron River fault along the Hercynian geosyncline fold belt. Field geological survey shows that the ore deposit has two mineralization types, namely layered mineralization and cylinder mineralization. Attitudes, alterations and minerals of the two mineralizeation types show typical characteristics of submarine hydrothermal sedimentary deposition. A systematic study of fluid inclusion petrography and microthermometry was carried out for fluid inclusions in syndepositional barite from the ore deposit. The inclusions in the barite suggest rapid sedimentary characteristics during the hydrothermal sedimentary deposition. Except for secondary fluid inclusions, gas-pure and gas-rich inclusions related to the mineralization are very rare, with the majority being liquid-rich inclusions. Microtherrnometric analysis shows that the liquid-rich inclusions have homogenization temperature 101.4~279.9℃,freezing temperature-5.5 ~ - 0.3℃,salinity 0.5%～8.5%, and fluid density 0.75～0.97 g/cm3. Reflective features such as temperature, salinity and density of the ore fluids are consistent with features of the inclusions developed in submarine hydrothermal sedimentary sul-fides ore deposits. The results provide positive evidence for the viewpoint that the Longtoushan polymetallic sul-fide ore deposit is a marine hydrothermal sedimentation deposit.关键词
流体包裹体/热水沉积/重晶石/多金属硫化物矿床/龙头山Key words
fluid Inclusion/hydrothermal sedimentation/barite/polymetallic sulfide ore deposit/Longtoushan分类
天文与地球科学引用本文复制引用
孙兴国,李永兵..内蒙古龙头山多金属硫化物矿床同生重晶石流体包裹体特征——海相热水沉积成因证据[J].岩石矿物学杂志,2011,30(4):637-644,8.基金项目
中国科学院知识创新工程重要方向资助项目(XMXX280734) （XMXX280734）
