The Tieluping silver deposit, located in the NE-trending faults within the metamorphic basement of the Xiong'er Mountain, is a typical altered fracture type deposit. Its ore-forming process includes three stages w...The Tieluping silver deposit, located in the NE-trending faults within the metamorphic basement of the Xiong'er Mountain, is a typical altered fracture type deposit. Its ore-forming process includes three stages with temperatures concentrated at 373℃, 223℃ and 165℃ respectively. With δD=90‰, δ13CCo2 =2.0‰ and δ18O=8.94‰, the early stage fluid was generated from reworking and metamorphism of the carbonate rich formation; the late one, with δD=-70‰, δ13CCo2 =-1.2‰, δ18O=-1,89‰, was meteoric hydrothermal solution; and the middle, δD=-109‰, δl3CCO2=0.1‰, δ18O=1.79‰, might be a hybrid mixed by reworking-metamorphic fluid and meteoric hydrothermal solution. Crystallized rapidly in the condition of fluid-boiling and fluid-mixing, the middle stage minerals have far more fluid inclusions with higher content of ions, higher ratios of H2O/CO2 and KN/MC. Consequently, they have much more ore elements such as gold compared with those of the early and late stages. It was the northward intracontinental subduction along the Machaoying fault during the Mesozoic collision between the South China and North China paleo-continents that intrigued large-scale fluidization and magmatism and- led to the appearance of more than 10 large and medium hydrothermal deposits, including the Tieluping silver deposit. The study on ore-forming fluidization of the Tieluping silver deposit proves the CPMF model.展开更多
文摘The Tieluping silver deposit, located in the NE-trending faults within the metamorphic basement of the Xiong'er Mountain, is a typical altered fracture type deposit. Its ore-forming process includes three stages with temperatures concentrated at 373℃, 223℃ and 165℃ respectively. With δD=90‰, δ13CCo2 =2.0‰ and δ18O=8.94‰, the early stage fluid was generated from reworking and metamorphism of the carbonate rich formation; the late one, with δD=-70‰, δ13CCo2 =-1.2‰, δ18O=-1,89‰, was meteoric hydrothermal solution; and the middle, δD=-109‰, δl3CCO2=0.1‰, δ18O=1.79‰, might be a hybrid mixed by reworking-metamorphic fluid and meteoric hydrothermal solution. Crystallized rapidly in the condition of fluid-boiling and fluid-mixing, the middle stage minerals have far more fluid inclusions with higher content of ions, higher ratios of H2O/CO2 and KN/MC. Consequently, they have much more ore elements such as gold compared with those of the early and late stages. It was the northward intracontinental subduction along the Machaoying fault during the Mesozoic collision between the South China and North China paleo-continents that intrigued large-scale fluidization and magmatism and- led to the appearance of more than 10 large and medium hydrothermal deposits, including the Tieluping silver deposit. The study on ore-forming fluidization of the Tieluping silver deposit proves the CPMF model.
