The Tayuan Pb-Zn-Cu deposit is located in the northern section of the Great Xing'an Range.In order to explore the ore-forming material sources and mineralization mechanism of the deposit,microthermometry and laser Raman spectroscopy of fluid inclusions hosted in the quartz which is closely associated with sulfides in the deposit,H-O isotopic composition analyses of the quartzs,and in-situ sulfur isotope analyses of sulfides by using the LA-MC-ICPMS have been conducted.The results show that TypeⅠ fluid inclusions have homogenization temperatures ranging from 232℃ to 340℃ and salinities ranging from 1.2％to 16.0％NaCleqv.Type Ⅱ fluid inclusions have homogenization temperatures varying from 355℃ to 418℃,and salinities varying from 2.6％to 11.6％NaCleqv.The laser Raman spectroscopy results show that the gas and liquid components in those two types of fluid inclusions are mainly H2O,with the bubble of some Type Ⅱ inclusions containing a small amount of CO2.The δ34S values of sulfides vary from+0.3‰ to+3.1 ‰.The δ18O和δD values of quartzs vary from+5.4‰ to+10.5 ‰ and from-97‰ to-102 ‰,respectively.Combined with the comprehensive study of geological and geochemical characteristics of the area,it is suggested that the Tayuan deposit is genetically related to the Yanshanian intrusive rocks.The metal-rich magmatic hydrothermal fluid,which was exsolved from the magma of Yanshanian intrusive rocks,migrated along the NE-NEE-and EW-trending bedded faults,had extensive metasomatic alteration with wallrocks,and mixed with meteoric water.These caused changes of physical and chemical conditions of the hydrothermal fluid,resulting in the precipitation of sulfides.
关键词
S-H-O同位素/流体包裹体/成矿机制/塔源/大兴安岭
Key words
S-H-O isotopes/fluid inclusion/ore genesis/Tayuan/Greater Xing'an Range
维普
万方数据