摘要
栖霞金矿床是胶东地区产在变质岩中的石英脉型金矿床较典型的代表。该矿床属中低温热液矿床，成矿流体的盐度较低。气相成分以Ｈ２Ｏ、ＣＯ２为主；液相成分中Ｎａ＋、Ｃａ２＋和Ｃｌ－的含量较高，相对贫Ｋ＋和Ｆ－，流体的成分与大气降水热液的相类似。成矿流体的Ｈ、Ｏ同位素值则很好地反映了大气降水在不同温度和不同Ｗ／Ｒ值条件下与胶东群变质岩交换后的分布特征。
The Qixia gold deposit is one of the important quartz-vein types hosted in metamorphic rocks in the east of Shandong, China. The temperature of its major mineralization episode is between 180℃ and 310℃. The salinity of the ore-forming fluid is 4.2% to 7.9%, with H2O and CO2 as dominant gas constituents. The fluid is rich in Na+, Ca2+ and C1-, but relatively impoverished in K+ and F-, characterized by either Ca2+> Na+> K+(in five samples) or Na+ > Ca2+ > K+(in two samples), and similar to that of the ore-forming fluid derived from meteoric water. Hydrogen and oxygen isotopes in the ore-forming fluid are highly variable with 18OH2O ranging between -3.69‰ and 4.5‰ and DH2O between -56‰ and -92‰ These isotopic values had fully reflected the distributive features of meteoric water exchanging with metamorphic rocks of Jiaodong Group in different temperatures and W / R ratios.
出处
《地球化学》
CAS
CSCD
北大核心
1996年第6期568-574,共7页
Geochimica
基金
国家自然科学基金
关键词
金矿床
成矿流体
地球化学
metamorphic rocks
Jiaodong Group
quartz-vein type gold deposit
fluid inclusion
hydrogen and oxygen isotope
