中文摘要：

Zhenyuan 金沉积物是在 Ailaoshan 金带的最大的超级大金存款，但是它的精确矿化作用年龄仍然是缺乏。从 Zhenyuan 金存款的含金的黄铁矿的 Re-Os 同位素的年龄被使用高分辨率的诱导地联合的血浆团 spectrometry (HR-ICP-MS ) 决定。黄铁矿样品在 carius 试管被分解， O 被蒸馏分开， Re 被丙酮分别地提取。结果证明 Re-Os isochron 年龄是 229 灵楬瑦 ? 景琠敨儠湩桧楡吭扩瑥湡倠慬整畡 ? 敢睴敥 ? 桴 ? 慥汲 ? 楍 ' 覝?湡 ? 桴 ? 汐楥瑳 ' 覝?愠摮氠瑡 ? 敃潮潺捩朠潬慢 ? 潣汯湩吗？

英文摘要：

Zhenyuan gold deposit is the largest super large gold deposit in the Ailaoshan gold belt,but its precise mineralization age is still lack.Re-Os isotopic age of the auriferous pyrite from the Zhenyuan gold deposit was determined by using a high-resolution inductively coupled plasma mass spectrometry（HR-ICP-MS）.The pyrite samples were decomposed in carius tubes,Os was separated by distillation and Re was extracted by acetone,respectively.The results show that the Re-Os isochron age is 229±38 Ma（MSWD=2.0,confidence level is 95%）,with an initial 187 Os/188 Os value of 0.68±0.24 and a corresponding Os value of 442±91.The Re/Os ratios of the pyrite vary from 40.8 to 100.5.The data suggest that at least one important ore-forming event was occurred during Indosinian epoch,and the ore-forming materials probably derived from mixed sources of crustal and mantle,while the later dominated.The Ailaoshan composite orogen experienced complicated evolutional processes,including formation of Precambrian-Early Paleozoic basement,subduction and orogenesis of Late Paleozoic era,collisional orogenesis of Late Hercynian-Indosinain epoch,and extensional or striking orogenesis of Yanshainan-Cenozoic epoch.The polycycle tectonic evolution and magmatism in this area caused multi-stage and superposition metallization characteristics of the Zhenyuan gold deposit：the mineralization probably occur mainly during the Indosinian collisional orogeny,while the minor gold ores of altered granite-porphyry and altered lamprophyre may be formed in the late superposition metallization.