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 Os value of 0.68±0.24 and a corresponding γOs value of 442±91. I remember a magnificent kingdom, in a saltwater fish tank I had once and never had again. I see the silver Morning Star again, now in golden armor.
The establishment of the K-Ar and U-Pb dating techniques at these institutions were initiated and led by Profs. At the time, education of isotope geochronology and geochemistry was spearheaded by the Department of Geochemistry at the University of Science and Technology of China. This article highlights some of the major geochronological achievements of the past decades, with special focus on China's Precambrian geology, the improved understanding of age relationships in the Mesozoic Igneous Province of eastern China, and new developments in the dating of hydrothermal ore deposits. Keywords: Geochronology, Precambrian continental evolution, Mesozoic Igneous Province, hydrothermal ore deposits, China. 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.