FURTHER STUDY AND DETERMINATION OF THE METALLOGENIC EPOCH OF WULONGGOU GOLD DEPOSIT IN QINGHAI PROVINCE

The Wulonggou gold deposit, located in northern margin of the middle section of Eastern Kunlun Mountains in Qinghai Province, is the most prospective deposit in the Eastern Kunlun metallogenic belt. Based on collection of geologic data about the ore-forming tectonic setting, regional stratigraphy, lithology, structure and igneous rocks of Wulonggou gold deposit, with isotopic dating by alpha quartz activation(HAESRDQ) and Ar-Ar methods for gold ore and surrounding ductile shear zone, this paper analyzes the ages of ductile deformation, syntectonic alkaline magmatic activity, metallogenic material source and gold mineralization. By these data, with previous results, it is concluded that the ductile shearing deformation of Wulonggou area ended at about 240 Ma, namely Early-Middle Triassic or Early Indosinian epoch; the age of gold metallogenic material source area is between 235 Ma and 179 Ma, i.e., Late Indosinian-Early Yanshanian epoch; while the mineralization is dated at 91-21 Ma of Late Yanshanian to Early-Middle Himalayan epoch.