Zhalaxiageyong Pb-Zn deposit in Tuotuohe area is located in the northern part of the Sanjiang metallogenic belt in the Tethyan metallogenic domain. Some geochronology and geochemical studied on K-feldspar granite porphyry associated with lead-zinc mineralization. 238 By in-situ LA-ICP-MS zircon dating of the K-feldspar granite porphyry, obtained the 206 Pb/ U weighted average age of K-feldspar granite porphyry is 35.96 ± 0.61 Ma, and determined the geologic age of Pb-Zn mineralization is the Eocene Epoch. By the results of geochemical analysis, the characteristic of K-feldspar granite porphyry are high SiO2 , Al2O3 ,K2O and low TiO2 , Na2O; All samples fall into alkali granite area of alkaline series by diagram for TAS, All samples fall into alkali feldspar granite area by diagram for QAP; All samples fall into Potassium-rich series area by diagram for K2O-Na2O; All samples fall into Peraluminous area by index diagram for A/NK-A/CNK, and indicates the K-feldspar granite porphyry belongs to the Peraluminous potassic alkaline series granite. By the rare earth and trace elements geochemical characteristics, the K-feldspar granite porphyry are rich of LREE, LILE and partial HFSE, show obvious separate distribution pattern of LREE/HREE, and enrich relatively on Sr, K, Rb, Ba, Th, U elements with strongly incompatibility of large ions and La, Ce, Nd elements with high field strength. By the comprehensive study, the K-feldspar granite porphyry is formed in the continental-continental collision between the India plate and the Asian plate, and the tectonic environment of the post orogenic stage after the rapid uplift of the Qinghai Tibet Plateau.
Shi Chao Li Rongshe He Shiping Yu Pusheng Gu Pingyang Zhang Haidi Zhang Huishan. Study on mineralization age and its geological significance of Zhalaxiageyong Pb-Zn deposit by chronology and geochemistry of K-feldspar granite porphyry in Tuotuohe area[J]. Chinese Journal of Geology, 2017, 52(4): 1181-1194.