The Early Jurassic granite body in Qieqiong area of Tibet lies in the middle of Gangdise tectonic-magmatic belt. The main lithology is unequal granitic monzonite and granodiorite. The dating results of U-Pb from LA-ICP-MS zircon indicate that the emplacement ages of granite bodies in the study area are mainly 192.8±1.3 Ma～189.1±0.66 Ma, which belongs to the Early Jurassic. SiO2 = 65.58%～75.57%, K2O+Na2O = 7.00%～8.25%, aluminum saturation index A/CNK = 0.81～1.33. The fractionation of heavy and light rare earth elements is obvious, （La/Yb）N = 2.47～42.03, negative Eu anomaly, δEu = 0.27～0.72. Early Jurassic acid intrusive rocks showed strong enrichment of Rb, Th, U, La and Ce, relatively enrichment of Nd, Hf, Sm, Y, Yb and Lu, and relative deficit of K, Nb, Sr, P and Ti. According to the genetic type of rock mass and the evolution of regional tectonic environment, it is concluded that the granite in the study area was formed in the same collision environment. It is the product of shell source rock remelting.
Huang Zesen Zhang Kaijie Zhou Yang Huang Wen Han Yabiao Mo Xu. The chronology characteristics and tectonic significance of Early Jurassic granite in Qieqiong area in Tibet[J]. Chinese Journal of Geology, 2020, 55(2): 558-573.