1.School of Energy Resources, China University of Geosciences, Beijing 100083, China;

 In order to quantitatively analyze the chronological order and characteristics of tectonic uplift since Meso ??Cenozoic in the northeastern part of Qinghai ??Tibet Plateau, the authors carried out fission track dating test and analysis for apatite and zircon. The results reveal that the apatite fission track ages in the study area range from (66 ± 9) Ma to (4.3 ± 1) Ma, and the zircon fission track ages range from (187 ± 11) Ma to (69 ± 4) Ma. Be? sides, the fission track ages in the northeast and east are relatively old. The tectonic uplift in the northwestern mar? gin of the study area was relatively early (200??160 Ma), while the tectonic uplift in the southeastern part was rela? tively late (140??30 Ma), and the tectonic uplift in the western part (including southwest) was the latest (90??10Ma). The overall tectonic uplift occurred after Neogene. The cooling and denudation rates of rocks are high in the west side of Guangyuan ??Jiangyou area, higher in the south side of Hongyuan ??Wenxian area, and highest near Lix? ian (23.26 ℃ / Ma and 0.78 mm / a, respectively) and this zonal variability is mainly governed by multiple regional large fracture zones.