Abstract: Based on our measurements of fission track ages of apatites (11343 Ma) and zircons (169103 Ma), U-Pb ages of zircons (215206 Ma) and K-Ar ages of biobites (186178 Ma) of granite samples, we performed apatite fission track thermal history modeling and track age spectra calculation (TASC) to obtain up-to-date histories of uplifting and cooling of the Qiangtang Central Uplift Belt (QCUB) since the Late Triassic. The QCUB experienced four major uplifting-cooling episodes, namely the Early Jurassic, Late JurassicEarly Cretaceous, Late Cretaceousearly Miocene and later Miocene. The four episodes correspond to the dynamics of the post-collision stretching of the South and North Qiangtang blocks, Lhasa-South Qiangtang collision, Neo-Tethys ocean subduction, and Indo-Asian collision and N-S strike-slip movement, respectively, and experienced upliftings of 11.4, 2.85, 4.35 and 0.85 km, respectively. The QCUB probably was at sea level in the Early Cretaceous, and rapidly uplifted to 22.5 km in the Late Cretaceous; during 9020 Ma, the long term thrusting systems caused further uplifting to ~5 km, followed by differential surface uplifting due to the denudation effect of the Great Lakes and the south-north strike-slip action in the Miocene.

Key words: fission track, thermal history modeling, tectono-thermochronology, Central Uplift Belt, Qiangtang