Abstract:
In order to shed light on the tectonic evolution processes of the north China block, we applied apatite fission track thermochronology method to the central Taiyue Mountain as a major mountain range in Shanxi massif. The results reveal that since the late middle Jurassic the central Taiyue Mountain experienced a pulsed uplift and exhumation at shallow crustal levels, which could be summarized as four rapid uplift and exhumation stages at 165~112 Ma, 103~85 Ma, 80~50 Ma and since ~28 Ma. These fission track ages show a positive correlation with the altitude, and the exhumation rate is estimated as ~8.4 m/Ma. The denudation rate increases gradually from 14.9~18.1 m/Ma since the late early Cretaceous to 50.5~64.7 m/Ma since the Eocene, reflecting the episodic and accelerated uplift and exhumation of the central Taiyue Mountains since the late Early Cretaceous. The Mesozoic-Cenozoic uplift history of the central Taiyue Mountain has a certain consistency with the evolution history of the Taihang Mountain, Lüliang Mountain in Shanxi massif, which is also coupled with the rapid subsidence of the Fenwei rift valley.