Abstract:Objectives: The North—South Tectonic Belt is a significant boundary between the east and west parts of Chinese continent in geological structure, geophysical field and surface system, and is also one of the major regions of strong earthquakes in the continental interior. However, the inner link of the geological events during the Mesozoic is still ambiguous. This paper is aimed to discuss the geological events and tectonic evolution of the northern North—South Tectonic Belt. Methods: Based on a large amount of low temperature thermochronology data, magmatic events, tectonic events and other depositional events, analysis the distribution sequence, depositional response and the inherent coupling relationship of these Mesozoic tectonic events. Results: Fission track ages indicate that the study area underwent four cooling events which occurred in the Late Triassic—Early Jurassic (220~180 Ma), Late Jurassic—Early Cretaceous (160~135 Ma), and late Early Cretaceous—Paleocene (110~60 Ma). Futhermore, the north segment of the North—South Tectonic Belt experienced a serious of volcanic eruptions, tuff deposition and other depositional events during the Mesozoic. Conclusion: The north segment of the North—South Tectonic Belt experienced multiphase tectonic evolution. It triggered a series of significant geological events that were closely related with each other from the aspects of temporal and spatial distribution.