
科学技术与工程

中国技术经济学会
Tectonic Evolution and Uplift Processes of Helan Mountains Since the Paleozoic
Jing-wen MAO , Jiang-hai LI , Hao-kun YANG , Xiao-fei GUO
Science Technology and Engineering ›› 2026, Vol. 26 ›› Issue (26) : 11151 -11160.
The Helan Mountains, located at the northwestern margin of the North China Craton, represent a key area for investigating intracontinental tectonic deformation in Asia. In order to explore the tectonic evolution and uplift process of the Helan Mountains since the Paleozoic,the tectonic evolution process of the Helan Mountains since the Paleozoic was systematically analyzed and summarized through literature review, field survey data, and paleoplate kinematics data. By examining the change of plate motion rate from a macro plate the kinematic perspective, the uplift periods of Helan Mountains were correlated. The results indicate that since the Paleozoic, the Helan Mountains have experienced four evolutionary stages: an Early Paleozoic passive continental margin basin, a Late Paleozoic back-arc extensional basin, a Mesozoic foreland basin, and the Cenozoic Helan Mountains-Yinchuan graben-horst structure. The uplift of the Helan Mountains mainly occurred during the Mesozoic and Cenozoic. Considering the periods when the latitudinal movement rate of tectonic plates decreased, it is proposed that the Helan Mountains may have experienced uplift during six Mesozoic intervals: 240~235 Ma, 169~165 Ma, 155~147 Ma, 139~129 Ma, 92~87 Ma, and 75~72 Ma. During the Cenozoic, influenced by the Himalayan orogeny and the far-field effects of the Tibetan Plateau uplift, the mountains may have undergone rapid uplift during two intervals: 56~50 Ma and 30~10 Ma. These findings demonstrate a close relationship between the tectonic evolution of the Helan Mountains and regional plate motions, providing insights into the far-field response mechanisms of intracontinental deformation.
Helan Mountains / structural evolution / plate drift / uplift periods / reconstruction of ancient tectonic plates
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