Formation and evolution of yardangs activated by Late Pleistocene tectonic movement in Dunhuang, Gansu Province of China

Journal of Earth system science

Xujiao Zhang1¹  Yuping Song1¹  Hao Chu1¹  Pengfei Ma1¹  Fadong Wu1¹  Peng Zeng1¹  Yanjie Wang1 2¹ 

[1] School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China.$$

关键词: Yardangs;    Late Pleistocene;    tectonic movement;    river terrace;    dating;   

DOI  :  

学科分类：天文学(综合)

来源: Indian Academy of Sciences

【 摘 要 】

Developed in the Anxi-Dunhuang basin, the yardangs of Dunhuang (western China) are clearly affected by tectonic movement. Based on fieldwork, this study ascertained three levels of river terrace in the area for the first time. Through the analysis of river terraces formation and regional tectonic movement, the study ascertained that the river terraces were formed mainly by Late Pleistocene tectonic uplift, which had activated the evolution of yardangs in the study area. By electron spin resonance (ESR) dating and optically stimulated luminescence (OSL) dating, the starting time and periodicity of the evolution of the yardangs were determined. The river terraces designated T3, T2 and T1 began to evolve at 109.0∼98.5, 72.9∼66.84 and 53.2∼38.0 kaBP, respectively, which is the evidence of regional neotectonic movement.And, the formation of the yardangs was dominated by tectonic uplift during the prenatal stage and mainly by wind erosion in the following evolution, with relatively short stationary phases. This research focused on the determination of endogenic processes of yardangs formation, which would contribute to further understanding of yardangs formation from a geological perspective and promote further study of yardang landform.

【 授权许可】

Unknown