Kinematics of Late Quaternary Slip Along the Qishan‐Mazhao Fault: Implications for Tectonic Deformation on the Southwestern Ordos, China. Issue 9 (9th September 2018)

• Record Type: Journal Article
• Authors: Li, Xinnan; Zhang, Peizhen; Zheng, Wenjun; Feng, Xijie; Li, Chuanyou; Pierce, Ian K. D.; Xu, Hongyan; Li, Xiaoni; Ai, Ming; Chen, Gan; Dong, Jinyuan; Liu, Jinrui; Ren, Guangxue
• Is Part Of: Tectonics. Volume 37:Issue 9(2018)
• Page Start: 2983
• Page End: 3000
• Publication Date: 2018-09-09
• Subjects: Qishan‐Mazhao fault -- southwestern Ordos -- Late Quaternary -- slip rate -- kinematics -- tectonic deformation; Geology, Structural -- Periodicals; 551.8
• DOI: 10.1029/2018TC005043
• Languages: English
• ISSNs: 0278-7407

Abstract

Abstract: The northwest striking Qishan‐Mazhao fault (QMF) accommodates complex deformation in the Tibet‐Ordos transition zone. We studied the geologic and geomorphic expression of the QMF using interpretations of high‐resolution satellite images and structure‐from‐motion models combined with detailed field investigations. Displaced loess tablelands, stream channels, and fluvial terraces show that the QMF is predominately a left‐lateral strike‐slip fault with a minor normal component. The magnetic susceptibility and optically stimulated luminescence ages of offset fluvial terraces yield left‐lateral slip rates ranging from 0.5 to 1.0 mm/year. Regionally, the QMF and the Haiyuan fault (HYF) form a large right step, in which the Liupanshan Mountains are located. The QMF shares a similar orientation and sense of motion to the HYF, suggesting that the left‐lateral slip of the HYF is not completely absorbed as crustal shortening across the Liupanshan Mountains but is partially transferred to slip along the QMF. Key Points: The northwest striking QMF is a left‐lateral fault with a minor oblique normal component Left‐lateral slip of the HYF is partially transferred by slip (~0.5–1.0 mm/year) along the QMF Tectonic deformation on the southwestern Ordos is strongly controlled by the northeastward expansion of the Tibetan Plateau