Stratigraphic architecture and activity of the alluvial fan in the eastern piedmont of the Liupan Mountains since the Late Pleistocene
YAO Zi-Heng1(), DONG Xiao-Peng2,3,4(), YANG Yong5
1. Geological Environment Exploration Institute of Jiangsu Province, Nanjing 211100, China 2. Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China 3. Key Laboratory of Paleomagnetism and Tectonic Reconstruction, Ministry of Natural Resources, Beijing 100081, China 4. Key Laboratory of Active Tectonics and Geological Safety, Ministry of Natural Resources, Beijing 100081, China 5. Geological Survey Institute of Ningxia Hui Autonomous Region, Yinchuan 750021, China
中国中、西部城市或城镇居民区有很多位于山前冲积扇形成的冲积平原之上,揭露冲积扇的地质结构和稳定性对城市建设规划和土地合理利用具有重要意义。六盘山东麓冲积扇上分布有固原市城镇居民区和村落,人口密集。冲积扇发育多套事件沉积层,记录了构造活动和气候转变控制下冲积扇的活动性特征。本文通过野外地质调查、光释光测年、可控源音频大地电测深和常规氡气测量等手段,揭露了六盘山东麓冲积扇地层结构,厘定了晚更新世以来两期事件沉积层,沉积时代分别为~43.33 ka B.P.和22.92~20.72 ka B.P.。基于可控源音频大地电磁测量和常规氡气测量结果,揭示在海原断裂带和清水河断裂活动的影响下,六盘山东麓冲积扇至今仍存在较高活动性。该研究结果可以为六盘山地区地壳稳定性评价、地质灾害防治和工程设施建设提供基础数据支撑。
Many cities or urban residential areas in central and western China reside in alluvial plains formed from piedmont alluvial fans. Hence, revealing the stratigraphic architectures and stability of alluvial fans holds critical significance for urban construction planning and rational land use. The alluvial fan in the eastern piedmont of the Liupan Mountains hosts the urban residential areas and villages of Guyuan City, with a dense population. Moreover, the alluvial fan develops several event deposits recording the activity of the alluvial fan under tectonic movements and climatic changes. Through field geological survey, optically stimulated luminescence dating, controlled source audio-frequency magnetotellurics (CSAMT), and conventional radon measurement, this study revealed the stratigraphic architecture of the alluvial fan and its two-phase event deposits (~43.33 ka B.P. and 22.92~20.72 ka B.P) since the Late Pleistocene. As indicated by the CSAMT and conventional radon measurement results, the alluvial fan still exhibits high activity under the influence of the Haiyuan and Qingshuihe faults. The results of this study provide fundamental data for crustal stability assessment, prevention and control of geologic hazards, and engineering construction in the Liupanshan area.
姚子恒, 董晓朋, 杨勇. 六盘山东麓冲积扇晚更新世以来地层结构及其活动性特征[J]. 物探与化探, 2025, 49(1): 1-13.
YAO Zi-Heng, DONG Xiao-Peng, YANG Yong. Stratigraphic architecture and activity of the alluvial fan in the eastern piedmont of the Liupan Mountains since the Late Pleistocene. Geophysical and Geochemical Exploration, 2025, 49(1): 1-13.
Fig.7 六盘山东麓冲积扇晚更新世末以来活动性与断裂带构造活动、气候变化序列对比关系 (海原断裂带晚更新世末活动性据Zhang et al.[22]、冉永康等[43]、向宏发等[18]、张培震等[44]、肖骏等[23];古里雅冰芯气候记录据姚檀栋等[46];深海氧同位素气候记录据Martinson et al.[54])
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