AMS14C测年对西安市长安区关家村古滑坡时代的约束
AMS14C Dating Constraints on the Age of Guanjiacun Ancient Landslide in Chang’an District of Xi’an City, China
摘要: 关家村古滑坡是分布于渭河地堑南部神禾塬黄土台塬边缘斜坡带的大型黄土古滑坡，其发育于马兰–午城黄土层内，具有典型的椅圈状地貌形态，发育早晚2个滑坡体，早晚滑坡体之间发育25~30 m宽的崩塌碎裂黄土带，显示滑坡经历了早期滑坡、中期崩塌和晚期滑坡3阶段的发育过程。通过对关家村古滑坡后缘洼地4件样品的加速质谱14C (AMS14C)测年，结果表明关家村古滑坡发生于32390 cal BP~1702 cal BP之间，结合对修建于滑坡体上的古寺庙年代考证，得出关家村古滑坡发生于1700~1800 cal BP的认识，为黄土高原第四纪滑坡时代分布研究提供了新资料。
Abstract: The Guanjiacun ancient landslide is a large ancient loess landslide distributed in the margin slope zone of the Shenheyuan loess tableland in the southern Weihe graben. It is developed in the Malan-Wucheng loess layer and has a typical chair-ring landform. Two landslide bodies of early and late stage are developed, and a 25~30 m wide collapse and cataclastic loess zone is developed between the early and late landslide bodies. It shows that the landslide has experienced three stages of development: early landslide, middle collapse and late landslide. Through the Accelerated Mass Spectrometry 14C (AMS14C) dating of four samples from the depression at the trailing edge of the Guanjiacun ancient landslide, the results show that the Guanjiacun ancient landslide occurred between 32390 cal BP and 1702 cal BP. Combined with the age of the ancient temple built on the landslide body, the understanding that the Guanjiacun ancient landslide occurred between 1700 and 1800 cal BP was obtained, which provided new data for the study of the Quaternary landslide age distribution on the Loess Plateau.
文章引用：徐松明, 黎敦朋. AMS14C测年对西安市长安区关家村古滑坡时代的约束[J]. 地球科学前沿, 2022, 12(12): 1586-1595. https://doi.org/10.12677/AG.2022.1212154

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