Formation of the Huajiang Grand Canyon (southwestern China) driven by the evolution of a Late Pleistocene tiankeng  

作　　者：Yunlong Fan Andrea Columbu Kangning Xiong Guangjie Luo Song Li Xuefeng Wang Yangyang Wu 

机构地区：[1]Key Laboratory of Western China’s Environmental Systems(Ministry of Education),College of Earth and Environmental Sciences,Lanzhou University,Lanzhou 730000,Gansu,China [2]Guizhou Provincial Key Laboratory of Geographic State Monitoring of Watershed,School of Geography and Resource Science,Guizhou Education University,Guiyang 550018,Guizhou,China [3]Department of Chemistry,Life Sciences and Environmental Sustainability,University of Parma,43124 Parma,Italy [4]School of Karst Science,Guizhou Normal University,Guiyang 550001,Guizhou,China [5]Key Laboratory of Cenozoic Geology and Environment,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China

出　　处：《Acta Geochimica》2022年第1期1-11,共11页地球化学学报（英文）

基　　金：funded by the National Natural Science Foundation of China(Grant Nos:42061001,41501006);The Science and Technology Foundation of Guizhou Province(Grant Nos:Qianke Jichu-ZK[2021]190);Natural science research funding project of Guizhou Provincial Department of Education(Grant No.:Qian Jiao KY[2021]036).

摘　　要：Collapse is a common geomorphic process in karst areas,especially on the Yunnan-Guizhou Plateau,which has a tectonic background of integral uplift.The frequent occurrence of collapse processes in karst underground caves and canyons indicates that collapses play an important role in the formation of canyons.Through an analysis of the morphology of a semicircular cliff in the Huajiang Grand Canyon and an investigation of sediments at the bottom of the cliff,a large-scale collapse event was found to have occurred.U-series dating of secondary calcium carbonate cement in the collapse breccias indicates that collapse processes occurred approximately 200 ka.According to the geomorphological evolution of the Huajiang Grand Canyon,the following geomorphic evolutionary process is proposed:underground river-cave hall-collapse of a tiankeng-tiankeng degradation-canyon formation.These findings also show that the dating of collapsed breccia cement can be effectively used to determine the development times of karst canyons and the formation ages of tiankengs.

关 键 词：CANYON Cave collapse TIANKENG Karst breccias Yunnan-Guizhou Plateau 

分 类 号：P548[天文地球—构造地质学] P931[天文地球—地质学]