Origin of beaded tafoni in cliffs of Danxia landscapes,Longhushan Global Geopark, South China  

作　　者：GUO Fu-sheng CHEN Liu-qin XU Huan LIU Xin 

机构地区：[1]State Key Laboratory of Nuclear Resources and Environment, East China University of Technology [2]Shandong Provincial Key Laboratory of Depositional Mineralization & Sedimentary Minerals, Shandong University of Science and Technology [3]School of Earth Sciences, East China University of Technology

出　　处：《Journal of Mountain Science》2018年第11期2398-2408,共11页山地科学学报（英文）

基　　金：financially supported by National Natural Science Foundation of China (Grant Nos. 41772197, 41602113);Open Research Fund from the Shandong Provincial Key Laboratory of Depositional Mineralization & Sedimentary Minerals (Shandong University of Science and Technology; Grant No. DMSM2017011);Jiangxi Provincial Graduate Innovation Fund Project (YC2018-S336)

摘　　要：The tafoni that develop in sandstone cliffs have attracted the interest of both scientists and the general public. A necklace-like tafone system, referred to here as beaded tafoni, has developed in the prominent cliffs of the Danxia landscapes within the Longhushan Global Geopark in the subtropical zone of South China. This paper presents a new model of the formation of this system of extraordinary beaded tafoni. The cliffs of the Danxia landscapes of the study area are composed of an alluvial conglomerate(i.e.,red beds). These Danxia landscapes have subrounded summits that are covered by vegetation and experience a nearly vertical water flow induced by gravity. Erosion and collapse of the outsized gravels and concentrated pebbles in the red beds give rise to the initial development of the beaded tafoni. The tafoni then become rounded and beaded as a result of reworking and decay by fluvial outwash. During storms, intense water flows run vertically down the cliffs and generate a whirling motion in the tafoni.Consequently, the inside walls of the tafoni gradually become wider and smoother. During the late development stage, the beaded tafoni tend to become indistinct or disappear because of the interconnection of the tafoni and subsequent merging with the bedding-controlled cavities.

关 键 词：Beaded tafoni Alluvial red beds Danxia landscape Longhushan Global Geopark 

分 类 号：P942[天文地球—自然地理学]