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

最小化 最大化

Vol15 No.11: 2398-2408

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

Author】GUO Fu-sheng1; CHEN Liu-qin1,2,3*; XU Huan3; LIU Xin3

Addresses】1 State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang 330013, China; 2 Shandong Provincial Key Laboratory of Depositional Mineralization & Sedimentary Minerals, Shandong University of Science and Technology, Qingdao 266590, China; 3 School of Earth Sciences, East China University of Technology, Nanchang 330013, China

Corresponding author】CHEN Liu-qin

Citation】Guo FS, Chen LQ, Xu H, Liu X (2018) Origin of beaded tafoni in cliffs of Danxia landscapes, Longhushan Global Geopark, South China. Journal of Mountain Science 15(11). https://doi.org/10.1007/s11629-018-4947-9

DOI】https://doi.org/10.1007/s11629-018-4947-9

Abstract】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.

Keywords】Beaded tafoni; Alluvial red beds; Danxia landscape; Longhushan Global Geopark