Contrasting characteristics and origin of Danxia arched rock shelters in Zhejiang,China,and natural arches and bridges on the Colorado Plateau,USA  

中国浙江丹霞拱形岩穴与美国科罗拉多高原天然石拱和天生桥特征与成因的对比研究

作　　者：TAN Yufang LI Lihui HUANG Beixiu 谭玉芳;李丽慧;黄北秀(Guangzhou Marine Geological Survey,Guangzhou 510760,China;Key Laboratory of Marine Mineral Resources,Ministry of Natural Resources,Guangzhou 510760,China;Institute of Geology and Geophysics,CAS,Beijing 100029,China;Innovation Academy for Earth Science,CAS,Beijing 100029,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]Guangzhou Marine Geological Survey,Guangzhou 510760,China [2]Key Laboratory of Marine Mineral Resources,Ministry of Natural Resources,Guangzhou 510760,China [3]Institute of Geology and Geophysics,CAS,Beijing 100029,China [4]Innovation Academy for Earth Science,CAS,Beijing 100029,China [5]University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Journal of Geographical Sciences》2021年第6期802-818,共17页地理学报（英文版）

基　　金：National Natural Science Foundation of China,No.41372322。

摘　　要：The red beds in Zhejiang province of China host the highest concentration of Danxia arched rock shelters in the world,just as the Colorado Plateau in the western USA hosts the world's largest concentration of natural arches and bridges.This study investigated the geological background of the arched rock shelters and compared them to the natural arches and bridges,based on field study and a literature review.It was found that Zhejiang arched rock shelters differ from Colorado Plateau natural arches and bridges in geometry and formation mechanism.Statistical geometric data on arch geometry shows that Danxia arched rock shelters in Zhejiang tend to be relatively flat.They are relatively low features with long spans,and great depth.The natural arches and bridges on the Colorado Plateau are similar to each other,but the bridges are larger than the arches.The geometric differences between the arched landforms could be attributed to their different geologic history and to their different formation mechanisms.The arched rock shelters in Zhejiang are formed by differential weathering between sandstone and conglomerate due to moisture-induced tensile stresses.In contrast,natural arches on the Colorado Plateau are closely related to the Salt Valley anticline,vertical tectonic fractures,and horizontal discontinuities in rock fins.The Colorado Plateau natural bridges were formed by river erosion.

关 键 词：red beds arched landforms features and formation mechanism comparative study 

分 类 号：P931[天文地球—自然地理学]