干旱区生态环境知识资源中心(Arid): A new type of polygonal terrain formed by sulfate weathering in arid regions

Arid

DOI	10.1016/j.geomorph.2021.107695
	A new type of polygonal terrain formed by sulfate weathering in arid regions
	Cheng, Rui-Lin; He, Hongping; Michalski, Joseph Ryan; Li, Yi-Liang
通讯作者	Michalski, JR (corresponding author), Univ Hong Kong, Dept Earth Sci, Pokfulam, Hong Kong, Peoples R China.
来源期刊	GEOMORPHOLOGY
ISSN	0169-555X
EISSN	1872-695X
出版年	2021
卷号	383
英文摘要	Polygonal terrain (or simply, polygons) is a common geomorphological feature in arid regions. Polygons with diverse shapes and different sizes ranging from several meters to more than one hundred meters are widespread in playas. Here, we report a new geometric type of polygons in the playas in the western Qaidam Basin on the northern Tibetan Plateau. These polygons are characterized by raised rims that are interlocked with each other, forming irregular boundaries resembling jigsaw puzzle piece-shapes. The average size of these polygons is around 80 m, which is larger than most of the reported polygons in playas elsewhere. While most polygonal terrain in playa environments is bounded by cracks generated by desiccation or thermal contraction, these unusual features are delimited by raised rims likely caused by a chemical weathering process. Thenardite, a dense anhydrous sodium sulfate mineral originally formed in a saline playa, has been weathered and hydrated to form widespread gypsum. As gypsum leads to a larger volume than thenardite during precipitation, we propose that the volume expansion develops the raised rims of polygons as pressure ridges. ? 2021 Elsevier B.V. All rights reserved.
英文关键词	Polygons Sulfate weathering Playas Qaidam Basin
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000640909500004
WOS关键词	WESTERN QAIDAM BASIN ; TIBETAN PLATEAU ; STRUCTURAL GEOLOGY ; MARS ; PLAYA ; EVOLUTION ; SALT ; PATTERNS ; SURFACE ; CHINA
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS研究方向	Physical Geography ; Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/350412
作者单位	[Cheng, Rui-Lin; Michalski, Joseph Ryan; Li, Yi-Liang] Univ Hong Kong, Dept Earth Sci, Pokfulam, Hong Kong, Peoples R China; [He, Hongping] Chinese Acad Sci, Guangzhou Inst Geochem, Key Lab Mineral & Metallogeny, Guangdong Prov Key Lab Mineral Phys & Mat, Guangzhou 510640, Peoples R China; [He, Hongping] Univ Chinese Acad Sci, Beijing 100049, Peoples R China; [Michalski, Joseph Ryan] Univ Hong Kong, Lab Space Res, Pokfulam, Hong Kong, Peoples R China; [Li, Yi-Liang] USTC, CAS Ctr Excellence Comparat Planetol, Hefei 230026, Peoples R China
推荐引用方式 GB/T 7714	Cheng, Rui-Lin,He, Hongping,Michalski, Joseph Ryan,et al. A new type of polygonal terrain formed by sulfate weathering in arid regions[J],2021,383.
APA	Cheng, Rui-Lin,He, Hongping,Michalski, Joseph Ryan,&Li, Yi-Liang.(2021).A new type of polygonal terrain formed by sulfate weathering in arid regions.GEOMORPHOLOGY,383.
MLA	Cheng, Rui-Lin,et al."A new type of polygonal terrain formed by sulfate weathering in arid regions".GEOMORPHOLOGY 383(2021).