Thermal-contraction-crack networks as evidence for late-pleistocene permafrost in inner Mongolia, China

doi:10.1002/ppp.476

IEECAS OpenIR > 黄土与第四纪地质国家重点实验室（1985-2004）

	Thermal-contraction-crack networks as evidence for late-pleistocene permafrost in inner Mongolia, China
	Vandenberghe, J; Cui, ZJ; Liang, Z; Wei, Z
	2004
发表期刊	PERMAFROST AND PERIGLACIAL PROCESSES
卷号	15 期号:1 页码:21-29
文章类型	Article
摘要	Numerous wedges on the Ordos Plateau show typical characteristics of periglacial sand wedges that enable them to be distinguished from desiccation cracks in clayey illuviation soil horizons. The sand wedges are organized in two generations of polygonal networks. The older generation is a large-scale network with a diameter of 8 to 9 m and wedge depths up to more than 2 m. The younger generation has a mean diameter of 3 to 4m and is formed within the large networks. It consists of shallow (0.6 to 1 m deep) but relatively wide wedges. In contrast to the typical sand wedges that form within continuous permafrost, the shallow wedges formed probably as 'ground wedges' by seasonal freezing. Ice wedges and cryoturbations developed only rarely, and exclusively in the most humid areas. Thermal-contraction cracking occurred mainly between 26 and 20ka BP, indicating mean annual temperatures at least 13degreesC lower than present. Before and after that period mean annual temperatures were at least 7 to 8.5degrees lower than today. The presence of these periglacial phenomena show that the southern limit of continuous permafrost in Inner Mongolia occurred south of 38degreesN during the Last Glacial Maximum. Copyright (C) 2004 John Wiley Sons, Ltd.
关键词	sand wedges inner Mongolia permafrost last glacial maximum palaeoclimate
学科领域	Physical Geography ; Geology
DOI	10.1002/ppp.476
关键词[WOS]	SAND VEINS ; FEATURES ; WEDGES ; ICE ; AGE
收录类别	SCI ; SCIE
语种	英语
WOS研究方向	Geography, Physical ; Geology
WOS记录号	WOS:000220763300002
出版者	WILEY
引用统计	被引频次：44[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.ieecas.cn/handle/361006/11956
专题	黄土与第四纪地质国家重点实验室（1985-2004）
推荐引用方式 GB/T 7714	Vandenberghe, J,Cui, ZJ,Liang, Z,et al. Thermal-contraction-crack networks as evidence for late-pleistocene permafrost in inner Mongolia, China[J]. PERMAFROST AND PERIGLACIAL PROCESSES,2004,15(1):21-29.
APA	Vandenberghe, J,Cui, ZJ,Liang, Z,&Wei, Z.(2004).Thermal-contraction-crack networks as evidence for late-pleistocene permafrost in inner Mongolia, China.PERMAFROST AND PERIGLACIAL PROCESSES,15(1),21-29.
MLA	Vandenberghe, J,et al."Thermal-contraction-crack networks as evidence for late-pleistocene permafrost in inner Mongolia, China".PERMAFROST AND PERIGLACIAL PROCESSES 15.1(2004):21-29.