Thermal-contraction-crack networks as evidence for late-pleistocene permafrost in inner Mongolia, China
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...
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permafrost and periglacial processes
2004
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Online Access: | https://hdl.handle.net/20.500.11897/255716 https://doi.org/10.1002/ppp.476 |
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ftpekinguniv:oai:localhost:20.500.11897/255716 2023-05-15T16:37:06+02:00 Thermal-contraction-crack networks as evidence for late-pleistocene permafrost in inner Mongolia, China Vandenberghe, J Cui, ZJ Liang, Z Wei, Z Vandenberghe, J (reprint author), Free Univ Amsterdam, Fac Earth & Life Sci Quaternary Geol & Geomorphol, De Boelelaan 1085, NL-1081 BT Amsterdam, Netherlands. Free Univ Amsterdam, Inst Earth Sci, NL-1081 HV Amsterdam, Netherlands. Peking Univ, Dept Geog, Beijing 100871, Peoples R China. Chinese Acad Sci, Inst Earth Environm, Xian 700715, Peoples R China. Free Univ Amsterdam, Fac Earth & Life Sci Quaternary Geol & Geomorphol, De Boelelaan 1085, NL-1081 BT Amsterdam, Netherlands. 2004 https://hdl.handle.net/20.500.11897/255716 https://doi.org/10.1002/ppp.476 en eng permafrost and periglacial processes PERMAFROST AND PERIGLACIAL PROCESSES.2004,15,(1),21-29. 1008261 1045-6740 http://hdl.handle.net/20.500.11897/255716 doi:10.1002/ppp.476 WOS:000220763300002 SCI sand wedges inner Mongolia permafrost last glacial maximum palaeoclimate SAND VEINS WEDGES FEATURES AGE ICE Journal 2004 ftpekinguniv https://doi.org/20.500.11897/255716 https://doi.org/10.1002/ppp.476 2021-08-01T08:58:14Z 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. Geography, Physical Geology SCI(E) 0 ARTICLE 1 21-29 15 Journal/Newspaper Ice permafrost Permafrost and Periglacial Processes wedge* Peking University Institutional Repository (PKU IR) Permafrost and Periglacial Processes 15 1 21 29 |
institution |
Open Polar |
collection |
Peking University Institutional Repository (PKU IR) |
op_collection_id |
ftpekinguniv |
language |
English |
topic |
sand wedges inner Mongolia permafrost last glacial maximum palaeoclimate SAND VEINS WEDGES FEATURES AGE ICE |
spellingShingle |
sand wedges inner Mongolia permafrost last glacial maximum palaeoclimate SAND VEINS WEDGES FEATURES AGE ICE Vandenberghe, J Cui, ZJ Liang, Z Wei, Z Thermal-contraction-crack networks as evidence for late-pleistocene permafrost in inner Mongolia, China |
topic_facet |
sand wedges inner Mongolia permafrost last glacial maximum palaeoclimate SAND VEINS WEDGES FEATURES AGE ICE |
description |
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. Geography, Physical Geology SCI(E) 0 ARTICLE 1 21-29 15 |
author2 |
Vandenberghe, J (reprint author), Free Univ Amsterdam, Fac Earth & Life Sci Quaternary Geol & Geomorphol, De Boelelaan 1085, NL-1081 BT Amsterdam, Netherlands. Free Univ Amsterdam, Inst Earth Sci, NL-1081 HV Amsterdam, Netherlands. Peking Univ, Dept Geog, Beijing 100871, Peoples R China. Chinese Acad Sci, Inst Earth Environm, Xian 700715, Peoples R China. Free Univ Amsterdam, Fac Earth & Life Sci Quaternary Geol & Geomorphol, De Boelelaan 1085, NL-1081 BT Amsterdam, Netherlands. |
format |
Journal/Newspaper |
author |
Vandenberghe, J Cui, ZJ Liang, Z Wei, Z |
author_facet |
Vandenberghe, J Cui, ZJ Liang, Z Wei, Z |
author_sort |
Vandenberghe, J |
title |
Thermal-contraction-crack networks as evidence for late-pleistocene permafrost in inner Mongolia, China |
title_short |
Thermal-contraction-crack networks as evidence for late-pleistocene permafrost in inner Mongolia, China |
title_full |
Thermal-contraction-crack networks as evidence for late-pleistocene permafrost in inner Mongolia, China |
title_fullStr |
Thermal-contraction-crack networks as evidence for late-pleistocene permafrost in inner Mongolia, China |
title_full_unstemmed |
Thermal-contraction-crack networks as evidence for late-pleistocene permafrost in inner Mongolia, China |
title_sort |
thermal-contraction-crack networks as evidence for late-pleistocene permafrost in inner mongolia, china |
publisher |
permafrost and periglacial processes |
publishDate |
2004 |
url |
https://hdl.handle.net/20.500.11897/255716 https://doi.org/10.1002/ppp.476 |
genre |
Ice permafrost Permafrost and Periglacial Processes wedge* |
genre_facet |
Ice permafrost Permafrost and Periglacial Processes wedge* |
op_source |
SCI |
op_relation |
PERMAFROST AND PERIGLACIAL PROCESSES.2004,15,(1),21-29. 1008261 1045-6740 http://hdl.handle.net/20.500.11897/255716 doi:10.1002/ppp.476 WOS:000220763300002 |
op_doi |
https://doi.org/20.500.11897/255716 https://doi.org/10.1002/ppp.476 |
container_title |
Permafrost and Periglacial Processes |
container_volume |
15 |
container_issue |
1 |
container_start_page |
21 |
op_container_end_page |
29 |
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1766027400724873216 |