Very Large Cryoturbation Structures of Last Permafrost Maximum Age at the Foot of Qilian Mountains (NE Tibet Plateau, China): a Discussion
Abstract Intensely cold conditions occurred during part of the last major glaciation of the mountains and Qinghai–Tibet Plateau in northeast China but their chronology is constrained by few limiting ages. At the Mengyuan section, on the northeastern margin of the Qilian Mountains, sandy silt provide...
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Online Access: | http://dx.doi.org/10.1002/ppp.1942 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fppp.1942 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ppp.1942 |
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crwiley:10.1002/ppp.1942 2024-06-02T08:08:02+00:00 Very Large Cryoturbation Structures of Last Permafrost Maximum Age at the Foot of Qilian Mountains (NE Tibet Plateau, China): a Discussion Harris, Stuart A. Jin, Huijun He, Ruixia Chinese Academy of Sciences 2017 http://dx.doi.org/10.1002/ppp.1942 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fppp.1942 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ppp.1942 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Permafrost and Periglacial Processes volume 28, issue 4, page 757-762 ISSN 1045-6740 1099-1530 journal-article 2017 crwiley https://doi.org/10.1002/ppp.1942 2024-05-03T10:39:39Z Abstract Intensely cold conditions occurred during part of the last major glaciation of the mountains and Qinghai–Tibet Plateau in northeast China but their chronology is constrained by few limiting ages. At the Mengyuan section, on the northeastern margin of the Qilian Mountains, sandy silt provided three OSL ages that suggest deposition during a very cold, dry period in northeastern China between c . 29 and 19 ka (early part of marine isotope stage (MIS) 2). Load‐casting into the underlying outwash gravel occurred during climate amelioration. In some cases, the sandy silt infilled the spaces left by underlying thawing blocks of ice without collapse of the surrounding gravel. The gravel must therefore be older than c . 30 ka and was probably deposited by outwash from glaciers on the higher parts of the Qilian Mountains during MIS 3. Included in them were buried contemporaneous or remnant blocks of glacial ice. Subsequently the surface became flat by unknown processes and was finally covered by a thin loess dating from 2.7 ka, indicating it was deposited in the first warmer period in the Neoglacial sequence of events. Thus, the last major cold event spanned the period through isotope stages 2 and 3 in this area (57 to c . 19 ka), during which the dominant effects of glaciation of the mountain tops were replaced by intensely dry, cold permafrost conditions for c . 10 ka. Copyright © 2017 John Wiley & Sons, Ltd. Article in Journal/Newspaper Ice permafrost Permafrost and Periglacial Processes Wiley Online Library Permafrost and Periglacial Processes 28 4 757 762 |
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English |
description |
Abstract Intensely cold conditions occurred during part of the last major glaciation of the mountains and Qinghai–Tibet Plateau in northeast China but their chronology is constrained by few limiting ages. At the Mengyuan section, on the northeastern margin of the Qilian Mountains, sandy silt provided three OSL ages that suggest deposition during a very cold, dry period in northeastern China between c . 29 and 19 ka (early part of marine isotope stage (MIS) 2). Load‐casting into the underlying outwash gravel occurred during climate amelioration. In some cases, the sandy silt infilled the spaces left by underlying thawing blocks of ice without collapse of the surrounding gravel. The gravel must therefore be older than c . 30 ka and was probably deposited by outwash from glaciers on the higher parts of the Qilian Mountains during MIS 3. Included in them were buried contemporaneous or remnant blocks of glacial ice. Subsequently the surface became flat by unknown processes and was finally covered by a thin loess dating from 2.7 ka, indicating it was deposited in the first warmer period in the Neoglacial sequence of events. Thus, the last major cold event spanned the period through isotope stages 2 and 3 in this area (57 to c . 19 ka), during which the dominant effects of glaciation of the mountain tops were replaced by intensely dry, cold permafrost conditions for c . 10 ka. Copyright © 2017 John Wiley & Sons, Ltd. |
author2 |
Chinese Academy of Sciences |
format |
Article in Journal/Newspaper |
author |
Harris, Stuart A. Jin, Huijun He, Ruixia |
spellingShingle |
Harris, Stuart A. Jin, Huijun He, Ruixia Very Large Cryoturbation Structures of Last Permafrost Maximum Age at the Foot of Qilian Mountains (NE Tibet Plateau, China): a Discussion |
author_facet |
Harris, Stuart A. Jin, Huijun He, Ruixia |
author_sort |
Harris, Stuart A. |
title |
Very Large Cryoturbation Structures of Last Permafrost Maximum Age at the Foot of Qilian Mountains (NE Tibet Plateau, China): a Discussion |
title_short |
Very Large Cryoturbation Structures of Last Permafrost Maximum Age at the Foot of Qilian Mountains (NE Tibet Plateau, China): a Discussion |
title_full |
Very Large Cryoturbation Structures of Last Permafrost Maximum Age at the Foot of Qilian Mountains (NE Tibet Plateau, China): a Discussion |
title_fullStr |
Very Large Cryoturbation Structures of Last Permafrost Maximum Age at the Foot of Qilian Mountains (NE Tibet Plateau, China): a Discussion |
title_full_unstemmed |
Very Large Cryoturbation Structures of Last Permafrost Maximum Age at the Foot of Qilian Mountains (NE Tibet Plateau, China): a Discussion |
title_sort |
very large cryoturbation structures of last permafrost maximum age at the foot of qilian mountains (ne tibet plateau, china): a discussion |
publisher |
Wiley |
publishDate |
2017 |
url |
http://dx.doi.org/10.1002/ppp.1942 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fppp.1942 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ppp.1942 |
genre |
Ice permafrost Permafrost and Periglacial Processes |
genre_facet |
Ice permafrost Permafrost and Periglacial Processes |
op_source |
Permafrost and Periglacial Processes volume 28, issue 4, page 757-762 ISSN 1045-6740 1099-1530 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/ppp.1942 |
container_title |
Permafrost and Periglacial Processes |
container_volume |
28 |
container_issue |
4 |
container_start_page |
757 |
op_container_end_page |
762 |
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1800753184170311680 |