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Discovery of Periglacial Phenomena in the Late Stage of Last Glacial Maximum at the Upper to Middle Reaches of Qingshuihe River, Ningxia, China(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2022年第03期
Page:
524-534
Research Field:
环境与可持续发展
Publishing date:

Info

Title:
Discovery of Periglacial Phenomena in the Late Stage of Last Glacial Maximum at the Upper to Middle Reaches of Qingshuihe River, Ningxia, China
Author(s):
DONG Xiao-peng1; 2;  LI Zhen-hong1; 2*;  CUI Jia-wei1; 2;  HUANG Ting1; 2;  MA Zhao-ying1; 2; 3;  KOU Lin-lin1; 2
(1. Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China; 2. Key Laboratory of Paleomagnetism and Tectonic Reconstruction of Ministry of Natural Resources, Beijing 100081, China; 3. School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China)
Keywords:
last glacial period;  periglacial phenomena;  ice wedge pseudomorph;  cryoturbation;  Qingshuihe river basin;  Younger Dryas;  southern limit of latitudinal permafrost;  Ningxia
PACS:
P56; P66
DOI:
10.19814/j.jese.2022.02016
Abstract:
Periglacial phenomena are of great significance for reconstructing the paleo-climate in a certain stage or area, and depicting the southern limit of latitudinal permafrost. Periglacial phenomena, including cryoturbations and ice wedge pseudomorphs, formed during the late stage of Last Glacial Maximum, were discovered in the valley at the middle to upper reaches of Qingshuihe River, Ningxia, China(36°22'5″N-36°25'53″N). Four ice wedge pseudomorphs were discovered in the Tangbaocun section(36°22'5″N, 106°8'25″E). The ice wedge pseudomorphs in the Tangbaocun section are characterized by wedges with wider top and narrower bottom. The wedge wall is irregular, and clasts of wall sediments and brown-red silt lacking of stratifications were filled in the wedges. Adjacent to the wedge wall, there are a series of fractures formed before the collapse of wall sediments. In the Sanchahe section(36°25'53″N, 106°8'34″E), there developed two layers with a series of cryoturbations. As for the cryoturbations in the Sanchahe section, the inclinations of axial planes varied irregularly; the axis did not grow thicker or thin significantly; there was no interlayer sliding in the limbs; the wedge top had not been truncated, and there was no interlayer thrust or normal fault in the interlayer folds. The ice wedge pseudomorphs and cryoturbations might be triggered by the same single cold climate event during the period of ～14 to ～11 ka B.P. The presence of ice wedge pseudomorphs(14.06-11.45 ka B.P.)and cryoturbations(13 500-11 570 a B.P.)during the last stage of Last Permafrost Maximum(LPMax)indicates that the development of permafrost at the upper to middle reaches of Qingshuihe River, Ningxia has significantly lowered paleo-temperature and close relationship with Younger Dryas. Moreover, the southern limit of latitudinal permafrost could have reached as far south to 36°22'5″N. Therefore, the west part of southern limit of latitudinal permafrost since ～20 ka B.P. in North China at mid-latitudes may have moved southwards by ～52' in latitude and ～97 km in surface distance to the locations of cryoturbations in the lower reach of Qingshuihe River. This discovery provides new evidence for the reconstruction of the southern limit of latitudinal permafrost during the Last Permafrost Maximum in North China.

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