干旱区生态环境知识资源中心(Arid): Palaeoenvironmental changes in the central part of the Taklamakan Desert, northwestern China since the late Pleistocene

Arid

DOI	10.1360/TB-2020-1383
	Palaeoenvironmental changes in the central part of the Taklamakan Desert, northwestern China since the late Pleistocene
	Yang, Xiaoping; Du, Jinhua; Liang, Peng; Zhang, Deguo; Chen, Bo; Rioual, Patrick; Zhang, Feng; Li, Hongwei; Wang, Xulong
通讯作者	Yang, XP (corresponding author), Zhejiang Univ, Sch Earth Sci, Key Lab Geosci Big Data & Deep Resource Zhejiang, Hangzhou 310027, Peoples R China.
来源期刊	CHINESE SCIENCE BULLETIN-CHINESE
ISSN	0023-074X
EISSN	2095-9419
出版年	2021
卷号	66 期号:24 页码:3205-3218
英文摘要	The Taklamakan Desert, with an area of 337600 km(2) and located in the Tarim Basin of southern Xinjiang, is the largest sand sea in the mid-latitudes on Earth. Previous understanding about palaeoclimate of this vast arid landscape was mostly deciphered from loess sequences found in the surrounding mountains, while only a few in situ investigations in the sand sea were carried out. In light of the advances in the optically stimulated luminescence (OSL) dating techniques during the last decades, reconstructing palaeoenvironmental changes via studying aeolian sands in the interior of sand seas can now be achieved by careful observations in the field and by application of improved protocols of OSL dating methods. We used the new multiple-aliquot regenerative-dose (MAR) protocol with carefully selected preheat conditions of 230 degrees C for 10 s to date all samples which are distinctly younger than the upper age limit of this dating procedure, confirming that our chronology is scientifically robust. This paper reveals facies changes and the OSL chronologies of nine sedimentary sections showing interactions between fluvial, lacustrine (including slack-water) and aeolian processes in the central part of the Taklamakan. At present all sites of these sections are undergoing aeolian processes. The occurrences of fluvial and lacustrine (including slack-water) sediments in these sections indicate that many parts of the sand sea were shaped by rivers and inundated by water for long durations in the past. The initiations of occurrence of rivers and lakes (including slack-water) show some cyclicity according to the OSL ages. Our palaeoenvironmental interpretations of the different sedimentary facies in the field are supported by the data of palaeoclimatic proxies including color, grain sizes and magnetic susceptibility. The nine sections collectively suggest that three moist periods occurred in the Taklamakan Sand Sea since the late Pleistocene, i.e., similar to 70-50 ka (1 ka = 1000 years before 2010 CE), the late glacial of the last glaciation (similar to 17-11 ka) and the late Holocene (similar to 5-2 ka). During these moist periods, wetlands like fluvial channels, lakes (including slack-waters) occurred in the interior part of the Taklamakan, in the lower reaches of the Keriya and Andier Rivers and in the southern side of the Tarim River. The timing of the moist conditions in the Taklamakan Desert concurred with the intervals when global temperatures shifted from cold to warm stages. Thus we deduce that the wetter conditions in the Taklamakan were likely associated with increased runoffs of the rivers flowing into the desert with headwaters in the surrounding mountains. The amount of runoffs was dependent on regional precipitation and more importantly on the melting of snow and glaciers in the headwater regions. Palaeoclimatic simulations indicate that moistures of the Taklamakan Desert were transported mainly by mid-latitude westerlies both during the last Glacial Maximum and the Mid-Holocene. It is likely that the southward shift of westerlies due to the intensifying of Arctic Oscillation resulted in more orographic precipitations in the surrounding mountains of the Taklamakan Desert. We conclude that the increase of runoffs due to the increased melting of snow and glaciers during the transitional periods from cold to warm intervals allowed for the development of wetlands and provided water resources for the prosperity of early civilizations in the largest desert of China. Thus the features and driving factors of late Quaternary palaeoenvironmental changes in the Taklamakan are different from those in the middle and eastern portions of the desert belt in northern China where the palaeoclimate fluctuations were largely triggered by the monsoon system.
英文关键词	sand sea geomorphology Quaternary environmental change optically stimulated luminescence (OSL) dating
类型	Article
语种	中文
开放获取类型	Bronze
收录类别	ESCI
WOS记录号	WOS:000692669200011
WOS关键词	ENVIRONMENTAL-CHANGES ; HYDROLOGICAL CHANGES ; TARIM BASIN ; SAND SEAS ; LOESS ; LUMINESCENCE ; SEQUENCES ; XINJIANG ; HOLOCENE ; SOUTHERN
WOS类目	Multidisciplinary Sciences
WOS研究方向	Science & Technology - Other Topics
来源机构	新疆大学 ; 中国科学院地球环境研究所 ; 中国科学院地质与地球物理研究所
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/362859
作者单位	[Yang, Xiaoping; Liang, Peng; Zhang, Deguo; Chen, Bo; Li, Hongwei] Zhejiang Univ, Sch Earth Sci, Key Lab Geosci Big Data & Deep Resource Zhejiang, Hangzhou 310027, Peoples R China; [Du, Jinhua] Changan Univ, Sch Earth Sci & Resources, Xian 710064, Peoples R China; [Rioual, Patrick] Chinese Acad Sci, Inst Geol & Geophys, Key Lab Cenozo Geol & Environm, Beijing 100029, Peoples R China; [Zhang, Feng] Xinjiang Univ, Coll Resource & Environm Sci, Urumqi 830046, Peoples R China; [Wang, Xulong] Chinese Acad Sci, State Key Lab Loess & Quaternary Geol, Inst Earth Environm, Xian 710061, Peoples R China
推荐引用方式 GB/T 7714	Yang, Xiaoping,Du, Jinhua,Liang, Peng,et al. Palaeoenvironmental changes in the central part of the Taklamakan Desert, northwestern China since the late Pleistocene[J]. 新疆大学, 中国科学院地球环境研究所, 中国科学院地质与地球物理研究所,2021,66(24):3205-3218.
APA	Yang, Xiaoping.,Du, Jinhua.,Liang, Peng.,Zhang, Deguo.,Chen, Bo.,...&Wang, Xulong.(2021).Palaeoenvironmental changes in the central part of the Taklamakan Desert, northwestern China since the late Pleistocene.CHINESE SCIENCE BULLETIN-CHINESE,66(24),3205-3218.
MLA	Yang, Xiaoping,et al."Palaeoenvironmental changes in the central part of the Taklamakan Desert, northwestern China since the late Pleistocene".CHINESE SCIENCE BULLETIN-CHINESE 66.24(2021):3205-3218.