干旱区生态环境知识资源中心(Arid): The largest deflation basin in Asia reveals that the Miocene basin-filling sediments in the eastern Gobi Desert are an important dust source

Arid

DOI	10.1016/j.geomorph.2023.108780
	The largest deflation basin in Asia reveals that the Miocene basin-filling sediments in the eastern Gobi Desert are an important dust source
	Yin, Jingxian; Han, Zhiyong; Zeng, Yuqiang; Qin, Lisha; Pan, Rouxian; Zhou, Yuwen; Lu, Ming; Zhang, Hanzhi; Li, Xusheng
通讯作者	Han, ZY ; Li, XS
来源期刊	GEOMORPHOLOGY
ISSN	0169-555X
EISSN	1872-695X
出版年	2023
卷号	436
英文摘要	Deflation is one of the most important exogenic forces in arid and semiarid regions. It not only shapes various wind erosion landforms but also releases a large amount of dust into the atmosphere. The Sunite Steppe in the eastern Gobi Desert is located in arid areas, where Neogene strata are widely distributed. However, the deflation process and its impact on landforms in this area are still unclear. We conducted comprehensive research on stratigraphy, sedimentology and geomorphology and found that there is a giant deflation basin (Sunite Deflation Basin) located to the west of the Otindag Sandy Land and to the east of the Tunggur Platform (Tamuqintala High Platform). With an area of over 8000 km2 and a volume of -393 km3, that deflation basin ranks second only to the Qattara Depression in North Africa and is much larger than Big Hollow in the United States; it is the second largest deflation basin in the world and the largest in Asia. Unlike the Qattara Depression (comma-like) and Big Hollow (rod-like), the Sunite Deflation Basin is shell-like in planform. The western edge of the basin is well defined with steep basin walls, indicating that the basin was developed on the ground represented by the Tunggur Platform. The basin bottom gradually becomes shallower from west to east, which is consistent with the prevailing westerly. Subordinate deflation basins, deflation mounds and blowouts are widely distributed in the Sunite Deflation Basin. The basement of the basin is mainly composed of Miocene alluvium and red clay, i.e., basin-filling sediments. The amount of dust (<20 & mu;m) released from the basin that can be transported over long distances is preliminarily estimated to be as high as 216 km3. If all dust is deposited in the downwind loess area (-37,200 km2) near Chifeng in Northeast China, the deposition thickness can reach -5.8 m. Nd isotope and U-Pb detrital zircon data suggest that the Miocene basin-filling sediments comprise aeolian deposits derived from the Gobi Desert and fluvial deposits derived from the Yinshan-Yanshan Orogenic Belt. The Sunite Deflation Basin must have begun forming after the deposition of basin-filling sediments (-7.5 Ma) and most likely began to develop at -3.6 Ma as a result of the strengthened East Asian winter monsoon due to global cooling.
英文关键词	Sunite Deflation basin Basin basement Dust Sediment source
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:001025391500001
WOS关键词	HUNSHANDAKE SANDY LAND ; NORTH PACIFIC-OCEAN ; CHINESE LOESS ; QATTARA DEPRESSION ; INNER-MONGOLIA ; GRAIN-SIZE ; PALEOCLIMATIC SIGNIFICANCE ; EOLIAN DEPOSITION ; TIBETAN PLATEAU ; SEMIARID CHINA
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS研究方向	Physical Geography ; Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/396722
推荐引用方式 GB/T 7714	Yin, Jingxian,Han, Zhiyong,Zeng, Yuqiang,et al. The largest deflation basin in Asia reveals that the Miocene basin-filling sediments in the eastern Gobi Desert are an important dust source[J],2023,436.
APA	Yin, Jingxian.,Han, Zhiyong.,Zeng, Yuqiang.,Qin, Lisha.,Pan, Rouxian.,...&Li, Xusheng.(2023).The largest deflation basin in Asia reveals that the Miocene basin-filling sediments in the eastern Gobi Desert are an important dust source.GEOMORPHOLOGY,436.
MLA	Yin, Jingxian,et al."The largest deflation basin in Asia reveals that the Miocene basin-filling sediments in the eastern Gobi Desert are an important dust source".GEOMORPHOLOGY 436(2023).