干旱区生态环境知识资源中心(Arid): Episodic sediment accumulation linked to global change in the endorheic Qaidam Basin of the Tibetan Plateau revealed by feldspar luminescence dating

Arid

DOI	10.1016/j.quageo.2024.101522
	Episodic sediment accumulation linked to global change in the endorheic Qaidam Basin of the Tibetan Plateau revealed by feldspar luminescence dating
	Ding, Zhaojing; Gong, Songlin; Xiao, Guoqiao; Wang, Yixuan; Yuan, Weitao; Zhang, Jianwei; Wang, Jiang; Lai, Zhongping
通讯作者	Lai, ZP
来源期刊	QUATERNARY GEOCHRONOLOGY
ISSN	1871-1014
EISSN	1878-0350
出版年	2024
卷号	81
英文摘要	Given its high accumulation rate in sediments, the endorheic basin in arid regions plays a crucial role in reconstructing paleo-environment. However, it would not provide high-resolution climatic records if significant wind-eroded depositional hiatuses were inevitable within a severe wind environment. Unconformable contacts have been found during field survey in the top part of the stratigraphy in the Qaidam Basin, a prototypical endorheic basin in central Asia. To elucidate whether the sediment is continuous, we employed luminescence dating methods of feldspar pIR 200 IR 250 and quartz OSL to date sediments, including lacustrine sediments and salt crusts, from the Qarhan Playa that is the Quaternary depositional center of the Qaidam Basin. Various experiment tests, including preheat plateau, dose recovery, and residual dose, were conducted. The dating results show that the feldspar pIR 200 IR 250 can provide dependable ages with negligible residual doses. The pIR 200 IR 250 dating ages within the last glacial cycle reveal several environmental shifts. A Qarhan paleolake in Marine Isotope Stage (MIS) 5 was demonstrated by the cluster ages of similar to 140-80 ka of lacustrine sediments. The salt crust ages of 136 +/- 10 ka and 97 +/- 6 ka indicate that, before completely disappeared, the paleolake with shallow dish-shape depression had been dried up more than once, illustrating shallow-dry-shallow cycles. The playa in the eastern Qaidam Basin evolved mainly in warm periods, such as MIS 5 and MIS 1, supported by the salt crust ages of MIS 5 (136 +/- 10 ka and 97 +/- 6 ka) and MIS 1 (10 +/- 1 ka and 0.6 +/- 0.1 ka). Depositional hiatus in the last glacial cycle were identified by unconformable contacts in three sections between the lacustrine strata and their overlying playa strata, with corresponding age gaps of 158 +/- 20-97 +/- 6 ka, 131 +/- 10-10 +/- 1 ka, and 84 +/- 7-0.6 +/- 0.1 ka, respectively. In all the three sections the sediments for the whole of the last glacial period is missing, eroded by wind. This process should have occurred periodically during the glacial-interglacial cycles of the orbital global climatic changes. The results also show that hiatuses are common for endorheic basins on the Earth with age gaps of up to similar to 100 ka, suggesting that robust chronology should be established before any climatic correlation due to severe wind erosion leading to episodic sediment accumulation.
英文关键词	Endorheic Qaidam Basin Depositional hiatus Global environmental change Luminescence dating Tibetan plateau
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:001215902400001
WOS关键词	CENTRAL GOBI DESERT ; AEOLIAN SEDIMENTS ; OSL CHRONOLOGY ; SALT CRUST ; QUARTZ OSL ; GRAIN-SIZE ; SHELL BAR ; EVOLUTION ; RECORD ; LAKES
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/2XILL650/405242
推荐引用方式 GB/T 7714	Ding, Zhaojing,Gong, Songlin,Xiao, Guoqiao,et al. Episodic sediment accumulation linked to global change in the endorheic Qaidam Basin of the Tibetan Plateau revealed by feldspar luminescence dating[J],2024,81.
APA	Ding, Zhaojing.,Gong, Songlin.,Xiao, Guoqiao.,Wang, Yixuan.,Yuan, Weitao.,...&Lai, Zhongping.(2024).Episodic sediment accumulation linked to global change in the endorheic Qaidam Basin of the Tibetan Plateau revealed by feldspar luminescence dating.QUATERNARY GEOCHRONOLOGY,81.
MLA	Ding, Zhaojing,et al."Episodic sediment accumulation linked to global change in the endorheic Qaidam Basin of the Tibetan Plateau revealed by feldspar luminescence dating".QUATERNARY GEOCHRONOLOGY 81(2024).