气候变化领域集成服务门户(CCPortal): Late Mio-Pliocene landscape evolution around the Chaka Basin in the NE Tibetan Plateau: Insights from geochemical perspectives

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DOI	10.1016/j.palaeo.2020.109778
	Late Mio-Pliocene landscape evolution around the Chaka Basin in the NE Tibetan Plateau: Insights from geochemical perspectives
	Lü Y.; Zhang H.; Li B.; Jin Q.
发表日期	2020
ISSN	0031-0182
卷号	552
英文摘要	The present NE Tibetan Plateau is characterized by a rugged mountain range and basin landforms. Knowledge of the landscape evolution, as recorded by basin sediments, will help to understand the growth history of the NE Tibetan Plateau. Our present contribution targeted the Neogene Chaka Basin south of the Qinghai Nan Shan and reports 40 geochemical Sr, Nd, trace element, and rare earth element (REE) results of the sediments. Values of εNd vary from −15.6 to −11.6 for all samples, but εNd is higher for samples younger than 5.5 Ma. 87Sr/86Sr ratios are all between 0.71441 and 0.71844, with the variation becoming less after 4.5 Ma. Little variation in the Sr[sbnd]Nd isotopes and in the REE trend indicates that the source regions have very similar geochemical features. The contribution of aeolian loess into the basin sediments after ~3.5 Ma is also speculated from the trace element and REE results. These geochemical results reveal a change in the source region to the Qinghai Nan Shan around 4.5–5.5 Ma, which is consistent with previous lithoface evidence. Since ~3.5 Ma, landscape and topographic relief were further developed; thus, aeolian loess was deposited onto the fluvial fans south of the Qinghai Nan Shan, while global cooling and aridification began to dominate. Collectively, our present geochemical study of the Chaka Basin sediments reveals stages of landscape evolution in NE Tibet since the late Miocene. © 2020 Elsevier B.V.
英文关键词	Bulk geochemistry; Chaka Basin; Landscape evolution; Neogene; Tibetan Plateau
语种	英语
scopus关键词	aridification; cooling; geochemical survey; landscape evolution; lithostratigraphy; loess; Miocene; Pliocene; rare earth element; topographic effect; trace element; China; Qilian Mountains; Qinghai-Xizang Plateau
来源期刊	Palaeogeography, Palaeoclimatology, Palaeoecology
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/150465
作者单位	MLR Key Laboratory of Saline Lake Resources and Environments, Institute of Mineral Resources, CAGS, Beijing, 100037, China; State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing, 100029, China; Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining, 810008, China; Development and Research Center, China Geological Survey, Beijing, 100037, China
推荐引用方式 GB/T 7714	Lü Y.,Zhang H.,Li B.,et al. Late Mio-Pliocene landscape evolution around the Chaka Basin in the NE Tibetan Plateau: Insights from geochemical perspectives[J],2020,552.
APA	Lü Y.,Zhang H.,Li B.,&Jin Q..(2020).Late Mio-Pliocene landscape evolution around the Chaka Basin in the NE Tibetan Plateau: Insights from geochemical perspectives.Palaeogeography, Palaeoclimatology, Palaeoecology,552.
MLA	Lü Y.,et al."Late Mio-Pliocene landscape evolution around the Chaka Basin in the NE Tibetan Plateau: Insights from geochemical perspectives".Palaeogeography, Palaeoclimatology, Palaeoecology 552(2020).