气候变化领域集成服务门户(CCPortal): Changes of provenance of loess deposits in Nyingchi, southeastern Tibetan Plateau: Implications for paleoclimates since the last glacial

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DOI	10.1016/j.jseaes.2023.105951
	Changes of provenance of loess deposits in Nyingchi, southeastern Tibetan Plateau: Implications for paleoclimates since the last glacial
	Zhou, Jianchao; Wu, Jinglu; Zhang, Hongliang
发表日期	2024
ISSN	1367-9120
EISSN	1878-5786
卷号	260
英文摘要	Paleoenvironmental conditions on the southeastern Tibetan Plateau (TP) during the last glacial period are still unclear. Here, we present a loess record (LZP) in the Yarlung Zangbo River (YZR) valley of the southeastern TP, extending over the past 33 ka. Based on grain size, magnetic susceptibility, major and trace elements, sources of loess during different periods were discriminated. Combined with bulk biogeochemical properties (TOC and delta 13Corg), as well as comparisons to regional paleoclimate records, the paleoclimate and environmental impli-cations of the LZP loess were further revealed. During 33.4-24.5 ka and 8.4-0.5 ka, loess deposits were mainly derived from nearby river valley while undergoing a relatively strong Indian summer monsoon (ISM). The period of 24.5-15.4 ka witnessed a notable decrease in the contribution of nearby sources and an increase in the contribution of distant materials. The dramatic changes in loess provenance may be due to the development of a paleo-dammed lake in the YZR valley, coupled with the impact of a weak ISM. The sediment contribution of nearby sources increased during 15.4-8.4 ka due to shrinkage or disappearance of the paleo-dammed lake and enhanced ISM. Furthermore, four warmer and wetter events occurred at 31-29 ka, 26.8-25 ka, 22.3-21 ka and 15.5-14 ka were revealed by the LZP record and correspond to enhanced ISM. Our research indicates the complex responses of loess deposits in the southeastern TP to global climate change and local environmental events.
关键词	Loess Provenance Indian summer monsoon Paleo-dammed lake Southeastern Tibetan Plateau
英文关键词	AREA SOUTHERN TIBET; INDIAN MONSOON; LATE QUATERNARY; ORGANIC-CARBON; CLIMATE; CHINA; AGE; PRECIPITATION; VARIABILITY; DELTA-O-18
WOS研究方向	Geosciences, Multidisciplinary
WOS记录号	WOS:001134104500001
来源期刊	JOURNAL OF ASIAN EARTH SCIENCES
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/283863
作者单位	Chongqing Technology & Business University; Chinese Academy of Sciences; Nanjing Institute of Geography & Limnology, CAS
推荐引用方式 GB/T 7714	Zhou, Jianchao,Wu, Jinglu,Zhang, Hongliang. Changes of provenance of loess deposits in Nyingchi, southeastern Tibetan Plateau: Implications for paleoclimates since the last glacial[J],2024,260.
APA	Zhou, Jianchao,Wu, Jinglu,&Zhang, Hongliang.(2024).Changes of provenance of loess deposits in Nyingchi, southeastern Tibetan Plateau: Implications for paleoclimates since the last glacial.JOURNAL OF ASIAN EARTH SCIENCES,260.
MLA	Zhou, Jianchao,et al."Changes of provenance of loess deposits in Nyingchi, southeastern Tibetan Plateau: Implications for paleoclimates since the last glacial".JOURNAL OF ASIAN EARTH SCIENCES 260(2024).