气候变化领域集成服务门户(CCPortal): Heavy mineral assemblages and sedimentation rates of eastern Central Asian loess: Paleoenvironmental implications

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DOI	10.1016/j.palaeo.2020.109747
	Heavy mineral assemblages and sedimentation rates of eastern Central Asian loess: Paleoenvironmental implications
	Cheng L.; Song Y.; Chang H.; Li Y.; Orozbaev R.; Zeng M.; Liu H.
发表日期	2020
ISSN	0031-0182
卷号	551
英文摘要	Central Asian loess deposits record the evolution of aridification across the Asian interior. However, paleoclimatic proxies are strongly influenced by the variation of the dust source and accumulation process. In order to decipher the paleoenvironmental changes, a sensitive paleoclimatic proxy with clear source and accumulation process will be needed. In this study, heavy mineral assemblages and sedimentation rates were investigated in a 30-kyr loess section in the Ili Basin, Xinjiang, northwestern China. During Marine Isotope Stage (MIS) 2, trends in dust sedimentation rate were similar to those of the Chinese Loess Plateau (CLP), in anti-phase with Northern Hemisphere Summer Insolation (NHSI) at 65°N. Amphibole/epidote ratios (contents and mean grain size) were low during cold phases, such as the late Last Glacial Maximum (LGM) and Heinrich Event (H) 1; their ratios were higher during adjacent warm periods; this was attributed to aeolian sorting during transportation. Namely, greater sorting between amphibole and epidote occurred in warmer phases, and weaker sorting occurred in colder phases. The amphibole/epidote ratio could serve as a proxy for wind intensity, and thus the Siberian High (SH) intensity. Amphibole/epidote ratio was a more appropriate proxy to record wind intensity than dust sedimentation rate which was also influenced by sediment availability. A higher amphibole/epidote ratio corresponded to a more negative East Asian stalagmite δ18O, indicating an anti-phase relationship between the SH and East Asian Summer Monsoon (EASM) during the MIS 2. © 2020 Elsevier B.V.
英文关键词	Amphibole; East Asian Summer Monsoon; Epidote; Grain size; Siberian High
语种	英语
scopus关键词	amphibole; aridification; epidote; heavy mineral; insolation; Last Glacial Maximum; loess; Northern Hemisphere; paleoenvironment; proxy climate record; sedimentation rate; sorting; stalagmite; China; Ili Basin; Loess 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/150485
作者单位	State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, 710061, China; CAS Center for Excellence in Quaternary Science and Global Change, Xi'an, 710061, China; University of Chinese Academy of Sciences, Beijing, 100049, China; Qinghai Provincial K Laboratory of Geology and Environment of Salt Lake, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining, 810008, China; Institute of Geology, National Academy of Sciences of Kyrgyz Republic, Bishkek, 720040, Kyrgyzstan; Applied Geology Department, American University of Central Asia, Bishkek, 720060, Kyrgyzstan; College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua, 321004, China
推荐引用方式 GB/T 7714	Cheng L.,Song Y.,Chang H.,et al. Heavy mineral assemblages and sedimentation rates of eastern Central Asian loess: Paleoenvironmental implications[J],2020,551.
APA	Cheng L..,Song Y..,Chang H..,Li Y..,Orozbaev R..,...&Liu H..(2020).Heavy mineral assemblages and sedimentation rates of eastern Central Asian loess: Paleoenvironmental implications.Palaeogeography, Palaeoclimatology, Palaeoecology,551.
MLA	Cheng L.,et al."Heavy mineral assemblages and sedimentation rates of eastern Central Asian loess: Paleoenvironmental implications".Palaeogeography, Palaeoclimatology, Palaeoecology 551(2020).