Heavy mineral assemblages and sedimentation rates of eastern Central Asian loess  Paleoenvironmental implications

doi:10.1016/j.palaeo.2020.109747

ISL OpenIR > 盐湖地质与环境实验室

	Heavy mineral assemblages and sedimentation rates of eastern Central Asian loess Paleoenvironmental implications
	Cheng, Liangqing; Song, Yougui; Chang, Hong; Li, Yun; Orozbaev, Rustam; Zeng, Mengxiu; Liu, Huifang
第一作者	Cheng, Liangqing
	2020-08-01
发表期刊	PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
ISSN	0031-0182
卷号	551
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 degrees 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 delta O-18, indicating an anti-phase relationship between the SH and East Asian Summer Monsoon (EASM) during the MIS 2.
DOI	10.1016/j.palaeo.2020.109747
引用统计
文献类型	期刊论文
条目标识符	http://ir.isl.ac.cn/handle/363002/33985
专题	盐湖地质与环境实验室中国科学院青海盐湖研究所
推荐引用方式 GB/T 7714	Cheng, Liangqing,Song, Yougui,Chang, Hong,et al. Heavy mineral assemblages and sedimentation rates of eastern Central Asian loess Paleoenvironmental implications[J]. PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,2020,551.
APA	Cheng, Liangqing.,Song, Yougui.,Chang, Hong.,Li, Yun.,Orozbaev, Rustam.,...&Liu, Huifang.(2020).Heavy mineral assemblages and sedimentation rates of eastern Central Asian loess Paleoenvironmental implications.PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,551.
MLA	Cheng, Liangqing,et al."Heavy mineral assemblages and sedimentation rates of eastern Central Asian loess Paleoenvironmental implications".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 551(2020).

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