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

文献类型：期刊论文

作者Cheng, Liangqing1,3,4; Song, Yougui3,4; Chang, Hong3,4; Li, Yun7; Orozbaev, Rustam5,6; Zeng, Mengxiu2; Liu, Huifang3
刊名PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
出版日期2020-08-01
卷号551页码:12
ISSN号0031-0182
关键词Amphibole Epidote Grain size Siberian High East Asian Summer Monsoon
DOI10.1016/j.palaeo.2020.109747
通讯作者Song, Yougui(ygsong@loess.llqg.ac.cn)
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 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.
WOS关键词GRAIN-SIZE DISTRIBUTION ; LAST GLACIAL MAXIMUM ; CHINESE LOESS ; PALEOSOL SEQUENCE ; YELLOW-RIVER ; ENVIRONMENTAL-CHANGES ; TIBETAN PLATEAU ; TIEN-SHAN ; ILI BASIN ; MIS 2
资助项目National Basic Research Program of China[2016YFA0601902] ; Strategic Priority Research Program of Chinese Academy of Sciences[XDB40000000] ; Strategic Priority Research Program of Chinese Academy of Sciences[XDB26000000] ; Natural Science Foundation of China[41977385] ; Second Tibetan Plateau Scientific Expedition and Research program[2019QZKK0101]
WOS研究方向Physical Geography ; Geology ; Paleontology
语种英语
出版者ELSEVIER
WOS记录号WOS:000537682600007
资助机构National Basic Research Program of China ; Strategic Priority Research Program of Chinese Academy of Sciences ; Natural Science Foundation of China ; Second Tibetan Plateau Scientific Expedition and Research program
源URL[http://ir.ieecas.cn/handle/361006/14856]  
专题地球环境研究所_古环境研究室
第四纪科学与全球变化卓越创新中心
通讯作者Song, Yougui
作者单位1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
2.Zhejiang Normal Univ, Coll Geog & Environm Sci, Jinhua 321004, Zhejiang, Peoples R China
3.Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian 710061, Peoples R China
4.CAS Ctr Excellence Quaternary Sci & Global Change, Xian 710061, Peoples R China
5.Amer Univ Cent Asia, Appl Geol Dept, Bishkek 720060, Kyrgyzstan
6.Natl Acad Sci Kyrgyz Republ, Inst Geol, Bishkek 720040, Kyrgyzstan
7.Chinese Acad Sci, Qinghai Inst Salt Lakes, Qinghai Prov Key Lab Geol & Environm Salt Lake, Xining 810008, Qinghai, Peoples R China
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,2020,551:12.
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,551,12.
MLA Cheng, Liangqing,et al."Heavy mineral assemblages and sedimentation rates of eastern Central Asian loess: Paleoenvironmental implications".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 551(2020):12.

入库方式： OAI收割

来源：地球环境研究所

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