Pronounced changes in paleo-wind direction and dust sources during MIS3b recorded in the Tacheng loess, northwest China

被引:21
作者
Cheng, Liangqing [1 ,2 ,3 ]
Song, Yougui [1 ,2 ]
Sun, Huanyu [1 ]
Bradak, Balazs [4 ,5 ]
Orozbaev, Rustam [6 ,7 ]
Zong, Xiulan [1 ,2 ,3 ]
Liu, Huifang [1 ]
机构
[1] Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian 710061, Peoples R China
[2] CAS Ctr Excellence Quaternary Sci & Global Change, Xian 710061, Peoples R China
[3] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
[4] Eotvos Lorand Univ, Dept Phys Geog, H-1117 Budapest, Hungary
[5] Kobe Univ, Res Ctr Inland Seas, Nada Ku, Kobe, Hyogo 6578501, Japan
[6] Natl Acad Sci Kyrgyz Republ, Inst Geol, Bishkek 720040, Kyrgyzstan
[7] Amer Univ Cent Asia, Appl Geol Dept, Bishkek 720060, Kyrgyzstan
关键词
Grain size; Anisotropy of magnetic susceptibility; Heavy mineral; Central Asia loess; Heinrich event; GRAIN-SIZE DISTRIBUTION; MAGNETIC-SUSCEPTIBILITY AMS; LATE QUATERNARY GLACIATION; BE-10 SURFACE EXPOSURE; CENTRAL-ASIA; ILI BASIN; TIAN-SHAN; PALEOCLIMATIC SIGNIFICANCE; ATMOSPHERIC CIRCULATION; PALAEOWIND DIRECTIONS;
D O I
10.1016/j.quaint.2019.05.002
中图分类号
P9 [自然地理学];
学科分类号
0705 ; 070501 ;
摘要
Central Asia loess deposits can yield detailed records of aridification across the Asian interior, as well as the atmospheric circulation. In this study, we presented grain size, heavy mineral assemblage, rock magnetism and anisotropy of magnetic susceptibility of a loess section in the Tacheng Basin in Xinjiang region, NW China. The results of anisotropy of magnetic susceptibility indicated that a near-surface SE wind prevailed in the Tacheng area since Marine Isotope Stage (MIS) 3, while a near-surface SW prevailing wind developed during MIS3b. We inferred that the change of wind direction was due to glacial advance during MIS3b. Combining the result of anisotropy of magnetic susceptibility with grain size, heavy mineral assemblage data and previously published low-field mass susceptibility revealed that dust transported by the near-surface SW wind had a greater ability to enhance magnetic susceptibility and higher amphibole/epidote ratio. Additionally, a strong Siberian High during Heinrich Event (H)5 at ca. 48 ka blocked the advection of moisture into the region via mid-latitude westerlies, causing glacial recession and the weakening of the prevailing SW wind. Our study has implications for identifying changes in paleo-wind direction and dust source, which can aid understanding of the influence of westerlies and the Siberian High on dust accumulation, as well as their interactions.
引用
收藏
页码:122 / 134
页数:13
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