黄土高原东部（山西阳曲）1.2 Ma以来黄土记录的两次显著干旱化事件

毛永栋; 王治祥; 庞志斌

doi:10.3799/dqkx.2019.278

Volume 46 Issue 1

Jan. 2021

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Article Navigation > Earth Science > 2021 > 46(1): 272-280

Mao Yongdong, Wang Zhixiang, Pang Zhibin, 2021. Two Significant Stages in the Aridification of the Eastern Chinese Loess Plateau since 1.2 Ma. Earth Science, 46(1): 272-280. doi: 10.3799/dqkx.2019.278

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Mao Yongdong, Wang Zhixiang, Pang Zhibin, 2021. Two Significant Stages in the Aridification of the Eastern Chinese Loess Plateau since 1.2 Ma. Earth Science, 46(1): 272-280. doi: 10.3799/dqkx.2019.278

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Two Significant Stages in the Aridification of the Eastern Chinese Loess Plateau since 1.2 Ma

doi: 10.3799/dqkx.2019.278

Mao Yongdong^{1
,
,},
Wang Zhixiang^{2
,
,
,},
Pang Zhibin¹

1.
Shanxi Geological Survey Institute, Taiyuan 030000, China
2.
School of Earth Sciences, China University of Geosciences, Wuhan 430074, China

Received Date: 2019-11-14
Publish Date: 2021-01-15

Abstract

Abstract

Reconstruction of the progressive drying and expansion of deserts in eastern Asia during the Quaternary period is important for understanding the evolution of East Asian winter monsoon. The eolian deposits preserved in the Chinese Loess Plateau (CLP) are an unparalleled record of major wet/dry oscillations superimposed on the general drying trend of the Gobi and other nearby deserts of inland Asia. The element concentrations of these loess deposits in the Yangqu section in the eastern Loess Plateau indicate two major stages in the general aridification since 1.2 Ma. The first major step in aridification occurred at 0.94 Ma as indicated by an abrupt decrease of Si, Fe and Rb/Sr proportions and a significant increase of Ca content. We consider that the dominant factor for this drying step in eastern Loess Plateau was the increase of global ice volume, especially of Northern Hemisphere ice sheets, which force the Intertropical Convergence Zone to shift southward and inhibit the northward movement of moisture monsoon airflows. The second stage toward present aridification occurred at about 0.31 Ma. This step may be a localized regional event, perhaps attributed to the breach of Xin-Ding paleolake.
- Loess Plateau,
- Yangqu,
- oxygen isotopic composition,
- aridification,
- paleoclimatology

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References(43)

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