Climatic Change Since the Late Miocene in West China: Evidence from Anion Chlorine in the Linxia Red Basin

Xi Xiaoxia; Mu Defen; Fang Xiaomin; Li Jijun

Anion Chlorine in inland lakes is a commonindicator highly sensitive to climatic change. The variation of the content of anion chlorime in the Late Cenozoic stratigraphy in the Linxia Basim, Gansu Province, China, demonstrates that climate changes clearly in phase (step) and periodicity. The climate was shited rapidly at about 6.3 Ma from relatively humid to very dry environments, and reached an extreme dry environment between 5.3 Ma and 4.5 Ma, with drought degree 33 times the early Quaternary. In low frequency, climate presents ca. 400 ka periodicity of dry-humid fluctuation, matching global hot-cold (cool) fluctuation in similar periodicity in the Late Miocene-Early Pliocene; w hile matching global cold-warm fluctuation in the early Quaternary. The change of moistureheat regime from the Late Pliocene to the early Quaternary may suggest that the Asian monsoon system began to form gradually since the Late Pliocene and was completely established in the esrly Quaternary. The strong whole uplift of the Tibetan plateau at ca. 3.4 Ma may be responsible for such change.

1. Department of Atmospheric Sciences, Lanzhou University, Lanzhou 730000;

2. Department of Geography, Lanzhou University, Lanzhou 730000

Received Date: 1996-06-15

Rev Recd Date: 1997-06-15

Publish Date: 1998-06-10

Key words:

Abstract: Anion Chlorine in inland lakes is a commonindicator highly sensitive to climatic change. The variation of the content of anion chlorime in the Late Cenozoic stratigraphy in the Linxia Basim, Gansu Province, China, demonstrates that climate changes clearly in phase (step) and periodicity. The climate was shited rapidly at about 6.3 Ma from relatively humid to very dry environments, and reached an extreme dry environment between 5.3 Ma and 4.5 Ma, with drought degree 33 times the early Quaternary. In low frequency, climate presents ca. 400 ka periodicity of dry-humid fluctuation, matching global hot-cold (cool) fluctuation in similar periodicity in the Late Miocene-Early Pliocene; w hile matching global cold-warm fluctuation in the early Quaternary. The change of moistureheat regime from the Late Pliocene to the early Quaternary may suggest that the Asian monsoon system began to form gradually since the Late Pliocene and was completely established in the esrly Quaternary. The strong whole uplift of the Tibetan plateau at ca. 3.4 Ma may be responsible for such change.

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Climatic Change Since the Late Miocene in West China: Evidence from Anion Chlorine in the Linxia Red Basin

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