Magnetostratigraphy and palaeoclimate of Red Clay sequences from Chinese Loess Plateau |
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| Authors: | Donghuai Sun Dongsheng Liu Mingyang Chen Zhisheng An Shaw John |
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| Institution: | (1) Xi’an Laboratory of Loess and Quaternary Geology, Chinese Academy of Sciences, 710054 Xi’an, China;(2) Geomagnetism Laboratory, University of Liverpool, L69 7ZE Liverpool, UK;(3) Institute of Geology, Chinese Academy of Sciences, 100029 Beijing, China |
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| Abstract: | Two Red Clay profiles near Xi’an and Xifeng were investigated in an attempt to determine magnetostratigraphic and palaeoclimatic
records. The results show that aeolian dust accumulation and the related East Asia palaeomonsoon system had begun by 6.5 Ma,
and it is deduced that the Tibetan Plateau had reached a significant elevation at that time. The late Tertiary palaeoclimatic
history of the Red Clay as reflected by magnetic susceptibility is reconstructed during the period of 6.5–2.5 Ma. Stepwise
increase in susceptibility of aeolian dust accumulation appears to have a close correlation to the uplift processes of the
Tibetan Plateau. The remarkable increase of aeolian dust accumulation at 3.2 Ma appears to be due to the influence of global
ice volume on the East Asia monsoon. Palaeomonsoon variation during the late Tertiary as recorded in the Red Clay sequences
from the Chinese Loess Plateau can be regarded as the product of a number of interacting factors, such as uplift of the Tibetan
Plateau, solar radiation, global ice volume, etc.
Project supported by the National Natural Science Foundation of China and the Foundation of Xi’an Laboratory of Loess and
Quaternary Geology, Chinese Academy of Sciences. |
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| Keywords: | magnetostratigraphy of Red Clay aeolian dust accumulation monsoon variation uplift of Tibetan Plateau |
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