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| The Coupling Relationship of Pathogenesis and East Asian Monsoon Variability since 18000 a BP in the Upper Reaches of Hanjiang River Valley of China |
| Bian Hongyan1, Pang Jiangli1, Huang Chunchang1, Zha Xiaochun1, Kong Wei2 |
1. College of Tourism and Environment Science, Shaanxi Normal University, Xi'an 710062, China;
2. College of Law and Politics, Hebei North University, Zhangjiakou 075000, Hebei, China |
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Abstract As the accumulation of dust storm, aeolian loess indicates the conversion of East Asian Summer Monsoon, which is necessary to explore the coupling relationship of the loess accumulation & pathogenesis characteristics and East Asian Monsoon variability. Pedogenic modification characteristics and the structure of soil profiles were observed in the field survey process in the Hanjiang River valley, and magnetic susceptibility,particle-size distribution, mineral assemblage, major elements trace and OSL age were analyzed in laboratory. The research tries to use loess-like as ancient inductor to induct the transformation of East Asian Monsoon. (1)The loess sediments profile structure is MS-L0-S0-Lt-L1-AD in the Hanjiang River valley. The pathogenesis strength's sequence shows S0>L0 /Lt>L1, the elements features (Al, Fe, Na, K, Si) are consistent with the Loess Plateau. (2)East Asian Monsoon and solar radiation exists a phase difference of 2000-3000.The East Asian Monsoon succession characteristic in northern subtropics was as following: strong winter wind(Last Glacial Maximum)→weak winter monsoon (early Holocene)→dominant summer monsoon (Mid-Holocene) →weak summer monsoon (the late Holocene) (3)Hanjiang River valley loess recorded cold and dry events happened during 5000-6000 a BP.
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Received: 23 July 2013
Published: 20 May 2014
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Corresponding Authors:
庞奖励（Email：jlpang@snnu.edu.cn）
E-mail: jlpang@snnu.edu.cn
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2014, Vol. 34 
