Environmental evolution since 230 ka BP recorded by Fengning loess section in Bashang area of Hebei Province
Mao Xin1,2, Liu Linjing1,2, Li Changan3, Jiang Gaolei1,2, Zhang Yufen4, Zhao Hongmei1,2, Bi Zhiwei1,2
1 Institute of Hydrogeology and Environmental Geology,Chinese Academy of Geological Sciences,Shijiazhuang 050061,Hebei; 2 Key Laboratory of Quaternary Chronology and Hydrological Environment Evolution, CAGS, Shijiazhuang 050061, Hebei; 3 School of Earth Sciences,China University of Geosciences,Wuhan 430074,Hubei; 4 Institute of Geophysics & Geomatics,China University of Geosciences,Wuhan 430074,Hubei
Abstract Bashang area of Hebei Province,located in the peripheral region of the East Asian Monsoon,is sensitive to climate change. The Fengning loess section provides ideal materials for studying long-time environmental changes in this region. Combined with OSL dating results,elemental concentrations and magnetic susceptibility were determined to obtain the record of environmental evolution since 230 ka BP. Based on identification of weathering and leaching loess under S1 in the field,we also discussed weathering features in S1 paleosol and the relevant climate change. The results showed that:(1)Magnetic susceptibility record of the Fengning loess section coincided with marine isotope stage 3-8 perfectly,that indicated that the study area had given a sensitive response to globe palaeoclimatic changes since 230 ka BP;(2)Due to the impact of heavy rainfall in the period of S1 paleosol development, elements were strongly leached and migrated downward to L2 loess,resulting in the difference between geochemical records and magnetic susceptibility in the upper of L2 loess;(3)The Layer from S1 paleosol to calcrete belongs to acidic leached soil type that can be equivalent to yellow-brown soil developed at modern northern subtropics, and is consist of soil layer,weathered and leached loess layer and CaCO3 illuvium; (4)The temperature and precipitation in the period of S1 paleosol development were quite similar to those in Sihong area and Liuhe area of Jiangsu Province,that indicated that the climate of the study area was subtropical during the forming period of S1 paleosol.
Fund:Co-funded by the Basic Research Program of Chinese Academy of Geological Sciences(No; YWF201411) and the National Natural Science Foundation of China(No.41602194)
Corresponding Authors:
Liu Linjing,born in 1982,is a research associate of Institute of Hydrogeology and Environmental Geology,Chinese Academy of Geological Sciences. He is mainly engaged in researches on Quaternary geology and environmental evolution. E-mail: liulj206@126.com.
About author: Mao Xin,born in 1989,is a research assistant of Institute of Hydrogeology and Environmental Geology,Chinese Academy of Geological Sciences. He is mainly engaged in research on Quaternary environmental evolution. E-mail: maoxin.iheg@hotmail.com.
Cite this article:
Mao Xin,Liu Linjing,Li Changan et al. Environmental evolution since 230 ka BP recorded by Fengning loess section in Bashang area of Hebei Province[J]. JOPC, 2017, 19(4): 745-756.
Mao Xin,Liu Linjing,Li Changan et al. Environmental evolution since 230 ka BP recorded by Fengning loess section in Bashang area of Hebei Province[J]. JOPC, 2017, 19(4): 745-756.
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