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《Acta Sedimentologica Sinica》 2008-06
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Magnetic Properties of Loess Deposit in Eastern Qinling Mountains and An Investigation on the Magnetic Susceptibility Enhancement

ZHAO Jun1, 2, 5LU Hua-yu2 WANG Xiao-yong3ZHANG Hong-yan1,2,5WANG She-jiang4(1.SKLLQG, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710075;2.School of Geographic and Oceanographic Sciences, Nanjing University, Nanjing 210093;3.School of Resources and Environment, Eastern China Normal University, Shanghai 200062; 4.Archaeology Program, School of Historical and European Studies, La Trobe University, Victoria 3086, Australia;5.Graduate School of the Chinese Academy of Sciences, Beijing 100049)  
We have carried out a relatively complete rock magnetism investigation on loess deposit in the eastern Qinling Mountains, central China. 251 and 341 samples were obtained from Shangbaichuan (SBC) and Erlongshan (ELS) loess-paleosol sections at 10 cm and 5cm intervals, respectively. Magnetic susceptibility was measured on all these samples. Isothermal Remanent Magnetization (IRM) and Anhysteretic Remanent Magnetization(ARM) were measured on 24, 26 and 6 samples selected from SBC, ELS and Liuwan (LW) sections, respectively. The thermal properties and hysteresis properties were measured on 14, 14 and 6 samples from SBC, ELS and LW sections. The results indicate that most of loess and paleosol samples are dominated by ferrimagnetic minerals (magnetite and maghemites) and the paleosols have more ferrimagnetic minerals than that in the loess, but there are still some cases that antiferromagnetic minerals (hematite) play a more important role in the magnetic properties. Both of the concentration of ferrimagnetic minerals and antiferromagnetic minerals systematically increase with the intensified degree of pedogenesis. The fine-grained ferrimagnetic minerals, which were formed in pedogenesis, are dominated by single domain and/or pseudo-single domain grains which contribute significantly to the magnetic susceptibility enhancement. The results reveal a strong linkage between the magnetic properties and the palaeoclimate. The rock magnetic properties of the three loess-paleosol sections are generally similar to that in the Loess Plateau, but with a minor difference. In addition, the rock magnetic properties among the three loess-paleosol sequences are slightly different; this may be caused by a warmer and more humid climate in this region.
【Fund】: 澳大利亚研究理事会基金项目(ARC编号:DP0665250);; 南京大学211工程项目;; 教育部引智计划项目(111)联合资助
【CateGory Index】: P318.4
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