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《Arid Land Geography》 2011-01
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Magnetic property and its dominant fact of loess strata in western Tianshan area recorded by Kansu section

JIA Jia1,LIU Xian-bin1,XIA Dun-sheng1,2,WEI Hai-tao1,WANG Bo1(1 Key Laboratory of West China's Environmental Systems(Ministry of Education),College of Earth Sciences and Environments,Lanzhou University,Lanzhou 730000,Gansu,China;2 Key Laboratory of Desert and Desertification,Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Science,Lanzhou 730000,Gansu,China)  
For depositing and accumulating thick loess and paleosol sequences and distributing widely in the continents,the loess sediment is treated as one of the best paleoclimatic indicators.The magnetic susceptibility(χlf) of loess and paleosol sequences in China has been recognized and widely used as a proxy paleoclimatic indicator since Heller and Liu recognized its variation in loess and soil.It shows that the higher χlf values occurred in soil layers and the lower χlf values occurred in loess layers,what is more,the χlf values basically shows a positive relationship with intensity of pedogenesis which also has been discovered in some studies of loess sediments distributed in Europe and Central Asia.As research developing,the works have focused more attention on mechanism of magnetic susceptibility enhancement,leading to many hypotheses being brought out.As many evidences support,the pedogenesis enhancement has widely been accepted.The different phenomenon has been discovered in the Ili loess which shows a negative relationship between χlf values and intensity of pedogenesis.It has given us much interest to do more research work on the Ili loess.The Ili basin is located in the west of Xinjiang,where the climate is dominated by the prevailing westerly atmospheric circulation and local circulation.Previous researches have indicated the differences between the loesses deposited in Ili basin and Loess Plateau.For this reason,this study made more research on magnetic property of the Ili loess.The Kansu profile chosen for a research object is located in the east of the Ili basin where distributes typical loess sediments.The results show the magnetic property of Kansu loess is dominated by ferrimagnetic mineral,such as magnetite and maghemite.Antiferromagnetic and superparamagnetic minerals are also familiar,but make a less infection to magnetic susceptibility.Contrasting with the typical loess sediment of the central Loess Plateau,the stratum of Kansu profile contains more magnetic minerals and hard magnetic minerals.The analysis of grain size of magnetic minerals indicates that the property of the loess and paleosol is separately dominated by PSD/MD and coarse SSD magnetite.The research find that the density of magnetic mineral is similar in the loess and paleosol sequences on Kansu profile,but their relative proportion of fine grained magnetite and soft magnetic mineral is of difference,which shows a positive relationship between value of magnetic susceptibility and intensity of pedogenesis.
【Fund】: 973项目(2009CB421308);; 国家自然科学基金项目(批准号:40871080和90502008)资助
【CateGory Index】: P642.114
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