| Magnetic properties of two soil profiles from Yan’an,Shaanxi Province and their implications for paleorainfall reconstruction |
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| 作者姓名： | LIU ZhiFeng & LIU QingSong |
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| 基金项目： | supported by the National Natural Science Foundation of China(Grant Nos.40125013 and 40821091);Q S Liu was supported by the 100-talent Program of the Chinese Academy of Sciences |
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| 摘 要： | The physical and chemical properties of soils are closely controlled by the climate factors and thus are significant for paleoclimate reconstruction.In this study,two adjacent soil profiles(LP and LPM) with different slopes from Yan'an,Shaanxi Province,were investigated using magnetic methods to determine the impact of topography on magnetic properties of soil.Our results show that although LP and LPM have similar magnetic minerals and grain size distribution,both the average and maximum magnetic susceptibility(x) of LP are almost doubled compared to those of LPM.In addition,the ratios of susceptibility enhancement to the background(Ex) for LP and LPM are 2.27 and 2.04,respectively;the ratios of saturation isothermal remnant magnetization(SIRM) enhancement(ESIRM) for these two profiles are 1.80 and 1.86,respectively.The slopes of the linear regression trends between frequency-dependent susceptibility(χFD) and "hard" isothermal remnant magnetization(HIRM)(χFD/HIRM),Anhysteretic remnant magnetization(ARM) and HIRM(ARM/HIRM),are almost free from the effect of parent material.χFD/HIRMs for LP and LPM are 28.7×10x5 and 28.9×10x5 A mx1,respectively;ARM/HIRMs are 0.35 and 0.33 for LP and LPM,respectively.These results demonstrate that parameters,χFD/HIRM,ARM/HIRM,Ex and ESIRM,are affected less by parent material and topography,which are better than the x for bulk samples to indicate the paleoclimatic conditions(e.g.,the paleorainfall) in a large-scale region.
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Magnetic properties of two soil profiles from Yan’an,Shaanxi Province and their implications for paleorainfall reconstruction |
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| LIU ZhiFeng & LIU QingSong.Magnetic properties of two soil profiles from Yan’an,Shaanxi Province and their implications for paleorainfall reconstruction[J].Science China Earth Sciences,2014,57(4):719-728. |
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| Authors: | ZhiFeng Liu QingSong Liu |
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| Institution: | 1. State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, 100029, China
2. Graduate University of Chinese Academy of Sciences, Beijing, 100049, China
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| Abstract: | The physical and chemical properties of soils are closely controlled by the climate factors and thus are significant for paleoclimate reconstruction. In this study, two adjacent soil profiles (LP and LPM) with different slopes from Yan’an, Shaanxi Province, were investigated using magnetic methods to determine the impact of topography on magnetic properties of soil. Our results show that although LP and LPM have similar magnetic minerals and grain size distribution, both the average and maximum magnetic susceptibility (χ) of LP are almost doubled compared to those of LPM. In addition, the ratios of susceptibility enhancement to the background (E χ ) for LP and LPM are 2.27 and 2.04, respectively; the ratios of saturation isothermal remnant magnetization (SIRM) enhancement (E SIRM) for these two profiles are 1.80 and 1.86, respectively. The slopes of the linear regression trends between frequency-dependent susceptibility (χ FD) and “hard” isothermal remnant magnetization (HIRM) (χ FD/HIRM), Anhysteretic remnant magnetization (ARM) and HIRM (ARM/HIRM), are almost free from the effect of parent material. χ FD/HIRMs for LP and LPM are 28.7×10?5 and 28.9×10?5 A m?1, respectively; ARM/HIRMs are 0.35 and 0.33 for LP and LPM, respectively. These results demonstrate that parameters, χ FD/HIRM, ARM/HIRM, E χ and E SIRM, are affected less by parent material and topography, which are better than the χ for bulk samples to indicate the paleoclimatic conditions (e.g., the paleorainfall) in a large-scale region. |
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| Keywords: | soil profile slope magnetic properties paleorainfall reconstruction |
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