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萧县黄土剖面的磁化率测量及意义 被引量:3
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作者 许峰宇 钱刚 《江苏师范大学学报(自然科学版)》 CAS 1996年第3期51-54,共4页
新近发现的萧县黄土剖面是关于淮河北部地区黄土堆积的初次报导.野外观察表明,该剖面可划分为4层古土壤和4层黄土.对该剖面磁化率测量表明,该剖面的磁化率曲线与古土壤一黄土系列有着高度的一致性.9个磁化率阶段的划分,说明磁... 新近发现的萧县黄土剖面是关于淮河北部地区黄土堆积的初次报导.野外观察表明,该剖面可划分为4层古土壤和4层黄土.对该剖面磁化率测量表明,该剖面的磁化率曲线与古土壤一黄土系列有着高度的一致性.9个磁化率阶段的划分,说明磁化率测量比野外观察更能反映物质组成和古气候的细微变化.磁化率曲线峰谷变化的特征暗示该剖面堆积过程中气候转型事件的存在,这一剖面的的发现,填补了淮河中下游地区缺少黄土堆积的空白. 展开更多
关键词 萧县 黄土 古土壤 剖面磁化率
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Magnetic properties of two soil profiles from Yan'an,Shaanxi Province and their implications for paleorainfall reconstruction 被引量:1
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作者 LIU ZhiFeng LIU QingSong 《Science China Earth Sciences》 SCIE EI CAS 2014年第4期719-728,共10页
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 diffe... 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 Yah'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 max- imum magnetic susceptibility (Z) of LP are almost doubled compared to those of LPM. In addition, the ratios of susceptibility enhancement to the background (Ez) for LP and LPM are 2.27 and 2.04, respectively; the ratios of saturation isothermal rem- nant 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 (ZFD) and "hard" isothermal remnant magnetization (HIRM) (ZFD/HIRM), Anhysteretic remnant magnetization (ARM) and HIRM (ARM/HIRM), are almost free from the effect of parent material. XFD/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, ZFD/HIRM, ARM/HIRM, Ez and ESIRM, are affected less by parent material and topography, which are better than the Z for bulk samples to indicate the paleoclimatic conditions (e.g., the paleorainfall) in a large-scale region. 展开更多
关键词 soil profile SLOPE magnetic properties paleorainfall reconstruction
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