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天山黄土区与黄土高原表土磁性特征对比及环境意义
引用本文:郭雪莲,刘秀铭,吕镔,汤德平,毛学刚,陈家胜,陈晓耀.天山黄土区与黄土高原表土磁性特征对比及环境意义[J].地球物理学报,2011,54(7):1854-1862.
作者姓名:郭雪莲  刘秀铭  吕镔  汤德平  毛学刚  陈家胜  陈晓耀
作者单位:1. 兰州大学西部环境教育部重点实验室,兰州 730000; 2. 兰州大学资源环境学院,兰州 730000; 3. Department of Environment and Geography, Macquarie University, NSW 2109 Australia; 4. 福州大学紫金矿业学院,福州 350108
基金项目:国家自然科学基金,国家创新研究群体科学基金,中央高校基本科研业务费专项资金项目,甘肃省自然科学基金
摘    要:本文对黄土高原和天山黄土区表土进行系统的岩石磁学和粒度测试分析,探讨了表土磁性特征及其环境意义,结果表明表土中的强磁性矿物均为磁铁矿和磁赤铁矿,弱磁性矿物为赤铁矿和纤铁矿或针铁矿,黄土高原黄土地层中的磁赤铁矿至少有部分属于风积成因.黄土高原表土中磁化率与频率磁化率呈良好的正相关,气候作用是主导黄土高原表上磁化率增强的主...

关 键 词:表土  磁学性质  磁化率  天山黄土区  黄上高原
收稿时间:2010-12-28

Comparison of topsoil magnetic properties between the loess region in Tianshan Mountains and Loess Plateau, China, and its environmental significance
GUO Xue-Lian,LIU Xiu-Ming,L Bin,TANG De-Ping,MAO Xue-Gang,CHEN Jia-Sheng,CHEN Xiao Yao.Comparison of topsoil magnetic properties between the loess region in Tianshan Mountains and Loess Plateau, China, and its environmental significance[J].Chinese Journal of Geophysics,2011,54(7):1854-1862.
Authors:GUO Xue-Lian  LIU Xiu-Ming  L Bin  TANG De-Ping  MAO Xue-Gang  CHEN Jia-Sheng  CHEN Xiao Yao
Institution:1. Key Laboratory of Western China's Environmental Systems, Ministry of Education of China, Lanzhou University, Lanzhou 730000, China; 2. College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000,China; 3. Department of Environment and Geography, Macquarie University, NSW 2109, Australia; 4. College of Zijin Mining, Fuzhou University, Fuzhou 350108,China
Abstract:Based on systematic analysis on rock magnetism and grain size, this paper studies the topsoils of the loess region of Tianshan Mountains and the Loess Plateau in northwestern China. Their magnetic characteristics indicate that the main magnetic minerals of these topsoils are magnetite, maghemite, hematite and lepidocrocite or goethite. The grain size of magnetic minerals in Tianshan topsoils is generally much coarser; mostly within range of multi-domain (MD). Hard magnetic minerals in Tianshan topsoils are higher than that of Loess Plateau. The magnetic susceptibility of topsoils from Loess Plateau shows a good positive relation with frequency dependent susceptibility. Climate condition, such as temperature and precipitation, especially the latter one, is considered as the major factor effecting susceptibility enhancement in the Loess Plateau. Tianshan topsoil contains a very small amount of ultrafine magnetic grains produced during pedogenesis, which has very limited contribution to the susceptibility enhancement. Tianshan topsoils generally show a characteristic of less weathering or weak pedogenesis, aeolian coarser grains, therefore play an important role in mechanism of magnetic susceptibility enhancement. Frequency dependent susceptibility shows a close relation with mean annual precipitation (MAP) in all studied areas. However magnetic susceptibility demonstrates difference with MAP in various regions: showing positive correlation in the central Loess Plateau (studied area); but negative relation with MAP in Tianshan area. Therefore, great care should be taken when explaining environments using magnetic susceptibility values from different regions.
Keywords:Topsoil  Magnetic property  Magnetic susceptibility  Loess in Tianshan Mountains  Loess Plateau
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