| 祁连山东段半干旱区黄土磁组构及其环境意义 |
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| 引用本文： | 王勇,潘保田,管清玉,GAO Hongshan,ZHANG Hui,LI Qiong,LIU Xiaofeng.祁连山东段半干旱区黄土磁组构及其环境意义[J].地理学报(英文版),2005,15(2):210-216. |
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| 作者姓名： | 王勇 潘保田 管清玉 GAO Hongshan ZHANG Hui LI Qiong LIU Xiaofeng |
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| 作者单位： | Key Laboratory of Western China's Environment System，MOE，College of Resource and Environment Science，Lanzhou University，Lanzhou 730000，China |
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| 摘 要： | 1 IntroductionM agnetic fabric is the basic character and the im portant trait for m agnetic m inerals insedim entary rocks.Ithas been w idely used in geologicaland environm entalinvestigations in thepastdecades (Ress,1965;Rolph,1989;Sagnotti,1998;Raposo,…
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| 关 键 词： | 环境变化 磁性岩组 秦岭山脉 古地质学 黄土沉积 |
| 收稿时间： | 10 November 2004 |
Paleoenvironmental significance investigation of loess magnetic fabric in a semiarid region |
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| Yong Wang,Baotian Pan,Qingyu Guan,Hongshan Gao,Hui Zhang,Qiong Li,Xiaofeng Liu.Paleoenvironmental significance investigation of loess magnetic fabric in a semiarid region[J].Journal of Geographical Sciences,2005,15(2):210-216. |
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| Authors: | Yong Wang Baotian Pan Qingyu Guan Hongshan Gao Hui Zhang Qiong Li Xiaofeng Liu |
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| Institution: | Key Laboratory of Western China's Environment System, MOE, College of Resource and Environment Science, Lanzhou University, Lanzhou 730000, China;Key Laboratory of Western China's Environment System, MOE, College of Resource and Environment Science, Lanzhou University, Lanzhou 730000, China;Key Laboratory of Western China's Environment System, MOE, College of Resource and Environment Science, Lanzhou University, Lanzhou 730000, China;Key Laboratory of Western China's Environment System, MOE, College of Resource and Environment Science, Lanzhou University, Lanzhou 730000, China;Key Laboratory of Western China's Environment System, MOE, College of Resource and Environment Science, Lanzhou University, Lanzhou 730000, China;Key Laboratory of Western China's Environment System, MOE, College of Resource and Environment Science, Lanzhou University, Lanzhou 730000, China;Key Laboratory of Western China's Environment System, MOE, College of Resource and Environment Science, Lanzhou University, Lanzhou 730000, China |
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| Abstract: | Here we report our recent magnetic fabric investigation of loess deposition in Shagou section, located at the northeastern Qilian Mountains, the northeastern rim of the Tibetan Plateau. On the basis of environmental magnetism data, we indicate that the variation of anisotropy of magnetic susceptibility (AMS) parameters, especially the foliation (F) and degree of anisotropy (P), might be more sensitive to the environmental change in the arid and semiarid regions than the magnetic susceptibility fluctuation. During the investigated interval, from 0.83 to 0.128 Ma, most of the middle to late Pleistocene significant climate change can be unraveled by the AMS parameters, such as the strengthening of cold/dry climate, the step drying event occurred nearly 250 ka, and the severe environmental change in MIS16. Our results also suggest that there is strong correlation between median diameter (Md) of grain size, F, and P. We propose that the AMS parameters can act as an important paleoenvironmental change indicator in the arid and semiarid regions. |
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| Keywords: | magnetic fabric environmental variation Qilian Mountains |
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