The Magnetic Properties of Topsoil from the Edge of Tengger Desert, and Its Environmental Significance
详细信息
- 责任者：Li Pingyuan (Key Laboratory of Western China’s Environmental Systems ; Ministry of Education ; Research School of Arid Environment & Climate Change ; Lanzhou University ; Lanzhou 730000 ; China) ; Liu Xiuming
- 刊名：Quaternary Sciences
- 出版年：2012
- 卷期：32(4)
- 关键词：黄土 ; loess ; 古气候 ; paleoclimate ; 环境磁学 ; environmental magnetism ; 甘肃 ; Gansu Province
- 页码：p.771-776
- 图表：3 illus., 67 refs.
- 分类号：1400
- issnNo：ISSN1001-7410
- isbnNo：CN11-2708/P
摘要
Based on systematical analysis on rock magnetism,this paper studies the topsoil from the edge of Tengger Desert in Northwestern China.The measured magnetic parameters indicate that main magnetic minerals of those topsoil is magnetite,the other may have maghemite and hematite.The grain size of magnetic minerals is coarse,mostly within range of multi-domain.The magnetic susceptibility has little relation with the pedogenesis but closely relates with landform and parent materials.The topsoils from such arid area or aeolian dust,show similar magnetic mineralogy between them,and do not undergo clearly pedogenesis.Their enhancement mechanism of magnetic susceptibility differs from that in the Loess Plateau.The magnetic susceptibility in such dried region indicates information of parent material,landform and microclimate,instead of pedogenesis.
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