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Susceptibility variations of multiple origins of loess from the Ily Basin (NW China)

ISSN号：1001-6538
期刊名称：Chinese Science Bulletin
时间：0
页码：1844-1855
分类：P532[天文地球—古生物学与地层学;天文地球—地质学] P642.131[天文地球—工程地质学;天文地球—地质矿产勘探;天文地球—地质学]
作者机构：[1]Key Laboratory of Western China's Environmental Systems, Lanzhou University, Lanzhou 730000, China, [2]Institute of Geophysics, ETHZ, CH-8092, Switzerland, [3]School of Geographical Sciences, Fujian Normal University, Fuzhou 350007, China, [4]Department of Environment and Geography, Macquarie University, Sydney NSW 2109, Australia
相关基金：We thank Dr. Alexey Yurievich Kazansky and Dr. Galina Gel＇evna Matasova for constructive discussions and two reviewers＇ for their helpful comments and suggestions. We also thank Dr. Liu Jinfeng for conducting the OSL dating. This work was supported by the National Natural Science Founda- tion of China （40830105, 40772109, 40721061） and the China Scholarship Council.
相关项目：世界各地黄土磁化率与古气候不同关系机制以及古气候重建问题系统研究

关键词：中国西北地区, 磁化率, 黄土, 盆地, 铁磁性矿物, 颗粒尺寸分布, 成土作用, 土壤发生学, magnetic susceptibility, magnetic depletion and enhancement, loess, Ily Basin, environmental magnetism

中文摘要：

从 Ily 盆的黄土的磁性的危险性，西北的中国在 S0 paleosols 显示出最大的价值，但是最小在另外的 paleosols，其机制好珍视辩论。在这个工作，系统的磁性的大小用 Neleke 县在代表性的节上被做。结果证明黄土地平线( L1 ， L2 和 L3 )有风神的起源的多域磁铁矿谷物， S0 被 pedogenetic 的生产描绘极其细小颗粒的 ferrimagnetic 矿物质，和另外的 paleosols ( S1 ， S2 ，并且 S3 )被与 waterlogging 联系的 nonferrimagnetic 矿物质的形成描绘。在亚铁磁性材料，高顺磁的内容，高磁性的 coercivity 顽磁，好 ferrimagnetic 谷物尺寸和加强的成土作用的低集中之间的关联在更低的 paleosols 建议 pedogenetic 改进和 pedogenetic 弄空的二个竞争过程。Pedogenetic 弄空统治并且为低危险性负责。在磁性的谷物尺寸分发的变化发生在 pedogenetic 弄空期间。危险性变化具有在 Ily 盆的黄土的多重起源。磁性的矿物质的 Pedogenetic 改进， pedogenetic 弄空，和属曾被地壳动力搬的输入都应该被考虑解释磁性的参数的变化。

英文摘要：

The magnetic susceptibility of loess from the Ily Basin, northwestern China shows maximum values in SO paleosols but minimum values in other paleosols, the mechanism of which has been well debated. In this work, systematic magnetic measurements were made on a representative section from Neleke county. The results show that the loess horizons （L1, L2 and L3） have multi-domain magnetite grains of aeolian origin, SO is characterized by production of pedogenetic ultrafine-grained ferrimagnetic minerals, and the other paleosols （S 1, $2, and $3） are characterized by the formation of nonferrimagnetic minerals associated with waterlogging. The correlation between the low concentration of ferrimagnets, high paramagnetic content, high magnetic coercivity remanence, fine ferrimagnetic grain size and intensified pedogenesis suggest two competing processes of pedogenetic enhancement and pedogenetic depletion in the lower paleosols. Pedogenetic depletion dominates and is responsible for the low susceptibility. Changes in magnetic grain size distribution occur during pedogenetic depletion. The susceptibility variations are of multiple origins in the loess of the Ily Basin. Pedogenetic enhancement, pedogenetic depletion, and allochthonous input of magnetic minerals should all be taken into account to explain the variations of magnetic parameters.