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地球学报  2011 

新疆伊犁黄土磁化率增强机制差异性分析

DOI: 10.3975/cagsb.2011.01.10

Keywords: 伊犁黄土,磁化率,粒度,中亚,增强机制

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Abstract:

本文对处于西风区的新疆伊犁昭苏黄土剖面进行了磁化率和粒度分析,初步探讨了伊犁黄土磁化率增强机制的差异性。研究表明,伊犁黄土虽然粘土含量较黄土高原黄土高,但细粒组分对磁化率的贡献非常有限,粗颗粒组分对磁化率贡献较大,说明磁性载体主要存于粗颗粒组分中。同时研究发现地形、沉积环境、源区矿物组分和气候等多种因素对磁化率产生不同程度的影响。伊犁黄土磁化率成因机制既具有阿拉斯加风速论模式的特点又叠加了黄土高原成壤作用的模式,即使在同一剖面的不同时段两种模式对磁化率增强的贡献也不同,伊犁黄土磁化率增强机制存在着时空差异性。

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