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首页> 外文期刊>Geoderma: An International Journal of Soil Science >Magnetic separation and evaluation of magnetization of Brazilian soils from different parent materials.
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Magnetic separation and evaluation of magnetization of Brazilian soils from different parent materials.

机译：不同母体材料对巴西土壤的磁选和磁化强度评估。

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摘要

Ten selected Brazilian soils representative of Oxisols, Ultisols, Alfisols and Inceptisols and derived from gneiss, basalt, sandstone, diabase and itabirite were sampled and examined to provide insight into the behaviour of their magnetic minerals.The objective was to measure the magnetization of the sand, silt and clay fractions and to submit the clay fraction to variable magnetic fields to obtain the magnetization curves and to study their magnetic behaviour as related to their parent material lithology. The separation procedure using a magnetic separator was done in two different ways: dry separation for the sand and wet separation for the silt and clay fractions. X-ray diffraction patterns of magnetic and non-magnetic fractions were obtainedand the segregation of ferrimagnetic minerals were shown. The magnetization (sigmas) of the total and the magnetic and non-magnetic soil fractions was evaluated using a special analytical balance. The sigmas values obtained varied from 0.03 to 17.72 JthinT-1thinkg-1 for sand; 0.05 to 8.91 JthinT-1thinkg-1 for silt and 0.05 to 2.54 JthinT-1thinkg-1 for the clay fractions. The results from the magnetically concentrated fractions varied in the same fashion but reached higher values. Magnetization curves showed spontaneous magnetization (Ms) values of 0.6 to 3.35 JthinT-1thinkg-1, high field slopes (lambda) ranging from 0.17 to 0.77 JthinT-2thinkg-1 and, clearly, the influence of the parent material lithology on the nature of the soil magnetic behaviour. Magnetic measurements suggested pathways for ferrimagnetic minerals transformations in soil systems.
机译：对十种选自巴西的代表Oxisols，Ultisols，Alfisols和Inceptisols的土壤进行了采样和检查，这些样品来自片麻岩，玄武岩，砂岩，辉绿岩和伊塔岩，以了解其磁性矿物的行为，目的是测量沙子的磁化强度，粉砂和粘土组分，并将粘土组分置于可变磁场中以获得磁化曲线，并研究其与母材岩性有关的磁行为。使用磁选机的分离程序以两种不同的方式完成：对沙子进行干式分离，对淤泥和粘土级分进行湿式分离。得到了磁性和非磁性部分的X射线衍射图，并显示了亚铁磁性矿物的偏析。使用特殊的分析天平评估总土壤部分和磁性和非磁性土壤部分的磁化强度（sigma）。对于沙子，获得的sigma值从0.03到17.72 JthinT-1thinkg-1。淤泥为0.05至8.91 JthinT-1thinkg-1，粘土组分为0.05至2.54 JthinT-1thinkg-1。磁浓缩馏分的结果以相同的方式变化，但达到更高的值。磁化曲线显示0.6到3.35 JthinT-1thinkg-1的自发磁化（Ms）值，0.17到0.77 JthinT-2thinkg-1的高场斜率（lambda）以及母体材料岩性对铁素体性质的影响土壤的磁行为。磁性测量为土壤系统中亚铁磁性矿物转化提供了途径。

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