Rock Magnetic Studies of Soils and Pedogenic Processes

我们最近对土壤年代序列的磁性研究表明，岩石磁性研究是研究土壤和识别土壤非均质性的有力工具。磁化率、频变磁化率、经缓冲的强还原剂柠檬酸-碳酸氢钠-二亚硫酸盐处理后的磁化率损失、滞后剩余磁化以及其他岩石磁性性质表明，成壤作用将非磁性或弱磁性矿物转化为强磁性矿物，这些磁性矿物的粒度小于继承的磁性矿物的尺寸。在3个加利福尼亚年代序列中，岩石磁性指数随时间的变化接近线性，表明岩石磁性在土壤年代序列研究中可能是有用的，岩石磁性性质在土壤年代序列研究中可能是有用的。我们建议进行的研究的目标是进一步了解在最初工作中发现的过程和关系。特别是，我们将进一步探索岩石磁性与颗粒大小、矿物学、剖面位置和土壤形成过程的相互依赖关系。此外，我们将通过在更大范围的土壤上采样和测量岩石磁性来检验脚踏的推定年龄与岩石磁性指数之间的关系。

Our recent studies of the magnetic properties of soil chronosequences has shown that rock magnetic studies are a powerful tool for studying soils and identifying soil inhomogeneities. Magnetic susceptibility, frequency dependent susceptibility, loss of susceptibility upon treatment with the buffered strong reductant citrate-bicarbonate-dithionite, anhysteretic remanent magnetization, and other rock magnetic properties indicate that pedogenic processes convert non- or weakly-magnetic minerals to strongly magnetic minerals and that the particle size of these magnetic minerals are smaller than the size of the inherited suite of magnetic minerals. The time variation of indices of rock magnetic properties are nearly linear for pedons within three California chronosequences, indicating that rock magnetic properties may be useful in studies of soil chronosequences, indicating that rock magnetic properties may be useful in studies of soil chronosequences. The goal of the research that we propose to undertake is to further the understanding of the processes and relationships discovered in the initial work. In particular, we will further explore the interdependence of rock magnetic properties and particle size, mineralogy, profile location, and soil forming process. In addition, we will test the relationship between the presumed ages of pedons and rock magnetic indices by sampling and measuring rock magnetic properties on a wider range of soils.