Abstract Determination of the origin (geogenic or technogenic) of magnetic and geochemical imprints in soils and the role of weathering processes is crucial for the assessment of relationship between technogenic magnetic particles (TMPs) and potentially toxic elements (PTEs), iron and manganese. Our primary aim is to distinguish the most reliable methods for the appropriate interpretation of measured parameters strictly attributed to particular soil horizons (including bedrock), which is not yet very common in soil magnetometry. We examined six soil profiles developed from/on five different rock types (sedimentary and igneous rocks). The magnetic parameters reflect the concentration, type and grain size of the magnetic particles. Geochemical analysis consists of the determination of PTEs (Co, Cr, Cu, Ni, Pb and Zn), Fe and Mn. Quantification of soil contamination is based on calculating the index of geoaccumulation and enrichment factors. Interpretation is based on plots and magnetic and geochemical data, evaluated by principal component analysis for particular soil horizons. The results show that the volume magnetic susceptibility of the topsoil (mineral horizon Ah) in areas where the soil is developed from strongly magnetic bedrock is primarily influenced by geogenic magnetic particles (GMPs) derived from weathering processes. In cases of magnetic susceptibility determined on organic subhorizons (Oea or Oa), the magnetic parameters indicate the occurrence of TMPs. Moreover, the ratios of saturation isothermal remanent magnetization over magnetic susceptibility, and magnetic susceptibility over iron content help in distinguishing both geogenic and technogenic magnetic contributions. The variations of magnetic susceptibility and iron concentration reflect the presence of the strongly magnetic fraction in total soil iron content. Lead and zinc exhibit unambiguous technogenic influx into topsoil horizons. We conclude that the technogenic contamination dominates over geogenic enrichment in soils developed from/on weakly magnetic bedrock, but also strongly magnetic bedrock (without weathering effects).

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Regosols 和 Leptosols 中的技术污染或地质富集？表土层上的磁性和地球化学印记

摘要 确定土壤中磁性和地球化学印记的起源（地质成因或技术成因）以及风化过程的作用对于评估技术成因磁性颗粒 (TMP) 与潜在有毒元素 (PTE)、铁和锰之间的关系至关重要。我们的主要目标是区分最可靠的方法来正确解释严格归因于特定土壤层（包括基岩）的测量参数，这在土壤磁力测量中还不是很常见。我们检查了由五种不同岩石类型（沉积岩和火成岩）形成的六种土壤剖面。磁性参数反映磁性颗粒的浓度、类型和粒度。地球化学分析包括测定 PTE（Co、Cr、Cu、Ni、Pb 和 Zn）、Fe 和 Mn。土壤污染的量化是基于计算地积累和富集因子的指数。解释基于地块以及磁和地球化学数据，通过主成分分析对特定土壤层进行评估。结果表明，在土壤由强磁性基岩发育的地区，表土（矿层 Ah）的体积磁化率主要受风化过程产生的地磁颗粒（GMPs）的影响。在对有机亚地平线（Oea 或 Oa）确定磁化率的情况下，磁参数表明 TMP 的发生。此外，饱和等温剩磁与磁化率之比，铁含量的磁化率和磁化率有助于区分地质成因和技术成因的磁性贡献。磁化率和铁浓度的变化反映了土壤总铁含量中强磁性部分的存在。铅和锌显示出明确的技术流入表土层。我们得出结论，技术污染在由/在弱磁性基岩上发育的土壤中占主导地位，但也有强磁性基岩（没有风化作用）。