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Ultrafine Magnetic Particles: A DIET-Proxy in Organic Rich Sediments?
Frontiers in Earth Science ( IF 2.9 ) Pub Date : 2020-12-30 , DOI: 10.3389/feart.2020.608387
Andrea Teixeira Ustra , Carlos Mendonça , Aruã da Silva Leite , Melina Macouin , Rory Doherty , Marc Respaud , Giovana Tocuti

In this work we present results of the magnetic properties characterization of sediment samples from a brownfield site that is generating methane biogas in São Paulo–Brazil. We applied interpretation procedures (frequency dependent susceptibility and time-dependent Isothermal Remanent Magnetization) appropriate to study the ultrafine magnetic fraction response of the samples. The higher content of superparamagnetic (SP) particles correlates well with the detected biogas pockets, suggesting that the methanogens activity produces these ultrafine particles, different from the magnetic particles at other depth levels. We propose the use of two simple measurement and interpretation techniques to identify such magnetic particles fingerprints. The results presented here support the use of environmental magnetism techniques to investigate biogeochemical processes of anaerobic microbial activity.



中文翻译:

超细磁性颗粒:富含有机物沉积物中的DIET替代品吗?

在这项工作中,我们介绍了在圣保罗-巴西产生甲烷沼气的棕地站点沉积物样品的磁特性表征结果。我们应用了解释程序(取决于频率的磁化率和取决于时间的等温剩余磁化强度)来研究样品的超细磁性分数响应。超顺磁性(SP)颗粒的含量较高与检测到的沼气袋相关性很好,这表明产甲烷菌的活性产生了这些超细颗粒,与其他深度水平的磁性颗粒不同。我们建议使用两种简单的测量和解释技术来识别此类磁性粒子指纹。

更新日期:2021-02-26
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