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类地磁场对水铁矿向赤铁矿和针铁矿转化的控制

Control of Earth-like magnetic fields on the transformation of ferrihydrite to hematite and goethite.

作者信息

Jiang Zhaoxia, Liu Qingsong, Dekkers Mark J, Barrón Vidal, Torrent José, Roberts Andrew P

机构信息

State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, P.R. China.

Laboratory for Marine Geology, Qingdao National Oceanography Laboratory for Marine Science and Technology, Qingdao, P.R. China.

出版信息

Sci Rep. 2016 Jul 26;6:30395. doi: 10.1038/srep30395.

DOI:10.1038/srep30395
PMID:27458091
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC4960651/
Abstract

Hematite and goethite are the two most abundant iron oxides in natural environments. Their formation is controlled by multiple environmental factors; therefore, their relative concentration has been used widely to indicate climatic variations. In this study, we aimed to test whether hematite and goethite growth is influenced by ambient magnetic fields of Earth-like values. Ferrihydrite was aged at 95 °C in magnetic fields ranging from 0 to ~100 μT. Our results indicate a large influence of the applied magnetic field on hematite and goethite growth from ferrihydrite. The synthesized products are a mixture of hematite and goethite for field intensities <60 μT. Higher fields favour hematite formation by accelerating ferrimagnetic ferrihydrite aggregation. Additionally, hematite particles growing in a controlled magnetic field of ~100 μT appear to be arranged in chains, which may be reduced to magnetite keeping its original configuration, therefore, the presence of magnetic particles in chains in natural sediments cannot be used as an exclusive indicator of biogenic magnetite. Hematite vs. goethite formation in our experiments is influenced by field intensity values within the range of geomagnetic field variability. Thus, geomagnetic field intensity could be a source of variation when using iron (oxyhydr-)oxide concentrations in environmental magnetism.

摘要

赤铁矿和针铁矿是自然环境中最丰富的两种铁氧化物。它们的形成受多种环境因素控制；因此，它们的相对浓度已被广泛用于指示气候变化。在本研究中，我们旨在测试赤铁矿和针铁矿的生长是否受到类似地球值的环境磁场的影响。将水铁矿在95°C下于约0至约100μT的磁场中陈化。我们的结果表明，施加的磁场对水铁矿形成赤铁矿和针铁矿有很大影响。对于场强<约60μT，合成产物是赤铁矿和针铁矿的混合物。较高的场强通过加速亚铁磁性水铁矿聚集促进赤铁矿形成。此外，在约100μT的受控磁场中生长的赤铁矿颗粒似乎排列成链状，这些链状颗粒可能还原为保持其原始构型的磁铁矿，因此，天然沉积物中链状磁性颗粒的存在不能用作生物源磁铁矿的唯一指标。在我们的实验中，赤铁矿与针铁矿的形成受地磁场变化范围内的场强值影响。因此，在地磁环境中使用铁（氢氧）氧化物浓度时，地磁场强度可能是一个变化源。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/51ae/4960651/5652cdf135ad/srep30395-f7.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/51ae/4960651/5d51f60b43bc/srep30395-f1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/51ae/4960651/8878db3e72ed/srep30395-f2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/51ae/4960651/5e179dc12bdc/srep30395-f3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/51ae/4960651/e1a6c8bf2431/srep30395-f4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/51ae/4960651/0b35ad5b5f23/srep30395-f5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/51ae/4960651/1b3ca96396d0/srep30395-f6.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/51ae/4960651/5652cdf135ad/srep30395-f7.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/51ae/4960651/5d51f60b43bc/srep30395-f1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/51ae/4960651/8878db3e72ed/srep30395-f2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/51ae/4960651/5e179dc12bdc/srep30395-f3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/51ae/4960651/e1a6c8bf2431/srep30395-f4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/51ae/4960651/0b35ad5b5f23/srep30395-f5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/51ae/4960651/1b3ca96396d0/srep30395-f6.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/51ae/4960651/5652cdf135ad/srep30395-f7.jpg

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