Secondary ferrimagnetic minerals in Welsh soils: a comparison of mineral magnetic detection methods and implications for mineral formation
Secondary ferrimagnetic minerals in Welsh soils: a comparison of mineral magnetic detection methods and implications for mineral formation
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DOI：
10.1111/j.1365-246x.1997.tb01867.x
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发表时间：
1997-09-01
影响因子：
2.8
通讯作者：
Benjamin, SF
中科院分区：
文献类型：
--
作者：
Dearing, JA;Bird, PM;Benjamin, SF
一系列的低温和等温磁测量用于确定次生亚铁磁性矿物（SFM）的粒度在10个代表性的土壤样品从威尔士。对比频率相关磁化率（chi（FD）百分比）和低温剩磁测量结果表明，它们对不同范围的超顺磁性（SP）颗粒敏感，其中9个样品中SP颗粒和稳定单畴（SSD）颗粒的相对分布相似，土壤中以SFM为主的典型分布约为20- 30% SSD和70- 80% SP，在研究的样品中未检测到多域（MD）颗粒。有证据表明，某些土壤含有大量的超细SP颗粒< 0.010 μ m，在20 K时未被低温剩磁测量检测到，这将具有降低低场磁化率（chi（LF））和chi（FD）百分比值的效果。A：混合模型表明，chi（FD）百分比可用于半定量地估计样品中SP颗粒的比例。正偏态的粒度分布强烈地表明了SFM形成的机制，该机制是由在
A range of low-temperature and isothermal magnetic measurements are used to identify the secondary ferrimagnetic mineral (SFM) grain sizes in 10 representative soil samples from Wales. A comparison of percentage frequency-dependent susceptibility (chi(FD) percentage) and low-temperature remanence measurements shows that they are sensitive to different ranges of superparamagnetic (SP) grains, The relative distributions of SP grains and stable single domain (SSD) grains are similar in nine of the samples, Typical distributions for soils dominated by SFMs are approximate to 20-30 per cent SSD and 70-80 per cent SP, Multidomain (MD) grains were not detected in the samples studied. There is evidence that some soils contain significant numbers of ultrafine SP grains < 0.010 mu m that are not detected by low-temperature remanence measurements at 20 K and which will have the effect of depressing values of low-field susceptibility (chi(LF)) and chi(FD) percentage, A :mixing model suggests that chi(FD) percentage may be used semiquantitatively to estimate the proportion of SP grains in a sample. The positively skewed grain-size distributions strongly suggest a mechanism of SFM formation that is driven by processes at the