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赤铁矿在自然界中广泛存在,具有重要的古地磁学和环境磁学意义。土壤中含有大量的杂质离子和分子,在成土作用过程中,这些杂质离子(主要是Al)会进入到赤铁矿的晶体结构中,形成含铝赤铁矿(Al-Hm)。为了确定不同的形成环境因素对Al-Hm中所含Al成分的影响,本文通过实验室合成了一系列的Al-Hm,并对各组样品的最终Al含量进行了测试。结果显示,最终样品的Al含量与初始溶液中的AI含量呈线性关系,前者随着后者的增加而增加,这说明环境中的初始Al含量是影响赤铁矿中Al替代量的一个最主要因素,它起到了源的作用。另外在弱酸或者弱碱性的常温环境中利于Al进入晶格结构。赤铁矿中Al的替代量可用来指示土壤中相对的富铝化强度。尽管影响赤铁矿中Al替代量的因素很多,但是不同环境中其影响因素存在很大差异,如黄土-古土壤和南方红土,所以赤铁矿中的Al替代量可作为区分不同来源赤铁矿的有利参数,具有重要的环境气候意义。
Hematite is widespread in nature and has important paleomagnetic and environmental magnetism implications. The soil contains a large amount of impurity ions and molecules. During the process of soil formation, these impurity ions (mainly Al) enter the crystal structure of hematite and form aluminum-containing hematite (Al-Hm). In order to determine the influence of different forming environmental factors on the Al composition contained in Al-Hm, a series of Al-Hm were synthesized in laboratory and the final Al content of each sample was tested. The results show that there is a linear relationship between the Al content in the final sample and the AI content in the initial solution, and the former increases with the latter, indicating that the initial Al content in the environment is one of the most important factors affecting the replacement amount of Al in hematite Factor, it serves as the source. In addition, weak acid or weak alkaline room temperature environment conducive to Al into the lattice structure. The replacement of Al in hematite can be used to indicate the relative enrichment of aluminum in the soil. Although there are many factors that affect the amount of Al substitution in hematite, there are significant differences in influencing factors in different environments, such as loess-paleosol and southern laterite. Therefore, the amount of Al substitution in hematite can be used to distinguish between different sources of hematite Beneficial parameters of the mine have important environmental and climate significance.