| 不同国别进口铁矿石矿物学特征分析: 来自显微组分和元素分析的约束 |
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| 引用本文： | 张子傲,刘恩涛,许家省,严德天,刘曙,闵红.不同国别进口铁矿石矿物学特征分析: 来自显微组分和元素分析的约束[J].地质科技通报,2023,42(2):33-40. |
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| 作者姓名： | 张子傲 刘恩涛 许家省 严德天 刘曙 闵红 |
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| 作者单位： | 1a.中国地质大学(武汉)海洋学院 |
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| 基金项目： | 国家重点研发计划2018YFF0215402 |
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| 摘 要： | 我国是铁矿石资源进口大国，通过分析不同产地进口铁矿石的矿物学特征，可以为铁矿石原产地分析及固体废物属性鉴定提供参考依据。以11个常见进口国一级铁矿石样品为研究对象，综合运用偏光显微镜、X射线荧光光谱法（XRF）以及黄铁矿、磁铁矿LA-ICP-MS微量元素分析等方法，查明了各国铁矿石的元素组成和矿物组合特征，探究了不同产地铁矿石形成的地质环境。X射线荧光光谱分析表明铁矿石样品主要元素为Fe，O，其次为Si，Ca，Al，Mn，Tb，Ti，Mg，P，S，不同国别铁矿石元素含量存在差异。偏光显微镜光片鉴定表明铁矿石样品不仅矿物类型上存在差异，而且在副矿物种类和含量、结构构造等方面存在差别，这些差异性特征可以作为铁矿石产地判别的依据。磁铁矿微区原位微量元素的成因类型判别结果显示，澳大利亚磁铁矿主要为BIF建造型，而缅甸、老挝为矽卡岩型。采用多种技术表征不同产地铁矿石样品的矿物组成、元素含量、矿相组成、矿物形成环境的差异性，揭示了不同产地铁矿石样品的矿物学特征，对进口铁矿石质量的识别、管控和产地溯源具有重要意义。
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| 关 键 词： | 铁矿石 矿相分析 微量元素 LA-ICP-MS 矿床成因类型 |
| 收稿时间： | 2021-09-01 |
Analysis of mineralogical characteristics of imported iron ore from different countries: Constraints from maceral compositions and elemental analysis |
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| Affiliation: | 1a.College of Marine Science and Techology, China University of Geosciences(Wuhan), Wuhan 430074, China1b.Faculty of Earth Resources, China University of Geosciences(Wuhan), Wuhan 430074, China2.Technical Center for Industrial Product and Raw Material Inspection and Testing, Shanghai Customs, Shanghai 200135, China |
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| Abstract: | China is the largest importer of iron ore resources. Analyzing the mineralogical characteristics of imported iron ore samples imported from different countries can provide a reference for identifying the source of iron ore and solid waste attributes. In this paper, iron ore samples imported from 11 countries were used to determine their elemental compositions and mineral assemblages by polarized light microscopy investigation, X-ray fluorescence spectroscopy (XRF) and pyrite/magnetite LA-ICP-MS element analysis. These results are applied to explore the formation environment of iron minerals. XRF analysis results show that the main elements of iron ore samples are Fe and O, followed by Si, Ca, Al, Mn, Tb, Ti, Mg, P, and S. These elements are significant differences in iron ore among different countries. Polarizing microscopy investigation shows that there are great differences not only in mineral types but also in other aspects (e.g., accessory mineral types, accessory mineral content, and structure). These differences can be used as proxies for the identification of iron ore origin. Finally, in situ major and trace elements of magnetite were used to distinguish the genetic types of iron deposits. The magnetite deposits from Burma and Laos are skarn type, while those from Australia are mainly BIF type. In this study, multiple techniques were used to characterize the differences in element content, mineral facies composition and mineral-forming environment of iron ore samples and to comprehensively analyze the mineralogical characteristics of iron ore samples from different countries. These differences are of great significance for the identification, quality control and origin of imported iron ore resources. |
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