Abstract：Gongchangling iron mine is the largest BIF-hosted high-grademagnetite ore deposit in China, various scholars have carried out many researches, however few studies are related to Raman spectra of magnetite. This paper measured the Raman spectra of magnetite in typical BIF ore and high-grade iron ore of Gongchangling by HORIBA XploRAPLUS micro-Raman spectrometer. The results show that the peaks of magnetite in BIF at 300, 550 and 670 cm-1 shift to high wavenumber, which should be related to the increase of the average oxidation state of magnetite in BIF and the decrease of miner allattice size caused by the isomorphic substitution of trace elements. The Raman peak intensities of magnetite in high-grade iron ore increase obviously, probably due to the decrease of the overall content of trace elements and, correspondingly, the relative increase of iron ion content in magnetite. Some magnetites in BIF ore show weak Raman spectral features of hematite, which may be related to the epigenetic oxidation after the formation of magnetite. X-ray diffraction (XRD) analysis shows that the main iron mineral in the high-grade ore is magnetite, whereas the magnetite in the BIF ore is more similar to magnesioferrite. The results of SEM-EDS suggest that the contents of trace elements in the magnetite from high-grade iron ore are lower than those from BIF ore, i.e., experiencing the process of “purification”, which is consistent with the abovementioned conclusion. The research indicates that Raman spectra measurement is proven to be a fast, simple, reproducible and non-destructive method and can be used to estimate the overall content of trace elements of magnetite and further distinguish the magnetite both in BIF and high-grade iron ores of Anshan-Benxi area.
Key words：Magnetite; Raman spectra; Gongchangling high-grade iron ore
刘 静，姚玉增，付建飞，李梓宁，侯婷婷，张永利. 弓长岭磁铁矿拉曼光谱特征及意义[J]. 光谱学与光谱分析, 2024, 44(06): 1697-1702.
LIU Jing, YAO Yu-zeng, FU Jian-fei, LI Zi-ning, HOU Ting-ting, ZHANG Yong-li. Micro-Raman Spectral Characteristics and Implication of Magnetite in Gongchangling Iron Mine. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2024, 44(06): 1697-1702.
[1] Zhang Z, Hou T, Santosh M, et al. Ore Geology Reviews, 2014, 57: 247.
[2] LI Hou-min，WANG Rui-jiang，XIAO Ke-yan，et al（李厚民，王瑞江, 肖克炎，等）. Geological Bulletin of China（地质通报），2010，29(1)：1.
[3] HE Jia-le，PAN Zhong-xi，DU Gu（何佳乐，潘忠习，杜 谷）. Geological Survey of China（中国地质调查），2022，9(5)：111.
[4] ZHOU Shi-tai（周世泰）. Geology of Banded Iron Ore in Anshan-Benxi Area（鞍山-本溪地区条带状铁矿地质），Beijing：Geology Press（北京：地质出版社），1994. 1.
[5] HE Jia-le，PAN Zhong-xi，RAN Jing（何佳乐，潘忠习，冉 敬）. Acta Geologica Sichuan（四川地质学报），2016，36(2)：346.
[6] Frezzotti M L，Tecce F，Casagli A. Journal of Geochemical Exploration，2012，112：1.
[7] Guo C，Hu Y，Qian H，et al. Materials Characterization，2011，62(1)：148.
[8] YIN Yan-shan，YIN Jie，ZHANG Wei，et al（尹艳山，尹 杰，张 巍，等）. Spectroscopy and Spectral Analysis（光谱学与光谱分析），2018，38(3)：789.
[9] CHEN Guang-yuan，LI Mei-hua，WANG Xue-fang，et al（陈光远，黎美华，汪雪芳，等）. Minerals and Rocks（矿物岩石），1984，4(2)：14.
[10] Muralha V S F，Rehren T，Clark R J H. Journal of Raman Spectroscopy，2011，42(12)：2077.
[11] van der Weerd J, Rehren T, Firth S, et al. Materials Characterization，2004，53(1)：63.
[12] Nakagomi F，Da Silva S W，Garg V K，et al. Journal of Solid State Chemistry，2009，182(9)：2423.
[13] Sun X H，Zhu X Q，Tang H S，et al. Ore Geology Reviews，2014，60：112.
[14] Huang X W, Beaudoin G. Economic Geology, 2019, 114(5): 953.
[15] Wang C, Shao Y, Zhang X, et al. Minerals, 2018, 8(5): 195.
[16] Sarah A S Dare，Sarah-Jane Barnes，Georges Beaudoin，et al. Minerallium Deposita，2014，49：785.
[17] Hu H，Lentz D，Li J W，et al. Economic Geology，2015，110(1)：1.
[18] Li H M, Yang X Q, Li L X, et al. Journal of Asian Earth Sciences, 2015, 113: 998.
[19] Nadoll P, Angerer T, Mauk J L, et al. Ore Geology Reviews, 2014, 61: 1.
[20] LI Li-xing，LI Hou-min，FU Jian-fei，et al（李立兴，李厚民，付建飞，等）. Geology in China（中国地质），2022，49(4)：1353.
