尼日利亚南部比达盆地帕蒂山周围铁矿石的地球化学、矿物学和岩石学研究:对质量评估、产地和沉积环境的影响

R. Ayuba, Y. Baba, L. Adamu, G. D. Ochu, A. Ebe, A. U. Emmanuel
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引用次数: 0

摘要

采用综合地球化学、矿物学和岩相学技术,对尼日利亚南部比达盆地帕蒂山出露的铁岩的矿物成分、地球化学和沉积环境进行了评估。在对十四个具有代表性的铁岩样本进行地球化学和岩石学研究时,使用了 X 射线荧光光谱法、X 射线衍射法和透射光显微镜。平均化学分析结果显示,SiO2(5.93 wt%)、TiO2(0.09 wt%)、Al2O3(10.76 wt%)和 Fe2O3(77.47 wt%)的浓度如下。如果 CaO、Na2O、K2O、MnO 和 CuO 的浓度小于 0.40,则该铁岩可能存在于浅海环境或非海洋环境中。考察样本中不存在氧化硫(SO3),以及二氧化硅与氧化铝(Al2O3)的双变量图和铁-锰-(铜+锌)的三角形图都证明了这一论断。CaO 含量低和不含 CO3 表明环境具有氧化性。经计算发现,铁的品位约为 54.180%,属于低品位。研究还发现,铁矿石中含有大量的煤矸石(Al2O3 和 P2O5),二氧化硅(SiO2)含量在允许范围内,且不含硫等有害物质。根据岩相学研究,框架颗粒显示出的浮动接触表明,这些铁水泥来源于地层。虽然它可以更有效地用作铸铁,但经过充分选矿(去除多余的二氧化硅)后,可用于钢铁生产。
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GEOCHEMICAL, MINERALOGICAL, AND PETROGRAPHICAL STUDIES OF IRONSTONES AROUND MOUNT PATTI, SOUTHERN BIDA BASIN, NIGERIA: IMPLICATIONS FOR QUALITY ASSESSMENT, PROVENANCE AND ENVIRONMENT OF DEPOSITION
The mineralogical composition, geochemistry, and depositional environment of the ironstone exposed on Mount Patti in the southern Bida Basin of Nigeria were assessed using integrated geochemical, mineralogical, and petrographic techniques. X-ray fluorescence spectrometry, X-ray diffraction, and transmitted light microscopy were used in geochemical, and petrographical investigations of fourteen representative ironstone samples. Average chemical analysis results showed that the concentrations of SiO2 (5.93 wt%), TiO2 (0.09 wt%), Al2O3 (10.76 wt%), and Fe2O3 (77.47 wt%) were as follows. The ironstone may be found in a shallow marine environment or non-marine environment if the concentrations of CaO, Na2O, K2O, MnO, and CuO are less than 0.40. This assertion is supported by the absence of sulfur oxide (SO3) in the examined samples and the bivariate plot of SiO2 versus Al2O3 and triangular plot of Fe-Mn-(Cu+Zn). Low levels of CaO and the absence of CO3 indicate that the environment is oxidizing. The iron's grade was calculated and found to be approximately 54.180%, which has been classified as low grade. The study also revealed that the ironstone contains a high amount of gangue materials (Al2O3 and P2O5), its silica (SiO2) content is within permissible limits, and it is devoid of harmful materials like sulfur. Based on petrographic studies, the floating contact displayed by the framework grains indicates that the iron cements were eodiagenetic in origin. Although it can be used more effectively as cast iron, sufficient beneficiation (to remove excess silica) can make it useful for iron and steel production.
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