Metallogenic mechanism of Pingguo bauxite deposit, western Guangxi, China: Constraints from REE geochemistry and multi-fractal characteristics of major elements in bauxite ore

CAO Jing-ya; WU Qian-hong; LI Huan; OUYANG Cheng-xin; KONG Hua; XI Xiao-shuang

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Metallogenic mechanism of Pingguo bauxite deposit, western Guangxi, China: Constraints from REE geochemistry and multi-fractal characteristics of major elements in bauxite ore

机译：桂西平果铝土矿床成矿机理：铝土矿中稀土元素地球化学特征及主要元素的多重分形特征

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Major and REE geochemistry and multi-fractal analysis of two types of bauxite (primary bauxite and accumulated bauxite) ores were studied in Pingguo bauxite orefield in western Guangxi, China. The results of geochemical data show that the accumulated bauxite has a feature of high Al2O3 whereas relative low Fe2O3and SiO2 contents compared to the primary bauxite. The similar chondrite-normalized rare earth element (REE) patterns illustrate that they have a cognate relationship. However, the negative Ce anomalies of primary bauxite and positive Ce anomalies of accumulated bauxite indicate that the ore-forming system changed from reducing environment to oxidation environment. The results of multi-fractal spectrum and parameters of Al2O3, Fe2O3and SiO2 between primary bauxite and accumulated bauxite show that the distinct multi-fractal spectrum parameters reflect the different grade distribution between accumulated and primary bauxite ores. Metallogenic process from primary bauxite to accumulated bauxite is accompanied by the loss of diffluent elements (e.g., Si and S) and enrichment of stable elements (e.g., Al and Fe) in the surface environment. Among the rest, the migration mechanism of iron during the evolutionary process from primary ore to accumulated ore can be described as combined leaching and chemical weathering action with participation of sulfur.

机译：在桂西平果铝土矿田，研究了两种类型的铝土矿（原生铝土矿和累积铝土矿）的主要和稀土元素地球化学以及多重分形分析。地球化学数据的结果表明，与原生铝土矿相比，积累的铝土矿具有较高的Al2O3特征，而Fe2O3和SiO2含量相对较低。相似的球粒陨石归一化稀土元素（REE）模式说明它们具有同源关系。然而，原生铝土矿的Ce负异常和累积铝土矿的Ce正异常表明成矿系统从还原环境转变为氧化环境。原生铝土矿与累积铝土矿之间的Al2O3，Fe2O3和SiO2的多重分形光谱和参数结果表明，独特的多重分形光谱参数反映了累积铝土矿和原生铝土矿之间不同的品位分布。从原生铝土矿到累积铝土矿的成矿过程伴随着表面环境中扩散元素（例如Si和S）的损失和稳定元素（例如Al和Fe）的富集。在其余部分中，铁在从原矿到累积矿的演化过程中的迁移机理可描述为浸出和化学风化作用结合硫的参与。

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《中南大学学报（英文版）》 |2017年第7期|1627-1636|共10页
作者
CAO Jing-ya; WU Qian-hong; LI Huan; OUYANG Cheng-xin; KONG Hua; XI Xiao-shuang;
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Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring of Ministry of Education (Central South University), Changsha 410083, China;

School of Geosciences and Info-Physics, Central South University, Changsha 410083, China;

Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring of Ministry of Education (Central South University), Changsha 410083, China;

School of Geosciences and Info-Physics, Central South University, Changsha 410083, China;

Department of Resources Science and Engineering, Faculty of Earth Resources, University of Geosciences, Wuhan 430074, China;

Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring of Ministry of Education (Central South University), Changsha 410083, China;

School of Geosciences and Info-Physics, Central South University, Changsha 410083, China;

Engineering Research Center of Hunan Earthquake Administration, Changsha 410001, China;

Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring of Ministry of Education (Central South University), Changsha 410083, China;

School of Geosciences and Info-Physics, Central South University, Changsha 410083, China;

Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring of Ministry of Education (Central South University), Changsha 410083, China;

School of Geosciences and Info-Physics, Central South University, Changsha 410083, China;

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Metallogenic mechanism of Pingguo bauxite deposit, western Guangxi, China: Constraints from REE geochemistry and multi-fractal characteristics of major elements in bauxite ore

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