Geochemistry of rare earth elements in a marine influenced coal and its organic solvent extracts from the Antaibao mining district, Shanxi, China

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• 作者：Wenfeng Wang ; Yong Qin ; Shuxun Sang ; Yanming Zhu ; Chaoyong Wang ; Dominik J. Weiss
• 关键词：Marine influenced coal ; Extraction ; Rare earth elements ; Geochemistry
• 刊名：International Journal of Coal Geology
• 出版年：2008
• 出版时间：1 December 2008
• 年：2008
• 卷：76
• 期：4
• 页码：309-317
• 全文大小：1388 K

文摘

Twenty-six samples including roof, bottom and coal plies of a marine influenced coal bed were collected from the Antaibao mining district, Shanxi, China. The rare earth elements (REEs) were determined in solids and organic solvent extracts. The distribution pattern showed three distinct patterns: shale-like, LREE-rich and HREE-rich. This is attributed to the variable microenvironment of peat-forming swamp, the degree of marine influences and different REE sources. REEs in the coal are mainly controlled by detrital minerals but also affected by seawater. The chondrite-normalized REE patterns of the organic solvent extracts are distinctly different from those of corresponding original coal samples, which show a negative Eu anomaly, a depletion of middle REEs and an enrichment of HREEs. The LREEs in coal extracts are likely adsorbed by hydrogen-containing functional groups, and HREEs are likely bonded to carbon atoms.