宁夏香山南麓侏罗纪延安组煤中稀土元素的地球化学特征及地质意义
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1.宁夏回族自治区基础地质调查院宁夏回族自治区地质矿产中心实验宁夏 银川;2.宁夏回族自治区地质局宁夏 银川

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P595

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宁夏自然科学(2023AAC03765),2023 年度宁夏回族自治区青年科技托举人才培养项目,中国矿产地质志项目(编号DD20221695、DD20190379、DD20160346)联合资助


Geochemical Characteristics and Geological Implications of Rare Earth Elements in the Jurassic Yan’an Formation Coal from the Southern Foot of Xiangshan, Ningxia
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1.Geological Survey Insitute of Ningxia Hui Autonomous RegionGeology and Mineral Center Laboratory of Ningxia Hui Autonomous Region,Yichuan,Ningxia,;2.Ningxia Hui Autonomous Region Bureau of Geology,Yichuan,Ningxia;3.Geological Survey Insitute of Ningxia Hui Autonomous RegionGeology and Mineral Center Laboratory of Ningxia Hui Autonomous Region,Yichuan,Ningxia;4.Ningxia Hui Autonomous Region Bureau of Geology, Yichuan, Ningxia,

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    摘要:

    以宁夏香山南麓侏罗纪延安组煤为研究对象,采用电感耦合等离子体质谱、X射线荧光光谱、X射线衍射等方法分析了煤中稀土元素的地球化学特征,探讨了煤中稀土元素的赋存特征及地质意义。结果表明:研究区煤为低灰、中高挥发分、高发热量不黏煤,CaO、MgO、P2O5相对中国煤显著富集(富集系数分别为1.82、4.14、2.07);REE总量均值为63.49μg/g,远低于中国煤均值(139 μg/g),略高于世界煤均值(60.7 μg/g),呈轻稀土(LREE)相对富集(LREE/HREE均值8.11)、重稀土(HREE)分馏程度高于轻稀土(GdN/LuN均值1.73)、Eu显著正异常(δEu均值1.95)的配分模式;相关性分析与主成分分析表明REE主要赋存于硅铝酸盐黏土矿物及含钛黏土矿物中,陆源碎屑输入是其主要物质来源;基于REE地球化学参数、Al2O3-TiO2物源判别图解及多指标协同分析,揭示研究区延安组煤形成于寒冷干旱气候条件下、酸性水介质的还原性泥炭沼泽环境,物源区以中性岩为主并混有长英质组分,源岩继承性控制了REE的核心地球化学特征。

    Abstract:

    Taking the Jurassic Yanan Formation (Fm.) coal from the southern foot of Xiangshan in Ningxia as the research object to study the geochemistry characteristics of rare earth elements (REE) and discussed its occurrence characteristics and geological implications based on the data from X-ray fluorescence spectrometer and plasma mass spectrometer. The results indicate that the coal in the study area is non-caking coal characterized by low ash content, medium to high volatile matter and high calorific value. CaO, MgO and P<sub>2</sub>O<sub>5</sub> are significantly enriched relative to coals in China, with enrichment factors of 1.82, 4.14 and 2.07, respectively. The average total REE content is 63.49 μg/g, which is considerably lower than the average value of Chinese coals (139 μg/g) and slightly higher than that of global coals (60.7 μg/g). The coal displays a REE distribution pattern with relative enrichment of light rare earth elements (LREE) (average LREE/HREE = 8.11), higher fractionation degree of heavy rare earth elements (HREE) than LREE (average Gd?/Lu? = 1.73), and distinct positive Eu anomalies (average δEu = 1.95). Correlation analysis and principal component analysis suggest that REE mainly occur in aluminosilicate clay minerals and titanium-bearing clay minerals, with terrigenous clastic input as the dominant material source. On the basis of REE geochemical parameters, Al<sub>2</sub>O<sub>3</sub>-TiO<sub>2</sub> provenance discrimination diagrams and multi-index collaborative analysis, it is revealed that the Yan"an Formation coal in the study area was formed in a reducing peat swamp environment with acidic water media under cold and arid climatic conditions. The provenance is dominated by intermediate rocks mixed with felsic components, and the inheritance of source rocks dominates the core geochemical characteristics of REE.

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马风华,王成,马彦云,等. 宁夏香山南麓侏罗纪延安组煤中稀土元素的地球化学特征及地质意义[J]. 科学技术与工程, , ():

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  • 收稿日期:2026-04-13
  • 最后修改日期:2026-07-23
  • 录用日期:2026-09-09
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