鄂尔多斯盆地西缘宁东煤田石炭-二叠纪太原组煤中主微量元素特征及其地质意义
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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

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P595

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宁夏自然科学(2022AAC03650、2023AAC03765),中国矿产地质志项目(编号:DD20221695、DD20190379、DD20160346)联合资助。


Geochemical Characteristics and Geological Significance of Major and Trace Elements in the Permo-Carboniferous Taiyuan Formation Coal From Ningdong Coalfield at the Western Margin of Ordos Basin
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Geological Survey Insitute of Ningxia Hui Autonomous RegionGeology and Mineral Center Laboratory of Ningxia Hui Autonomous Region,Yichuan,Ningxia

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    摘要:

    以宁东煤田石炭系煤为研究对象,基于X射线荧光光谱(XRF)、电感耦合等离子体质谱(ICP-Ms)、显微组分鉴定及工业分析等方法,对煤中主微量元素地球化学特征及地质意义进行了研究探讨。结果表明:宁东煤田石炭系煤中主量元素变化差异较大,仅Fe2O3低于中国煤均值;煤中主量元素主要来源于陆源碎屑供给、离子态络合及动植物等生物成因;煤中微量元素总体不富集,仅韦二矿煤中Rb(5.1)为富集程度,其他元素在不同矿区有不同程度的轻度富集,煤中微量元素主要赋存于黏土矿物中,来源于陆源碎屑供应及与有机质、自生矿物结合水溶态、离子态。TiO2/Al2O3指示煤中矿物质主要来源于长英质碎屑岩,CaO与MgO的正相关性揭示两者同源共生以白云石形式存在;Sr/Cu、CaO/(MgO?Al2O3)等参数揭示聚煤期为温暖潮湿环境,推测温度在15~30 ℃之间;Sr/Ba指示成煤沼泽为微咸水环境,说明受到海水的影响;Cu/Zn、V/(V+Ni)、Ni/Co、V/Cr等参数揭示成煤泥炭沼泽整体处于厌氧的氧化还原环境。总体上,宁东煤田石炭系煤的煤地球化学特征差异较为明显,认为主要受稳定地质背景下局部微地形、微地貌和微环境的影响控制。

    Abstract:

    In order to reveal the characteristics and geological significance of the main micronutrient geochemistry in the Carboniferous-Permian Taiyuan Formation in Ningdong Coalfield which deposited in marine-land transition coal-accumulating environment, the X-ray fluorescence spectrometry, plasma mass spectrometer, macerals identification and industrial analysis are used to study the source, occurrence and environmental significance of trace elements in coals. The results show that the content of major and trace elements in Carboniferous coals of Ningdong coalfield are varies greatly, except the Fe2O3 content is lower than the mean content of China coals. he Rb(5.1) is enriched in Weierkuang while other elements are slightly enriched in different micronutrient. The major and trace elements in coal are mainly occurs in clay minerals, and come from the supply of terrigenous clasts and the combination with organic matter and authigenic minerals in water-soluble state and ion state. The ratio of TiO2/Al2O3 indicate that the minerals in the coal are mainly derived from felsic clastic rocks, and the positive correlation between CaO and MgO indicates that they coexist in the form of dolomite. The ratio of Sr/Cu and CaO/(MgO?Al2O3) and the other parameters indicate the coal-accumulating period is in a warm and humid environment, it is inferred that the temperature is between 15 ° C and 30 ° C, the ratio of Sr/Ba indicates that the coal-forming marsh is a brackish water environment, which indicates that it is affected by seawater, The parameters of Cu/Zn, V/(V + Ni) , Ni/Co and V/Cr revealed that the peat-formed bog was in an anaerobic redox environment.

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马风华,汪栋刚,马瑞赟,等. 鄂尔多斯盆地西缘宁东煤田石炭-二叠纪太原组煤中主微量元素特征及其地质意义[J]. 科学技术与工程, , ():

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  • 收稿日期:2023-11-22
  • 最后修改日期:2024-06-11
  • 录用日期:2024-06-24
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