贵州普安—晴隆矿区晚二叠世煤及煤灰中伴生元素的富集特征

发布时间：2018-11-18 10:28

【摘要】：运用电感耦合等离子体质谱仪(ICP-MS)和电感耦合等离子体发射光谱仪(ICP-AES)分别对普安—晴隆矿区晚二叠世C17、C19、C22和C26号煤层中8个煤样和7个煤灰样进行微量元素含量的测试分析。结果表明,煤及煤灰中明显富集Li、Sc、V、Cr、Co、Ge、As、Nb、Mo、W、U等元素,且各元素在煤灰中更加富集,Nb、Zr、V、Ga和U等伴生金属元素的含量基本达到或超过了对应元素的边界品位或最低工业品位。煤中伴生元素的富集成因研究表明,V、Cr、Co、Nb和Zr等元素的富集主要受物源区峨眉山玄武岩风化碎屑物质供给的控制;U、S、Mo等元素的有限富集与海水作用有关;而受成煤期同沉积火山灰沉降的影响,煤中Li、Nb、Zr、Mo和U等微量元素表现出一致富集的特点;成煤期后的低温热液作用,使得各煤层,尤其是底部煤层(C19、C26)明显富集As、Mo、U和W等元素。综合分析认为,成煤期同沉积的火山灰沉降和成煤期后的低温热液作用是普安—晴隆矿区晚二叠世煤中伴生元素异常富集的主控地质因素。
[Abstract]:Inductively coupled plasma mass spectrometer (ICP-MS) and inductively coupled plasma emission spectrometer (ICP-AES) were used to study the late Permian C17C19 in Puan-Qinglong mine area. The trace element contents of 8 coal samples and 7 coal ash samples in coal seam C22 and C26 were measured and analyzed. The results show that Li,Sc,V,Cr,Co,Ge,As,Nb,Mo,W,U and other elements are obviously enriched in coal and coal ash, and each element is more enriched in coal ash. Nb,Zr,V, is more abundant in coal and coal ash. The content of associated metal elements, such as Ga and U, basically reached or exceeded the boundary grade or the lowest industrial grade of the corresponding elements. The study on the enrichment genesis of associated elements in coal shows that the enrichment of elements such as Vapor CoNb and Zr is mainly controlled by the supply of weathering clastic materials in the Emeishan basalt from the source area, and the limited enrichment of the elements such as Uttrium molybdenum is related to the interaction of sea water. However, due to the same deposition of volcanic ash during the coal-forming period, the trace elements such as Li,Nb,Zr,Mo and U in coal show the characteristics of "one enrichment set". The low temperature hydrothermal action after coal-forming stage makes all coal seams, especially the bottom coal seam (C19C26), obviously enrich elements such as As,Mo,U and W, etc. The comprehensive analysis shows that the volcanic ash deposition in the same sedimentary period and the low temperature hydrothermal action after the coal-forming period are the main controlling geological factors for the abnormal enrichment of associated elements in the late Permian coal in Puan-Qinglong mining area.
【作者单位】：贵州大学资源与环境工程学院;中国地质大学(武汉)资源学院;
【基金】：贵州大学研究生创新基金(2015060) 贵州省国土厅尾矿资源调查项目(2015034)~~
【分类号】：P618.11

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