标题:
贵州省黔西县二叠系龙潭组主采煤层微量元素分布特征及制约因素探讨Distribution Characteristics and Influence Factors of Trace Elements in Western Guizhou Permian Coal Measure Strata
作者:
刘玲, 谢樨, 魏怀瑞
关键字:
微量元素, 沉积环境, 主采煤层, 二叠系龙潭组, 贵州省黔西县Trace Element, Sedimentary Environment, Major Exploitable Coal Measure, Permian, Western Guizhou
期刊名称:
《Advances in Geosciences》, Vol.5 No.3, 2015-06-17
摘要:
黔西县是贵州主要的产煤县之一，煤炭资源丰富，煤层主要产于二叠系上统龙潭组(P31)地层中，属于织纳煤田。通过对主要矿区主采煤层系统取样分析，研究了不同煤层、不同矿区微量元素空间分布特征；与相邻的大方、赫章等区域煤层中微量元素含量对比发现，在陆源供给多的三角洲平原环境形成的煤层中微量元素含量相对高，在受海水影响较大的潮坪环境煤层中微量元素相对含量低，揭示了研究区陆源物质供给母岩——玄武岩具有较高的微量元素地球化学背景是其主要制约因素。个别煤层中有害元素Pb、Tl等含量高，是后期热液活动和断裂构造影响的结果。Guizhou has abundant coal resources, but little research has been done on the element geochemi-stry of coal measure strata in Guizhou Province, and the effective utilization of coal resources in Guizhou is a serious defect. Based on element geochemical studies of the main Permian exploitable coal measure strata in western Guizhou, the element geochemical distribution characteristics of the different coal seam and different mining area have been revealed, contrasting with the trace element content in Dafang, Hezhang, etc. The element contents are mainly affected by terrestrial material supply. Coal measures formed in the delta plain environment where sufficient terrestrial materials are supplied contain relatively abundant trace elements, whereas those formed in the tidal-flat environment influenced greatly by seawater have relatively low contents of trace elements, mainly controlled by the geological fact that basalts—the parent rocks of source regions contain high trace elements. The content of Tl and Pb in coal seam is higher, and it is the result of the late hydrothermal activity and the effect of the fracture structure.