内蒙古胜利煤田0-1孔煤中微量元素地球化学特征

Trace element geochemical features of the coals in 0-1 borehole of the Shengli coal field in Inner Mongolia

运用电感耦合等离子体质谱和煤质分析等技术方法,对内蒙古胜利煤田0-1号钻孔揭露的早白垩世1、2和4号煤层(共20个煤分层,1个夹矸)进行了研究。结果显示,1、2号煤层的挥发分产率大于44%,透光率小于50%,煤类为褐煤;4号煤层挥发分产率42%,透光率53%,煤类为次烟煤(长焰煤);1、2号煤层灰分和硫含量较高,4号煤层灰分和硫含量较低。与世界煤微量元素含量平均值相比,1、2和4号煤层中Sb富集,V、Zr、Nb、Hf、W等元素轻微富集,其它微量元素的含量接近或低于世界煤含量的平均值。1、2和4号煤层中稀土元素和钇(REY)含量较低,根据上地壳标准值(La/Lu)N比值,所有煤分层均显示重稀土富集类型特征,而煤中泥岩夹矸则显示轻稀土富集类型特征。

The trace element geochemical compositions of 3 Early Cretaceous coal seams （20 coal samples, 1 parting sample） from the 0-1 borehole in the Shengli coal field of Inner Mongolia was investigated by using inductively coupled plasma mass spectrometry （ICP-MS）. The results show that No. 1 and No.2 coals are lignite （Vdaf〉44%, transmittance PM〈50%） with high ash yield and high sulfur content, the No. 4 coal is long-flame coal （Vdaf=42%, PM=53%） with low ash yield and low sulfur content. Compared with average values for coals in the world reported, Sb is enriched; V, Zr, Nb, Hf, and W are slightly enriched in the three coal seams, and the concentrations of other trace elements are either close to or much lower than the world＇s averages. Relative to things of the upper continental crust, the rare earth elements and yttrium in 20 coal samples are all characterized by heavy REY enrichment, whereas the parting sample is characterized by light REY enrichment.