准格尔煤田黑岱沟露天矿煤中稀土及微量元素的分配规律

Distribution Rule of Rare Earth and Trace Elements in the Heidaigou Openpit Coal Mine in the Junggar Coal Field

对准格尔煤田黑岱沟露天矿煤的主量元素、稀土元素和微量元素含量和矿物组成进行了研究。结果表明,黑岱沟露天矿煤中稀土元素平均含量为248.12×10-6,约为中国煤平均值的2.83倍。LREE平均含量为236.66×10-6,HREE平均含量为11.46×10-6,LREE/HREE平均值为20.81,(La/Yb)N平均值为1.59,表明煤中LREE相对HREE富集。煤中部分稀土元素可能富集在勃姆石和黏土矿物中。稀土元素分配曲线δCeS变化区间(0.89～2.21)和δEuS中度亏损(0.46～0.86),验证了沉积环境在煤层形成演化过程中对煤中稀土元素输入的稳定性。黑岱沟煤层中微量元素明显偏高的有Ga、Pb、Se、Sr、Th和Zr,这些元素的含量高于中国、中国华北晚古生代和美国煤的算术均值,也高于地壳克拉克值。

This study performed the analyses of the contents of the major,rare earth and trace elements and mineral compositions of the Heidaigou Openpit Coal Mine.The results show that the average REE contentenriched relative to HREE.Part of rare earth elements in coal may be enriched in aluminosilicate and clay～0.86,verifying the stability of sedimentary environment played an important role in input of REEs to coal during the formation and evolution of coal seams.The content of trace elements（such as Ga,Pb,Se,Sr,Th and Zr）in the Heidaigou Coal Mine is obviously higher than that in China,North China Paleozoic and North America,and is higher than the crust Clarke value.