知识与财富的链接
应用X射线荧光光谱(XRF)和电感耦合等离子体质谱(ICP-MS)方法研究了黄县盆地古近系煤中的常量元素、微量元素及稀土元素的地球化学特征,并根据敏感元素的指示意义探讨了研究区的沉积环境。研究结果表明:黄县盆地古近系煤中常量元素氧化物以SiO_2和Al_2O_3为主;与地壳相比,微量元素富集Mo、Sb、Pb、Bi,其中Mo的富集系数达7. 99。稀土元素含量整体较低,分布在14. 79～222. 78μg/g,平均65. 02μg/g,低于中国煤,接近世界煤。稀土元素分布模式中所有样品十分相似,均呈左高右低的宽缓"V"形曲线,具有明显的LREE富集、HREE亏损的特征,Eu存在明显负异常,表明各煤层稀土元素与陆源碎屑岩关系密切,且成煤期间稀土元素来源一致,陆源物质的供应相对稳定。黄县盆地煤中稀土元素主要以无机相赋存在煤中的黏土矿物中。灰成分指数(Fe_2O_3+CaO+MgO)/(SiO_2+Al_2O_3)、Mg/Ca、δCe/δEu、Sr/Ba以及V/(V+Ni)反映了黄县盆地古近系煤层的沉积环境为还原条件下的陆相淡水环境,且气候湿润,期间间歇受到过海水的影响。
By using the methods of X-ray fluorescence (XRF) and inductively coupled plasma mass spectrometry (ICP-MS), geochemistry characteristics of major, trace and rare earth elements were studied in Paleogene coal from Huangxian Basin. On the basis of the indicating significances of Sensitive elements,the sedimentary environment of research area was discussed. The results show that the oxides of macroelements are mainly with SiO2 and Al2O3 in Paleogene coal from Huangxian Basin. Trace elements including Mo,Sb,Pb,Bi are enriched and the enrichment factors of Mo is 7.99, compared with the average content of crust. The total content of rare earth element (REE) is distributed from 14.79 to 222.78μg/g. The average content of REE is 65.02μg/g, which is lower than that in Chinese coals and closer to that in world"s coal. The distribution patterns of rare earth elements are a wide and gentle "V" curve with high left and low right, which indicate that the light REE is enriched while the heavy REE is deficit and show the values of δCe positive and δEu negative anomalies. Moreover, the internal fractionation of light REE is high, and that of the heavy REE is low. The values of ash content index (Fe2O3+CaO+MgO) /(SiO2 +Al2O3),δEu,δCe, Sr/Ba, V/(V+Ni) illustrate that the sedimentary environment of Paleogene coal seams in Huangxian Basin is terrestrial freshwater environment under the condition of reduction, which may have been affected by sea water.
