黔北煤田花秋勘探区9、16号煤稀土元素地球化学特征

GEOCHEMICAL CHARACTERISTICS OF LANTHANIDE IN THE 9^(TH) AND 16^(TH) COAL SEAMS IN THE HUAQIU EXPLORATION AREA IN NORTHERN GUIZHOU COALFIELD

采集黔北煤田花秋勘探区91、6号煤层及其顶板30余件样品进行了稀土元素测试,分析表明,该区煤中稀土元素分配模式曲线呈明显的左高右低的宽缓的"V"字型,轻、重稀土有明显的分离;其分配模式曲线特征与淮南、淮北二叠纪煤样的稀土元素分配模式曲线相似,但其稀土的总量明显高于淮南、淮北等矿区;受海相影响较大的16号煤层中稀土元素的含量明显高于受海相影响较小的9号煤层,说明煤中稀土元素一定的继承性,同时也表明影响煤中稀土元素含量的因素是复杂的。

More than 30 lanthanide samples were collected from the 9^th and 16th coal seams and the top coal seams in the Huaqiu exploration area. The results showed that the distribution pattern curve of lanthanide is broad and gentle ＂V＂ shaped and the left side is significantly higher than the right side. Meanwhile, obvious fmctionation occurred between LREE and HREE. Although the distribution pattern curve of lanthanide is similar to that of Permian coal samples collected from Huainan ＆ Huaibei, the total REE amount is significantly higher. In the 16^th coal seam, which is more affected by marine facies, the contents of lanthanide are remarkably higher than those in the 9^th coal seam. This means the lanthanide in the coal seams is of a certain inheritance, and it is also shown that the factors affecting the contents of lanthanide are very complicated. In this paper an important coal seam in the Huaqiu exploration area was chosen as an object of study in the Northern Guizhou Coalfield for the first time and more comprehensive research was conducted on the geoehemieal characteristics of lanthanlde in the coal seam.