华南地区晚二叠世煤的稀土元素特征

在华南地区贵州六盘水、江西乐平和湖北黄石矿区以及重庆钟梁山和磨心坡煤矿晚二叠世煤的稀土元素电感耦合等离子质谱分析数据的基础上,系统研究了华南地区煤的稀土元素的质量分数分布特征、赋存特征、配分模式及其地质控制因素.煤的稀土元素质量分数与灰分质量分数呈正相关关系,部分煤样品由于有富稀土元素的重矿物组合的存在而出现稀土元素的异常高值.同一矿区晚二叠世煤的稀土元素配分模式具有一定的相似性,而不同地区晚二叠世煤的稀土元素配分模式则差异较大.煤的沉积环境、煤中无机矿物的组成以及海水的影响是控制煤的稀土元素质量分数及其配分模式的主要地质因素.

Analysis on the Characters of Rare-Earth Element in the Late Permian Coal from South China

Based on the data of the rare-earth element in coals from coal seams of the Late Permian Liupanshui,Leping,Huangshi and Chongqing coal mining districts in South China,this paper focuses on the discussion of the characters of content distribution,occurrence,distribution pattern and geologic factors of the rare-earth element in coals in the studied districts.The contents of rare-earth element in coals are correlative to the contents of the ash of these coals,with a few of coal samples showing exceptional high contents of rare-earth element due to the presence of the heavy mineral assemblages.Distribution patterns of the rare-earth element in coal are similar for the coals from the same district,and different for the coals of different districts.The sediment-environment,the mineral assemblages,and influence of marine are the main geologic factors of the contents and distribution patterns of rare-earth element in the coals.