华南地区晚二叠和晚三叠世煤中稀土元素特征研究

在华南地区贵州六盘水、江西乐平、露庆和湖北黄石矿区晚二叠和晚三叠世煤层的稀土元素ICP—MS分析数据的基础上，系统研究了研究区煤中稀土元素的含萤分布特征、赋存特征、配分模式以及地质控制因素。含量分布表明晚二叠世稀土元素含量总体高于晚三叠世；煤中稀土元素与灰分成正相关关系，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、同一时代煤中稀土元素的配分模式具有一定的相似性，而不同地区同一时代和同一地区不同时代煤中稀土元素的配分模式具有较大差异；煤的沉积环境，煤中无机矿物组成以及海水的影响是控制煤中稀土元素含量和配分模式的主要地质因素。

A Characteristic Study of Rare-Earth Elements in Southern China Late Permian and Late Triassic Coals

Based on the data of the rare-earth elements in Late Permian and Late Triassic coals from Lupanshui, Leping and Chongqing coal mining areas in southern China, the paper discussed characters of content distribution, occurrence, distribution pattern and geologic factors of the rare-earth elements in coals from studied areas. The rare-earth element content in coals is correlative to the ash content of those coals, a few of coal samples showed exceptional high content of rare-earth elements due to the presence of the heavy mineral assemblages. Distribution patterns of the rare-earth elements in the coals showed that the coals from the same district and the same geologic age have the similar characters. The coals have different characters are from different districts but yet the same geologic age, or the same district but different geologic ages. Sedimentary environments, mineral assemblages, and the sea water are main geologic factors influencing contents and distribution patterns of rare-earth elements in the coals.