重庆长河碥矿煤的微量元素地球化学特征

Geochemistry of Late Triassic coals from the Changhebian mine in Chongqing,China

运用煤岩学和地球化学的理论和方法，对重庆长河碥矿晚三叠世须家河组煤中微量元素进行了研究。结果表明，长河碥矿各煤层中明显富集Pb，其平均值为29．58μg/g。长河碥矿煤中潜在的有害微量元素Be（5．9μg/g）、Cr（28．6μg/g）、Cu（34．06μg/g）、As（10．03μg/g）和Th（12．49μg/g）均较富集；稀土元素含量为59．79～287μg/g，均值为136．92μg/g，略高于中国煤中稀土元素总量均值（119．7μg/g），高于美国煤中的稀土元素总量均值（53．59μg/g）。8煤中稀土元素含量异常可能是地下水淋滤作用的结果。长河碥矿煤中有害微量元素主要受控于陆源物质的供给。

Five Late Triassic coal samples collected from Changhebian mine, Chongqing were characterized through a petrographic and geochemical investigation. The results showed that Pb is enrich in every samples, the mean content is 29.58 μg/g. Other hazardous elements such as Be （5.9μg/g）, Cr （28.6μg/g）, Cu （34.06μg/g）, As （ 10.03μg/g） and Th （ 12.49μg/g） are also concentrated in the coalfield. In addition, the content of REE ranging from 59.79 to 287 μg/g, with an arithmetic mean of 136.92μg/g, which is closed to the Chinese coals （ 119.7 μg/g） and higher than that of American coals （ 53.59 μg/g）. Especially, unusual character of REE in No. 8 coal seam probably may be caused by the leaching process of ground water. The origin of the hazardous elements was mainly dominated by the source rock from Kangdian uplift.