黔西南煤中铂族元素的发现及其地质意义

Discovery and Geological Significance of Platinum Group Elements in Coals from Southwestern Guizhou

采用等离子源质谱分析方法 ( ICP-MS) ,对采自黔西南晚二叠世、晚三叠世煤层中 31个煤样中的铂族元素含量进行了测试分析 .结果表明 ,铂族元素含量最高值为 w( Pd) =5 .18× 10 - 6 ,w( Ir) =7.5× 10 - 9,w( Pt) =63.2× 10 - 6 ,都明显高于地壳中的平均含量 .煤层中铂族元素的含量分布不均匀 。

The platinum group elements in 31 coal samples from the Late Permian and Late Triassic coal beds of southwestern Guizhou were detected and analyzed using the ICP MS method. The result shows that the mass fraction of Pd, Ir and Pt can be up to 5.18×10 -6 , 7.5×10 -9 and 63.2×10 -6 , respectively. These values are obviously higher than the average ones in the earth's crust. The platinum group elements are not evenly distributed in coals. The genesis of the enriched platinum group elements in coals might be caused by the hydrothermal fluid in the late stage of various kinds of buried magma bodies.