卧龙湖煤矿岩浆蚀变煤层中汞的分布与赋存特征

系统采集淮北卧龙湖煤矿岩浆蚀变煤层中岩浆岩、煤及顶底板岩石样品，测试分析了样品中汞、灰分、挥发分、水 分以及各形态硫的含量，探讨了岩浆蚀变煤层中汞的分布与赋存特征。结果表明：（1） 岩浆侵入导致煤中灰分升高，挥发 分降低，煤中硫主要以黄铁矿硫和有机硫存在；（2） 岩浆侵入导致煤中汞的富集，卧龙湖煤矿岩浆蚀变煤层中汞的平均含 量高达0.23×10-6，是华北石炭-二叠纪煤、中国煤以及美国煤中汞的平均含量的1.4 倍，1.2 倍和1.3 倍；（3） 煤中汞的含量 随离岩浆侵入体距离增大有逐渐降低的趋势，但在煤岩接触带附近，汞在岩浆侵入体上方和下方的煤中呈现不同的分布特 征；（4） 煤中的汞主要以无机结合态的形式存在，且大部分赋存在煤中的黄铁矿中，同时亦存在与有机硫结合的汞。岩浆 热液对煤层的侵入，导致煤质以及煤中汞的含量和赋存方式发生了显著变化。

Distribution and Modes of Occurrence of Mercury in Coal Seams Altered by Magmatic Hydrothermal from Wolonghu Coal Mine

Coal and rock samples from magmatic intrusion area of Wolonghu Coal Mine, Huaibei Coalfield, were systematically collected to determine contents of mercury, ash, volatile matter, and moisture and spectated sulfur, as well as to investigate the distribution and modes of occurrence of mercury in intruded coal seams. The results show that (1) the magma intrusion into coal seams resulted in the increase in ash content and the decrease in volatile matter. The main form of sulfur was pyrite sulfur (42.08% ) and inorganic sulfur (52.51%) in coal; (2) mercury in the intruded coal seams was as high as 0.23×10-6, which was 1.4, 1.2 and 1.3 times of that in the Carboniferous-Permian coals from North China, China and the USA; (3) the contents of mercury decreased with the increase in the distances between coal seams and intrusion body, and the distribution of mercury was different for the upper and lower coal seams in contact with the intrusion body; (4) mercury in the coal was mainly in inorganic form, primarily pyrite. Meanwhile, mercury bound with organic sulfur also exists. Magmatic hydrothermalism is identified as the causes accounting for the enrichment and change of forms of mercury, and the variations of coal quality.