岩浆侵入煤层中锑的赋存特征——以淮北卧龙湖矿为例

为探讨岩浆蚀变作用对煤层中锑赋存特征的影响，系统采集安徽淮北煤田卧龙湖煤矿岩浆侵入煤层侵入岩和全煤层样品共12个，利用原子荧光光谱法（AFS）测定样品中Sb含量，并对煤质参数进行分析。结果表明:卧龙湖煤矿岩浆侵入区煤表现为超低挥发分，中等灰分，特低硫的特点，煤中的硫主要以有机硫和黄铁矿硫存在。受岩浆热液影响，煤中灰分增加，挥发分减少；岩浆蚀变煤层中锑明显富集，算术平均值达到10.48 mg/kg，且侵入岩上方煤中Sb的平均含量明显增高，煤岩接触带位置Sb的含量达到最高值（13.93 mg/kg）；岩浆蚀变煤中的锑主要以无机结合态形式存在（相关系数r为0.74），有机硫与煤中Sb呈显著负相关（相关系数r为-0.60）。岩浆侵入作用导致卧龙湖煤矿煤的煤质特征及煤层中锑的赋存方式受到不同程度的影响，研究结果可为特殊地质作用下煤中锑的环境地球化学特征提供参考。 

Occurrence of antimony in magmatic intrusive coal seam: A case study from the Wolonghu coal mine,Huaibei coalfield,China

In order to investigate the influence of magmatic alteration on the occurrence characteristics of antimony in coal seam, 12 samples of magmatic magma and coal were collected from Wolonghu coal mine in Huaibei coalfield, Anhui Province, and the content of Sb was determined by atomic fluorescence spectrometry(AFS). The coal quality parameters are analyzed. The results are as follows:the coal in Wolonghu magmatic intrusion area has the characteristics of ultra-low volatile matter, medium ash content and ultra-low sulfur content. And the main forms of sulfur in coal are organic sulfur and pyrite sulfur. Under the influence of magmatic hydrothermal solution, ash in coal seam increases and volatile content decreases. The content of antimony in Wolonghu coal mine is obviously enriched, with an average of 10.48 mg/kg. The average content of Sb in the coal above the intrusive rock is obviously increased, and the content of Sb in the contact zone of coal and rock reaches the highest value(13.93 mg/kg). The antimony in magmatic altered coal mainly exists in the form of inorganic binding(r=0.74), while organic sulfur is negatively correlated with Sb in coal(r=-0.60). The magmatic intrusion resulted in the coal quality characteristics and the occurrence of antimony in Wolonghu coal mine. This result enriches the environmental geochemical study of antimony in coal under special geological process.