Environmental Geochemistry Of Mercury In Coal From Magmatic Intrusion Area From Wolonghu Coal Mine

China Eastern coalfields was widely intruded by magan. The coal quality, coal seam structure and safe coal mining were greatly influenced by igneous rocks and the tarce hazardous elements was also enriched in coal which reported by Many researchers. Some coal and rock samples collected from magmatic intrusion area from Wolonghu coal mine in Huaibei were determined by X-ray diffraction, chemical experiments and instrument analysis. Combining with the knowledge of coal geology, petrology, mineralogy and element geochemistry, the environmental geochemistry of Hg and the geochemical responses of Hg to igneous intrusion in coals was investigated, and the results indicate as follows.(1) the intrusion of magma into coal seams resulted in the increase of ash content and the decrease of volatile matter. The main form of sulfur was Pyrite sulfur(42.08%) and inorganic sulfur(52.51%) in coal; (2) mercury in intruded coal seams was as high as 0.23 mg/kg, which was 1.4,1.2 and 1.3 times of that in coals from the Carboniferous-Permian in North China, China and the USA; mercury and source rock in coal are closely related, especially the cause of material input of magmatic hydrothermal invasion; (3) the contents of mercury decreased with the increase of the distances between coal seams and intrusion body, and the distribution of mercury was different in the upper and lower coal seams in contact with the intrusion body; (4) mercury in coal was mainly in inorganic form, primarily pyrite. Meanwhile.mercury bound with organic sulfur was also existed. Magmatic hydrothermal ism is identified as the reasons accounting for the enrichment and change of forms of mercury; (5) the contents of Co, Cr, Cu. Pb, Se and V were higher than the average of Chinese and Amercial coal. Co. Cr, Cu, Mn, Ni, Pb. Se and V decrease with increasing the distance from the intrusive, while Ba and Be increase; (6) Ba,,Be and Cd may occurs in clay minerals and carbonate minerals; Co, Ni, Pb and V are probably hosted in sulphide minerals and carbonate minerals; Cu shows a certain degree of sulphide minerals, the source apportionment of Ni. Pb, Co. V, Cu and Se was complicated. Zn may be related with the sulfide and Cr, Mn originated from rock; correlativity analysis reveals that the sources of Hg and Ba, Be, Cd are similar and they are from rock forming minerals and sulfide.