兖州矿区山西组 3煤层中微量元素的特征分析

通过对兖州矿区山西组3煤层21个样品中全硫、硫化物硫、有机硫和具有环境意义的微量元素Cu、Pb、Zn、As、U、Th含量的测试，分析了微量元素在研究区煤层垂直方向上的变化特征及主要形成原因，并发现煤层中所选的微量元素、硫化物琉及全硫在煤层顶、底或煤层夹矸样品中含量相对较高。微量元素与硫化物硫、全硫的相关系数表明，所研究的微量元素与硫化物硫和全硫有明显的正相关关系，而且研究区3煤层中全硫的含量取决于硫化物硫的含量。同时还研究了原煤中微量元素的含量与灰产率的关系，并将研究区微量元素同世界和中国同类煤中的微量元素的含量进行了比较。

Geochemistry of trace elements from the No.3 coal seam of Shanxi Formation in the Yanzhou mining district

Trace elements in coal are important because of their association with en vironmental issues and the health of plants,animals and humans.Consideration must be given to essentiali ty and toxicity that depend on concentrations,the occurrence of t he element,pH and oxidation-reduction conditions and other factors.Du ring coal formation,which began from plants g rowing to peat swamp and to types of coal rank,there are many factors of influence upon migration and concen tration of trace elements.The facto rs mainly include plant types,chemi cal conditions,climate conditions,se a water aggression,magma hydrothermal fluid effect during coalificati on and matter exchange between coal and roc ks of roof and floor.So the formation and concentration of trace elements in coal is the synthesized results of ma ny geological factors during coalif ication stages.Concentrations of t race elements of Cu,Zn,Pb,As,Th,U and sulfur (S t ,S o ,S p )and their vertical variations of the coal seam from running underground coal mine in Yanzhou min ing district are reported.The analy tical results of the seam show that all selected trace elements,with excep tion of Th,are enriched in the top and bottom plies of the seam,and their concentrations are relatively high in dirt band plies of the seam.It is also identified that the pyritic sulfu r is positive to total sulfur and they are enriched in top,bottom and parting plies of th e seam.The concentrations of selected trace elements are closely related with sulfur and ash contents.Most of t he trace elements are relatively enr iched in high ash coal samples.In the meantim e,the mean values of the elements are compared with other coals in the world and Chinese.