论文部分内容阅读
通过采用新建和改造后的煤相参数(凝胶化程度、植物结构保存指数、植物指数、搬运指数、地下水影响指数、水介质指标和沼泽类型指数等), 探讨了华北晚古生代成煤沼泽微环境与煤中硫的成因关系. 研究表明, 受海水明显影响的煤层, 对于煤中硫的聚集, 水介质特征在诸多沼泽微环境控制因素中发挥着主导作用; 淡水沼泽中硫的聚集与植物类型、水动力条件及覆水深度关系更为密切. 硫同位素地质分馏效应反映出煤中硫的聚集经历了多阶段演化. 煤中黄铁矿硫的形成早于有机硫, 其硫同位素d 34Sp值明显低于有机硫的d 34Sp值. 海水影响的煤中, 硫聚集时间的跨度大, 硫同位素分布发散, 煤的含硫量高. 受淡水影响的煤, 硫的聚集主要发生在同生-准同生阶段和早期成岩阶段, 硫的含量低且以有机硫为主.
Through the use of new and modified coal-phase parameters (gelatinization degree, plant structure preservation index, plant index, transport index, groundwater impact index, water medium index and swamp type index), we discussed the late Paleozoic coal- Environment and the cause of sulfur in coal.The study shows that coal seams obviously affected by seawater play a leading role in the control of the microenvironment in many swamps due to the sulfur accumulation in coal and the accumulation of sulfur Type, hydrodynamic conditions and water depth, the geological fractionation effect of sulfur isotope reflects that the accumulation of sulfur in coal undergoes multi-stage evolution.The sulfur formation of pyrite in coal is earlier than that of organic sulfur, and the sulfur isotope d34Sp value Significantly lower than the d 34Sp value of organic sulfur.The concentration of sulfur in the coal affected by seawater is large, the distribution of sulfur isotopes is divergent, and the sulfur content of coal is high.The concentration of sulfur in coal and sulfur affected by freshwater mainly occurs in symbiotic- Quasi-symbiotic and early diagenetic stages, low sulfur content and organic sulfur-based.