华北晚古生代煤中黄铁矿赋存特征与地质成因研究  

Occurrence and geological genesis of pyritesin Late Paleozoic coals in North China

作　　者：刘大锰[1] 杨起[1] 周春光 汤达祯[1] 康西栋[1] 

机构地区：[1]中国地质大学能源地质系,北京100083

出　　处：《地球化学》1999年第4期340-350,共11页Geochimica

基　　金：国家自然科学基金!(编号:49572129;49632090)

摘　　要：应用煤岩学、煤化学、元素地球化学、同位素地球化学等学科的理论和方法，对华北晚古生代８ 层主采煤层中黄铁矿的赋存特征和地质成因进行了全面而系统的研究。结果表明，镜下可划分出莓球状、自形粒状、鱼子状、块状、均一球形、他形、结核状和节理裂隙充填等八种类型的黄铁矿。根据黄铁矿的形态、大小、共生组合关系，与其他组分的空间配置关系，黄铁矿的Ｓ、Ｆｅ 含量及Ｓ／Ｆｅ 原子比以及伴生元素等特征，划分出四个不同的形成世代。应用Ｓ 同位素研究了煤中黄铁矿硫的形成世代。指出沼泽水介质性质是煤中Ｓ 含量高低的决定因素。The occurrence and geological genesis of pyrite in Late Paleozoic coals of North China have been systematically studied by way of the theory and methods of coal petrology, coal chemistry, elemental geochemistry and sulfur isotopic geochemistry. The results suggest that eight types of pyrites, i.e. framboidal, automorphic granular, oolitic, massive, homogeneously spherical, allotriomorphic, nodular, joint and fissure filling pyrites can be divided under the microscopy. Four generations of pyrite are also recognized according to the shape, size, coexisting assemblage, space distribution relationship with other macerals, the contents of sulfur and iron, the atomic S/Fe ratio and associated elements in pyrite. The sources of sulfur in Late Paleozoic coals of North China are considered to be diverse using the sulfur isotopic variations in pyrite. The δ34S value of pyrite generated at the early stage prefers to be negative,and at the late stage prefers to be positive.

关 键 词：煤 黄铁矿 赋存特征 形成世代 地质成因 煤矿床 

分 类 号：P618.110.4[天文地球—矿床学] P618.110.2[天文地球—地质学]