淮南煤田8煤层中黄铁矿的特征研究及成因分析

借助光学显微镜和扫描电镜（SEM）揭示了淮南四个井田8煤层中黄铁矿的显微和亚微结构特征。煤层中黄铁矿的形态主要有莓球状、团块状、结核状及解理裂隙充填状。通过此次研究发现在属低硫煤的淮南煤田中，顾桥井田的黄铁矿含量偏高。结合酸碱指数（AAI）、盐度指数（SI）和滞留指数（RI）三个灰成分指相参数判定，顾桥井田中黄铁矿含量相对较高，原因是其沼泽水体的还原性较强、盐度大及水动力条件差。莓球状和结核状黄铁矿形成的原因是粘土矿物的晶格上铁与H：S反应发育而成，而充填胞腔或者沉积裂隙的黄铁矿，大多是因局部强还原微环境所致。

Characteristic Study and Geological Genesis Analysis of Pyrite in No.8 Coal in Huainan Coalfield

The microscopic and submicroscopic structural features of pyrite had been revealed with an optical microscope and scanning electron microscopy （SEM） in No.8 coal in four areas of Huainan, and the phenomenon of high levels of pyrite in the Guqiao mine have been found. The peat swamp environment of the mine including water pH, salinity and hydrodynamic conditions were determined by three facies indicating parameters of ash composition, acid-alkali index （AAI）, salinity index （SI） and retention index （RI）. While the geological genesis of different pyrites has been analyzed in different peat swamp environments. The different content of pyrite had been analyzed in every mines, provided a theoretical basis for rational utilization of coal resources.