豫北煤田焦作、鹤壁、安阳矿区二_1煤层优势断裂构造地球化学特征  

Tectonogeochemical characteristics of preferred fault zones of the No.21 coalin Jiaozuo, Hebi, Anyang mining area, North Henan Province

作　　者：蒋建平[1] 罗国煜[1] 康继武[2] 

机构地区：[1]南京大学地球科学系,江苏南京210093 [2]焦作工学院资源与环境工程系,河南焦作454000

出　　处：《地球化学》2000年第4期367-375,共9页Geochimica

基　　金：煤炭科学基金资助项目!(地 9610809)

摘　　要：对豫北煤田焦作、鹤壁和安阳矿区二 1 煤层的对比样(构造煤和原生结构煤)进行了显微镜和扫描电镜下观察、镜质组反射率测试、X射线衍射分析和化学分析等。研究结果表明 ,构造煤因发生了断裂构造地球化学作用 ,其化学成分、元素成分和煤分子结构与原生结构煤明显不同 :构造煤的挥发分含量( %)比原生结构煤一般要小0 55～3 48 ,平均要小1 59 ;构造煤和原生结构煤相比 ,碳含量( %)平均增加了3 1 ,氢含量( %)平均减少了0 19 ;构造煤的最大反射率比原生结构煤平均要大0 447 ,双反射率一般大0 121 ;构造煤的002衍射峰比原生结构煤的要高且窄 ,芳香层碳平面网间的距离d002值平均要小0 006nm ,Lc 值平均比原生结构煤大3Through the observation under microscope and scanning electron microscope (SEM), the vitrinite reflectance, X ray diffraction (XRD), chemical composition of the No.21 coal (fault coal and primary coal) in Jiaozuo, Hebi, Anyang mining area, North Henan Province are obtained. The results show that the chemical composition and coal molecular structure are quite different between fault coal and primary coal. The average volatile content of fault coal samples is 7 17%, which is 1 59%less than that of primary coal samples. The carbon content of two third fault coal samples is larger than that of primary coal samples, and the average content increases 3 1%; the average hydrogen content of fault coal samples is 2 68%, which is larger than that of primary coal samples by 0 190 The maximum or minimum reflectivity of fault coal samples is 0 447 or 0 395 bigger than that of primary coal samples, and the double vitrinite reflectance (Rmax-Rmin) of fault coal samples ranges from 0 968 to 1 415, whose average value is 0 121 bigger than that of primary coal samples. The 002 diffraction peak of fault coal samples is higher and more narrow than that of primarycoal samples, and the average d002 reduces 0 006 nm and the average Lc increases 3 269 nm. These data of vitrinite reflectance and XRD show that fault coal molecular structure is more compact and more order, H and volatile escaped from coal, and the mass of coal molecular becomes larger. It is revealed that the vitrinite reflectance is an available index of both deformation and metamorphism of the No.21 coal. Therefore, the vitrinite reflectance plays the role of a bridge for studying deformation and metamorphism of the No.21 coal in the studied area, and it testifies that the No.21 coal underwent dynamometamorphism when it deformed, that is to say, there has occurred tectono geochemical actions for the No.21 coal which include dynamic differentiation action and dynamothermometamorphism.

关 键 词：化学成分 煤田 煤层 优势断裂 构造地球化学 

分 类 号：P618.110.2[天文地球—矿床学] P593[天文地球—地质学]