大别山北麓高煤级煤的变形—变质类型  

DEFORMATION-METAMORPHIC TYPES OF HIGH-RANK COAL IN NORTHERN SLOPE OF THE DABIE MOUNTAINS, CENTRAL CHINA

作　　者：曹代勇[1] 张守仁[1] 

机构地区：[1]中国矿业大学煤炭资源教育部重点实验室,北京100083

出　　处：《地质科学》2003年第4期470-477,共8页Chinese Journal of Geology(Scientia Geologica Sinica)

基　　金：国家自然科学基金项目 (编号 :49872 0 67);博士点基金项目 ( 2 0 0 1 0 2 90 0 0 9)资助

摘　　要：对中国东部大别造山带前陆盆地石炭纪含煤岩系的高煤级煤进行了深入研究 ,划分出 3种变形—变质类型。构造—热变质类型煤样采自剪切应变带内 ,煤镜质组反射率各向异性显著 ,煤结构参数Lc 最大 ,La/Lc 和d0 0 2 最小 ,TEM下存在局部石墨化现象 ,呈现动力变质特征。岩浆热变质类型煤样受中生代花岗岩侵入体异常高温影响 ,Romax和Robi较大 ,显微镜下呈非均质结构 ,La/Lc 在 3类煤中最大。区域变质类型煤的Romax最小 ,但仍远远高于稳定地区相近地质时代煤 。The deformation and metamorphism of the Carboniferous coals, located in the northern foreland basin of the Dabie Orogenic Belt in the central China, were studied, based on which three predominant types of coal deformation metamorphism were divided, namely, tectono thermal metamorphism, telemagmatic metamorphism and regional metamorphism. The coal samples of tectono thermal metamorphic type were from a strong shear zone, whose anisotropy of vitrinite reflectance was intensive. Among the three groups of coal samples, L c of the tectono thermal metamorphic type was the largest, both the L a/ L c and d 002 values were the smallest. Some graphite texture in coal could be observed under TEM. These features suggested that coal was undergone dynamic metamorphism in varying degrees. The coal samples of telemagmatic metamorphic type were affected by abnormally high temperature near a granite intrusive in age of Mesozoic, which had large R o max and R o bi and nonhomogeneous texture under the microscope. L a/ L c value of this type was the largest among the three metamorphism types. The R o max value of regional metamorphic coal was the smallest among the three types but far larger than that of coal within craton basin in the same geological age, which demonstrated a high evolution degree of organic matters on the tectono thermal activity background near an orogenic belt.

关 键 词：大别山 高煤级煤 变形—变质 煤化作用 

分 类 号：P542[天文地球—构造地质学] P588.33[天文地球—地质学]