湘中地区煤系变形及煤变质作用特征分析

发布时间：2018-12-24 11:36

【摘要】：湘中地区测水组、龙潭组煤在强烈的岩浆热活动的影响下,叠加在区域变质作用背景之上,同时多期次、多层次的构造变形,使煤化作用过程复杂化。采用煤质分析、X射线衍射、扫描电子显微镜等实验手段,对湘中地区测水组、龙潭组煤系的煤化学组分及结构特征、显微构造分析,探讨煤系变形及煤变质作用特征。结果表明:煤变质带总体为北东向展布,在规模较大的含煤向斜周缘呈反向环带,呈反希尔特定律现象;层滑断裂引起的应力集中叠加岩浆热作用使局部地区煤变质程度增高,煤的物理性质、结构改变,形成构造煤;由于新化寒婆坳向斜天龙山岩体的构造-热耦合作用,煤中常见有镶嵌结构,且煤大分子结构趋向有序化,面网间距d002减小,芳香层片堆砌度增大,具有动力变质作用的典型结构特征,高煤级煤逐渐过渡为隐晶质石墨,由细小鳞片组成集合体,粒径在50~250 nm.
[Abstract]:Under the influence of strong magmatic thermal activity, the coal of the Shuihui formation and Longtan formation in central Hunan is superimposed on the background of regional metamorphism, at the same time, the multi-stage and multi-level tectonic deformation complicates the process of coalification. By means of coal quality analysis, X-ray diffraction, scanning electron microscope and other experimental methods, the coal chemical composition and structural characteristics, microstructure, deformation and metamorphism of coal measures in the central Hunan area were analyzed in terms of the chemical composition and structure of the coal measures of the Shuihui formation and the Longtan formation, and the characteristics of coal deformations and coal metamorphism were discussed. The results show that the coal metamorphic belt is generally distributed in the north to east direction, and the reverse ring zone appears at the margin of the larger coal-bearing syncline, which shows the phenomenon of anti-Hilt 's law. The stress concentration and magmatic thermal action caused by laminar slip fault increase the metamorphic degree of coal in local area and change the physical properties and structure of coal to form tectonic coal. Due to the tectonic-thermal coupling of the Tianlongshan rock body in the Xinhua Hanpo Depression syncline, the mosaic structure is commonly found in the coal, and the macromolecular structure of the coal tends to be ordered, the spacing of the surface network d002 decreases, and the piling degree of the aromatic lamellae increases. Typical structural characteristics of dynamic metamorphism, high coal rank coal gradually transition to cryptic graphite, composed of fine scales, the particle size is 50 ~ 250 nm.
【作者单位】：西安科技大学地质与环境学院;
【基金】：国家自然科学基金(41502160) 中国博士后科学基金(2016M592907XB) 西安科技大学培育基金(2014012)
【分类号】：P618.11

【相似文献】