湖南新化地区煤变形变质与构造环境特征  

Coal deformation, metamorphism and tectonic environment in Xinhua, Hunan

作　　者：李焕同[1] 莫佳峰 武玉良[3] 曹代勇[3] 李翔[3] 李龙 

机构地区：[1]西安科技大学地质与环境学院,陕西西安710054 [2]湖南省煤炭地质勘查院,湖南长沙410014 [3]中国矿业大学(北京)地球科学与测绘工程学院,北京100083

出　　处：《煤田地质与勘探》2017年第4期7-12,18,共7页Coal Geology & Exploration

基　　金：国家自然科学基金项目(41502160);中国地质调查局地质调查项目(12120113074500);西安科技大学培育基金资助项目(2014012)~~

摘　　要：采用煤质化验、XRD、SEM等测试手段,分析煤的化学组分、结构特征、显微构造等特征,结合古应力估算值、古温度和应变速率等结果,探讨了湖南新化地区煤变形变质特征与构造环境的关系。结果表明:煤样的d_(002)值为3.36~3.39 nm,受天龙山构造挤压的局部应力场及叠加岩浆构造热的作用,煤逐渐转变为隐晶质石墨,结晶颗粒是由细小的鳞片组成的集合体,粒径集中在50~250 nm;石墨3R型含量随着煤化程度升高,石墨晶体开始增加,Rh相的数量减少;构造变形环境属于低温低围压高应变速率的浅层脆性–韧脆性构造域;天龙山岩体提供了构造热源,侧向挤压应力使寒婆坳向斜煤大分子结构有序化,层面间距减小,形成隐晶质石墨。This paper discusses in detail chemical composition, molecular structure, microstructure phenomena, es- timates the palaeo-stress, paleo-temperature and the strain rate to deepen the knowledge for the correlation o f coal deformation and metamorphism with structural environment in Xinhua Hunan by coal quality analysis, XRD and SEM methods.The results show that d002 value of coal samples is from 3.36 to 3.39 nm, coal changed gradually into aphanitic graphite with the increase of coal rank during coalification, which is characterized by graphite flakes, and the crystallite size is from 50 nm to 250 nm; A certain degree of 3R-structure content increased and the crystallite size extended with the coalification process, but Rh-structure content decreased; the tectonic environment of the study area belongs to the ductile-brittle deformation, which is characterized by low temperature, low stress, high strain rate; Tianlongshan magmatic intrusion provided heat source, its side-extrusion made the molecules structure of coal ordering, distance between layers decreased, finally it caused the formation of aphanitic graphite.

关 键 词：煤变形变质 构造环境 隐晶质石墨 结构特征 湖南新化 

分 类 号：TD712[矿业工程—矿井通风与安全]