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湖南寒婆坳矿区热变质煤结构演化及其矿物学特征响应
投稿时间:2019-08-23  修订日期:2020-04-28  点此下载全文
引用本文:
DOI:10.19762/j.cnki.dizhixuebao.2020206
摘要点击次数: 53
全文下载次数: 63
作者单位E-mail
李焕同 西安科技大学地质与环境学院 htlcumt@126.com 
王楠 西安科技大学  
朱志蓉 西安科技大学地质与环境学院  
石媛 山西省分析科学研究院  
莫佳峰 湖南省煤炭地质勘查院  
张卫国 西安科技大学地质与环境学院  
方世跃 西安科技大学地质与环境学院  
基金项目:国家自然科学基金项目(编号 41502160, 41802187)和西安科技大学优秀青年科技基金(编号 2019YQ2-08)
中文摘要:采用XRF、差热分析(DTA)、SEM、HRTEM、XRD和Raman光谱等表征手段对湖南寒婆坳矿区热变质煤的化学组分、物理性质、结构演化与其矿物学特征响应进行了研究。结果表明:岩浆侵入体的热力及构造应力作用促进煤化程度升高逐渐转变为隐晶质石墨,氢、碳原子数目比H/C逐渐降低,矿物主要为伊利石、绿泥石、叶蜡石、石英及黄铁矿等;随变质程度增加,真密度升高,孔隙度与电阻率降低;在400℃之后,失重曲线下降缓慢且斜率变小,显示深度裂解与脱落较少。d002、La、Lc的演化趋势呈非线性变化,显示煤有机大分子结构向石墨化演化的过程中呈现“跃变”;隐晶质石墨样品的晶体结构主要为2H型石墨结构,不同程度地含有3R多型,石墨化度为0.47~0.84,石墨晶体轴长a为0.2469~0.2471 nm,c为0.6738~0.6762 nm,晶胞体积V为0.03562~0.03570 nm3,显示靠近岩体晶胞体积减小;随着变质程度升高,La、Lc迅速增加,堆叠层数急剧增大,煤内部空间结构趋于有序化,拉曼参数AD1、P(G-D1)逐渐降低。
中文关键词:结构演化  隐晶质石墨  矿物学特征  热变质  湖南
 
Structural evolution and mineralogical characteristics of magmatic metamorphic coals in Hanpoao coal mining area, Hunan Province
Author NameAffiliationE-mail
Li Huantong College of Geology and Environment, Xi'
an University of Science and Technology 
htlcumt@126.com 
Wangnan Xi''an University of Science and Technology  
ZHU Zhirong College of Geology and Environment, Xi''an University of Science and Technology  
SHI Yuan Shanxi Academy of Analytical Sciences  
MO Jiafeng Academy of Coal Geological Survey of Hunan Province  
ZHANG Weiguo College of Geology and Environment, Xi''an University of Science and Technology  
Fang Shiyue College of Geology and Environment, Xi''an University of Science and Technology  
Abstract:To investigate the chemical constituents, physical property, structural evolution and mineralogical characteristics of magmatic metamorphic coal of hanpoao coal mining area in Hunan province, were characterized by XRF, DTA, SEM, HRTEM, XRD and Raman etc. analysis methods. The results show that the effect of magmatic thermal metamorphism and tectonic stress promoted the increasing degree of coalification to gradually transform into cryptocrystalline graphite; with the increase of coal rank, the ratio of hydrogen to carbon atoms in coals decrease; major mineral components in samples include illite, chlorite, pyrophyllite, quartz and pyrite. With the increase of the metamorphism degree, the true density increases and the porosity and resistivity decrease. After 400℃, the weight loss curve decreases slowly and the slope decreases, indicating less deep cracking and shedding. With the increase of coal rank, the stack height and diameter increase, the evolution of organic macromolecular structure of coal near the magmatic intrusion shows obvious jump; the graphite samples are mainly of 2H- graphite, and contains 3R- graphite to varying degrees; the graphitization degree is 0.47~0.84. The graphite crystal axial length a is 0.2469~0.2471 nm, c is 0.6738~0.6762 nm, and the crystal cell volume V is 0.03562~0.03570 nm3, indicating that the crystal cell volume near the rock mass decreases. With the increase of the metamorphic degree, La and Lc increased rapidly, and the number of stacked layers increased sharply. The internal spatial structure of coal tended to be orderly, and Raman parameters AD1 and P(G-D1) gradually decreased.
keywords:structural evolution  adiagnostic graphite  mineralogical characteristics  thermal metamorphism  Hunan Province
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