湖南寒婆坳矿区热变质煤结构演化及其矿物学特征响应
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本文为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)资助成果。


Structural evolution and mineralogical characteristics of magmatic metamorphic coals in the Hanpoao coal mining area, Hunan Province
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    摘要:

    采用X射线荧光光谱(XRF)、差热分析(DTA)、扫描电子显微镜(SEM)、高分辨透射电镜(HRTEM)、X射线衍射(XRD)和拉曼光谱(Raman)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。 d 002、 L a、 L c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, L a、 L c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 A D1、 P (G- D1)逐渐降低。

    Abstract:

    The chemical composition, physical property, structural evolution and mineralogical characteristics of magmatic metamorphic coal in the Hanpoao coal mining area of the Hunan Province were investigated by XRF, DTA, SEM, HRTEM, XRD and Raman analytical methods. The results show that the magmatic thermal metamorphism and tectonic stress promoted anincreasing degree of coalification that gradually resulted in transformation into cryptocrystalline graphite. With an increase of coal rank, the ratio of hydrogen to carbon atoms in coals decreased. The major mineral components in samples include illite, chlorite, pyrophyllite, quartz and pyrite. With an increase in the degree of metamorphism, 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 an increase of coal rank, the stack height and diameter increase, the evolution of organic macromolecular structure of coal near the magmatic intrusion shows an obvious jump; the graphite samples are mainly of 2Hgraphite, and contain 3Rgraphite in 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, L a and L c increased rapidly, and the number of stacked layers increased sharply. The internal spatial structure of coal tended to be orderly, and Raman parameters A D1 and P (G- D1) gradually decreased.

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李焕同,王楠,朱志蓉,石媛,莫佳峰,张卫国,方世跃.2020.湖南寒婆坳矿区热变质煤结构演化及其矿物学特征响应[J].地质学报,94(11):3503-3514.
LI Huantong, WANG Nan, ZHU Zhirong, SHI Yuan, MO Jiafeng, ZHANG Weiguo, FANG Shiyue.2020. Structural evolution and mineralogical characteristics of magmatic metamorphic coals in the Hanpoao coal mining area, Hunan Province[J]. Acta Geologica Sinica,94(11):3503-3514.

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  • 收稿日期:2019-08-23
  • 最后修改日期:2020-04-28
  • 录用日期:2020-05-08
  • 在线发布日期: 2020-05-10
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