Chen Shancheng, Wu Dun, Liu Guijian, Sun Ruoyu
CAS Key Laboratory of Crust-Mantle Materials and Environment, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, Anhui 230026, China; Exploration Research Institute, Anhui Provincial Bureau of Coal Geology, Hefei, Anhui 230088, China.
CAS Key Laboratory of Crust-Mantle Materials and Environment, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, Anhui 230026, China; State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, The Chinese Academy of Sciences, Xi'an, Shaanxi 710075, China; Exploration Research Institute, Anhui Provincial Bureau of Coal Geology, Hefei, Anhui 230088, China.
Spectrochim Acta A Mol Biomol Spectrosc. 2017 Jan 15;171:31-39. doi: 10.1016/j.saa.2016.07.032. Epub 2016 Jul 19.
Normal burial metamorphism of coal superimposed by magmatic-contact metamorphism makes the characteristics of the Raman spectrum of coal changed. Nine coal samples were chosen at a coal transect perpendicular to the intrusive dike, at the No. 3 coal seam, Zhuji Coal Mine, Huainan Coalfield, China, with different distances from dike-coal boundary (DCB). Geochemical (proximate and ultimate) analysis and mean random vitrinite reflectance (R, %) indicate that there is a significant relationship between the values of volatile matter and R in metamorphosed coals. Raman spectra show that the graphite band (G band) becomes the major band but the disordered band (D band) disappears progressively, with the increase of metamorphic temperature in coals, showing that the structural organization in high-rank contact-metamorphosed coals is close to that of well-crystallized graphite. Evident relationships are observed between the calculated Raman spectral parameters and the peak metamorphic temperature, suggesting some spectral parameters have the potentials to be used as geothermometers for contact-metamorphic coals.
煤的正常埋藏变质作用叠加岩浆接触变质作用使煤的拉曼光谱特征发生变化。在中国淮南煤田朱集煤矿3号煤层，垂直于侵入岩脉的煤样剖面上选取了9个距岩脉-煤边界（DCB）距离不同的煤样。地球化学（工业分析和元素分析）分析以及平均随机镜质体反射率（R，%）表明，变质煤中挥发分含量与R值之间存在显著关系。拉曼光谱显示，随着煤变质温度的升高，石墨带（G带）成为主要谱带，而无序带（D带）逐渐消失，表明高变质接触变质煤的结构组织接近于结晶良好的石墨。计算得到的拉曼光谱参数与最高变质温度之间存在明显关系，表明一些光谱参数有潜力用作接触变质煤的地温计。
