Table of Contents
Journal of Geological Research
Volume 2012, Article ID 590857, 8 pages
Research Article

FTIR and Raman Spectral Research on Metamorphism and Deformation of Coal

1Key Laboratory of Computational Geodynamics, College of Earth Science, Graduate University of Chinese Academy of Sciences, Beijing 100049, China
2State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum, Beijing 102249, China
3Key Lab of Basin Structure and Petroleum Accumulation, PetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, China

Received 13 January 2012; Revised 17 April 2012; Accepted 17 April 2012

Academic Editor: Hongyuan Zhang

Copyright © 2012 Xiaoshi Li et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Under different metamorphic environments, coal will form different types of tectonically deformed coal (TDC) by tectonic stress and even the macromolecular structure can be changed. The structure and composition evolution of TDC have been investigated in details using Fourier transform infrared spectroscopy and Raman spectroscopy. The ductile deformation can generate strain energy via increase of dislocation in molecular structure of TDC, and it can exert an obvious influence on degradation and polycondensation. The brittle deformation can generate frictional heat energy and promote the metamorphism and degradation, but less effect on polycondensation. Furthermore, degradation affects the structural evolution of coal in lower metamorphic stage primarily, whereas polycondensation is the most important controlling factor in higher metamorphic stage. Tectonic deformation can produce secondary structural defects in macromolecular structure of TDC. Under the control of metamorphism and deformation, the small molecules which break and fall off from the macromolecular structure of TDC are replenished and embedded into the secondary structural defects preferentially and form aromatic rings by polycondensation. These processes improved the stability of macromolecular structure greatly. It is easier for ductile deformation to induce secondary structural defects than in brittle deformation.