In situ Raman spectroscopy on kerogen at high temperatures and high pressures |
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Authors: | En-Ping Huang Eugene Huang Shu-Cheng Yu Yen-Hua Chen Jiann-Shing Lee Jiann-Neng Fang |
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Institution: | (1) Department of Earth Sciences, National Cheng Kung University, No. 1, University Road, 701 Tainan, Taiwan;(2) Center for General Education, Chung-Chou Institute of Technology, Chang-Hua, Taiwan;(3) Department of Applied Physics, National Pingtung University of Education, Pingtung, Taiwan;(4) Department of Collection Management, National Taiwan Museum, Taipei, Taiwan; |
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Abstract: | Kerogen samples were treated at temperatures and pressures up to 25–600°C and ~9 GPa, respectively. In situ micro-Raman spectroscopy
was used to measure the systematic changes in the first-order Raman spectral features during the process of temperature or
pressure increment. Three Raman bands, D1, D2, and G bands, were examined to characterize the structural and chemical changes
of kerogen at high temperatures and pressures. We found that the wavenumbers of D1, D2 and G bands showed a linear variation
with both temperature and pressure. Therefore, a correlation between R1 and R2 and the peak temperature in regionally metamorphosed
rocks cannot be applied to this work. This result implies that the G band may serve as a temperature or pressure indicator
during the promotion of maturation of kerogen. Kerogen possesses reversible properties in contrast with the natural samples
recovered from the field suffered from prolonged thermal history during regional metamorphism. |
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