Figure 5 | Scientific Reports

Figure 5

From: Widespread abiotic methane in chromitites

Figure 5

Examples of chemisorbed CH4 detected by Raman analyses on chromitites. (a) Confocal Raman imaging of a fresh fracture surface of chip sample AET5; (a1) map of lizardite peak at 690 cm−1; (a2) map of CH3 symmetric vibration at 2938 cm−1; (a3) overlay image of a1 and a2 as a red (lizardite), green (CH3) composite. (a4) Lizardite spectra (yellow area in a3) with the D and G bands of amorphous carbon and the CH stretching region. (b) Raman spectral image in correspondence with a fracture in AET1 thin section showing the distribution of chemisorbed CH4 (green) and main mineral (blue); (c) profile of calibrated chemisorbed CH4 along fractures in AET1.

Back to article page