Figure 8: C-XANES spectra of Gunflint organic microfossils. | Nature Communications

Figure 8: C-XANES spectra of Gunflint organic microfossils.

From: Molecular preservation of 1.88 Ga Gunflint organic microfossils as a function of temperature and mineralogy

Figure 8

The C-XANES spectra of modern cyanobacteria (G. violaceus) and of modern micro-algae (E. gracilis) are shown for comparison. All spectra are normalized to the total carbon quantity. Absorption features at 285.1, 286.4, 286.7, 288.2, 288.6, 289.4 and 290.3 eV are attributed to electronic transitions of aromatic and/or olefinic carbons, carbons bonded with heteroatoms, carbonyl or phenolic groups, amide groups, carboxylic groups, hydroxylated carbons and carbonate groups, respectively.

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