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Fig. 7 | Progress in Earth and Planetary Science

Fig. 7

From: FTIR microspectroscopy of carbonaceous matter in ~ 3.5 Ga seafloor hydrothermal deposits in the North Pole area, Western Australia

Fig. 7

R3/2 values of the extant prokaryotes, experimentally maturated cyanobacteria, and the carbonaceous clots. a R3/2 values of the extant bacterial and archaeal cells and lipids (data from Igisu et al. 2012) together with the standard n-alkane samples (n-C10 and n-C18) (data from Igisu et al. 2009). The R3/2 values for the representative extant untreated bacterial and archaeal cells range from 0.59 ± 0.01 to 0.70 ± 0.01 and from 0.86 ± 0.04 to 0.95 ± 0.02, and those for bacterial and archaeal lipids range from 0.31 ± 0.09 to 0.41 ± 0.01 and from 0.51 ± 0.05 to 0.67 ± 0.08, respectively. b Results of the heating experiments for the non-embedded and silica-embedded cyanobacterial cells (modified from Igisu et al. 2009, 2018). The R3/2 values for the heated samples are plotted against the heating temperature. All the experimental run products of the silica-embedded samples were obtained after heating for 600 min except the one indicated by a number (the sample marked was heated for 442 min). Others were obtained after heating for 300 min except the one indicated by a number (the sample marked was heated for 600 min). c R3/2 values of the carbonaceous clots obtained from the Dresser Formation together with the Proterozoic prokaryotic fossils and carbonaceous matter (CM) in stromatolite. The error bars for the carbonaceous clots indicate the standard deviations of the duplicate measurements. The data for Bitter Springs and Gunflint samples were obtained from Igisu et al. (2009), and that for Wumishan sample was obtained from Qu et al. (2015)

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