Tartèse et al. Warm Archaean oceans reconstructed from oxygen isotope composition of early-life remnants Figure 2 (a) Comparison of the chert and calculated.

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Tartèse et al. Warm Archaean oceans reconstructed from oxygen isotope composition of early-life remnants Figure 2 (a) Comparison of the chert and calculated seawater O isotope composition evolution through time, calculated using a Δ18Okerogen-water of 20 ± 4 ‰. Errors bars correspond to the propagated uncertainties on calculated δ18Owater (including the standard deviation – 1 SD – on average kerogen δ18O values and the uncertainty of ±4 ‰ on Δ18Okerogen-water). The horizontal blue band represents a constant δ18Oseawater of 0 ± 2 ‰ through time. (b) Estimates of water T calculated using (i) the available maximum δ18Ochert value (to which 3 ‰ has been added to take into account possible effects induced by diagenesis – see Supplementary Information) per 50 Ma age intervals and using δ18Oseawater = 0 ± 2 ‰, (ii) the chert δ30Si record (Robert and Chaussidon, 2006) and (iii) resurrected proteins of ancient bacteria (Gaucher et al., 2008). Estimates of the surface of emerged land through time are also shown (Flament et al., 2013). Vertical grey bars running across both panels correspond to the major glaciation events identified in the geological record (after Hambrey and Harland, 1985, Evans et al., 1997 and Young, 2014). Figure 2 (a) Comparison of the chert and calculated seawater O isotope composition evolution through time, calculated using a Δ18Okerogen-water of 20 ± 4 ‰. Errors bars correspond to the propagated uncertainties on calculated δ18Owater (including the standard deviation – 1 SD – on average kerogen δ18O values and the uncertainty of ±4 ‰ on Δ18Okerogen-water). The horizontal blue band represents a constant δ18Oseawater of 0 ± 2 ‰ through time. (b) Estimates of water T calculated using (i) …. Tartèse et al. (2017) Geochem. Persp. Let. 3, 55-65 | doi: 10.7185/geochemlet.1706 © 2017 European Association of Geochemistry