Extended Data Fig. 2: The relationship between Δ′17\({{\bf{O}}}_{{{\bf{O}}}_{{\bf{2}}}}\) and \({{\boldsymbol{p}}}_{{{\bf{O}}}_{{\bf{2}}}}/{{\boldsymbol{p}}}_{{{\bf{CO}}}_{{\bf{2}}}}\), as well as \({{\boldsymbol{p}}}_{{{\bf{O}}}_{{\bf{2}}}}\)/GPP, at steady state19. | Nature

Extended Data Fig. 2: The relationship between Δ′17\({{\bf{O}}}_{{{\bf{O}}}_{{\bf{2}}}}\) and \({{\boldsymbol{p}}}_{{{\bf{O}}}_{{\bf{2}}}}/{{\boldsymbol{p}}}_{{{\bf{CO}}}_{{\bf{2}}}}\), as well as \({{\boldsymbol{p}}}_{{{\bf{O}}}_{{\bf{2}}}}\)/GPP, at steady state19.

From: Two-billion-year transitional oxygenation of the Earth’s surface

Extended Data Fig. 2: The relationship between Δ′17 $${{\bf{O}}}_{{{\bf{O}}}_{{\bf{2}}}}$$ O O 2 and $${{\boldsymbol{p}}}_{{{\bf{O}}}_{{\bf{2}}}}/{{\boldsymbol{p}}}_{{{\bf{CO}}}_{{\bf{2}}}}$$ p O 2 / p CO 2 , as well as $${{\boldsymbol{p}}}_{{{\bf{O}}}_{{\bf{2}}}}$$ p O 2 /GPP, at steady state19.

It shows a general trend of increasing \({p}_{{{\rm{O}}}_{2}}\), which corresponds to the three major shifts in Δ′17Osulfate, highlighted by the circled numbers ‘1-3’ in Fig. 1b. The ultra-low, anomalous Δ′17Osulfate values observed immediately after the Marinoan could be associated with extremely high \({p}_{{{\rm{CO}}}_{2}}\) levels and potentially reduced GPP. PAL: present atmospheric level; GOE: Great Oxidation Event; GPP: gross primary productivity.

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