Fig. 1: Redox state of Archean Basalt-1 (B-1) samples calibrated by the updated V-Ti redox proxy. | Nature Communications

Fig. 1: Redox state of Archean Basalt-1 (B-1) samples calibrated by the updated V-Ti redox proxy.

From: Oxidation of Archean upper mantle caused by crustal recycling

Fig. 1

a The fO2 estimations of B-1 samples. The fO2 values and respective uncertainties (grey intervals) of Archean mid-ocean ridge basalt (MORB)-like samples estimated by V-Sc redox proxy and modern MORBs by V-Ti redox proxy were used for comparison1,8,14. The uncertainties in the bottom right corner represent the average 1 standard deviation (SD) propagation of B-1 samples. b–d The time evolution of fO2 estimations and Th/Nb ratios in the North China, Yilgarn and Pilbara cratons, respectively. The grey symbols are the corresponding Th/Nb ratios of B-1 samples. Error bars show the 1 SD of the means.

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