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Marine oxygen production and open water supported an active nitrogen cycle during the Marinoan Snowball Earth

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Figure

Fig. 1 Geologic setting and sample locations.Fransfontein section is from ref.beds without ice rafted debris or turbidites
Fig. 2 Geochemical results. Organic carbon (TOC), Al, Fe-speciation, Fe/Al, redox-sensitive trace element (TE), andare corrected for carbonate fraction (see text), all other data are whole rock
Fig. 3 Detrital input test using Al. Whole-rock analyses of redox-sensitive trace elements of interest, normalized to geochemically similar but redox-insensitive elements and plotted against Al
Fig. 4 Laser ablation results showing TE are contained in clay. Laser ablation ICP-MS analyses of carbonate-, clay-, and quartz-rich locations from allfound predominately in clay
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