Science Advances

Supplementary Materials

This PDF file includes:

  • fig. S1. Simplified schematic representation of the major source and sinks of U in the modern ocean along with their isotopic compositions (sources) or associated isotopic fractionations (sinks) modified after Tissot and Dauphas (54) and Wang et al. (55).
  • fig. S2. Geochemical profiles for the study sections.
  • fig. S3. Petrographic images of the Hamajing Member.
  • fig. S4. Petrographic images of the Shibantan Member.
  • fig. S5. Petrographic images of the Baimatuo Member and the Yanjiahe Formation.
  • fig. S6. Chemostratigraphic profiles of δ238U, Sr content, Mn content, Mn/Sr ratio, and δ18O for the study sections.
  • fig. S7. Chemostratigraphic profiles of δ238U, Mn/(Mg + Ca) ratio, and Sr/(Mg + Ca) ratio for the study sections.
  • fig. S8. Cross-plots of δ13C-δ18O for the study sections.
  • fig. S9. Chemostratigraphic profiles of δ238U, Al content, Rb/Sr ratio, U/Al ratio, and Mg/Ca molar ratio for the study sections.
  • fig. S10. Chemostratigraphic profiles of U and Mo concentrations, Ce anomalies, U/(Mg + Ca) ratio, and Mo/(Mg + Ca) ratio for the study sections.
  • fig. S11. Mass balance modeling calculations show variations of seawater δ238U values as a function of anoxic/euxinic seafloor area while keeping Δanoxic constant (+0.6‰) and testing various suboxic areal extents.
  • fig. S12. Calculated combination fanoxic and fsuboxic to account for latest Ediacaran seawater average δ238U of −0.95‰.
  • table S1. The sample-dissolving procedure.
  • table S2. Cross-correlation coefficients (R2) and P values calculated to test the influence of diagenetic indicators on δ238U (confidence interval, 95%).
  • table S3. Summary of the parameters used in the modeling excise.
  • References (54–100)

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Other Supplementary Material for this manuscript includes the following:

  • database S1 (Microsoft Excel format). δ238U data with associated geochemical data at the Wuhe section.
  • database S2 (Microsoft Excel format). δ238U data with associated geochemical data at the Gaojiashan section.
  • database S3 (Microsoft Excel format). Analytical results of standard summary (Wuhe measurements).
  • database S4 (Microsoft Excel format). Analytical results of standard summary (Wuhe measurements).

Download Tables S1 to S8

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