Fig. 3: Correlations among Ni isotopes, metal elements, and REY patterns in magnetite from the studied Sturtian iron formations.
From: Metal-driven anaerobic oxidation of methane and the Sturtian deglaciation
a–c, e, f Cross-plots of Ni, Co, Zn, and Mn contents, as well as Y/Ho ratios, versus δ60Ni, illustrating anticorrelations between these element contents and ratios and the δ60Ni values. d Plot of Dy/YbPAAS versus δ60Ni, demonstrating a positive correlation between Dy/YbPAAS ratios and δ60Ni values. Here, Dy/YbPAAS represents the ratio of middle rare earth elements (MREE) to heavy rare earth elements (HREE). Rare earth element data are normalized to post-Archean Australian shale (subscript PAAS). g Plot of Ni contents versus Dy/YbPAAS. An anticorrelation exists between Ni contents and MREE/HREE ratios. h, i Plots of Ni contents versus Co and Zn contents, showing positive correlations among the variables. Error bars for the δ60Ni data represent two standard deviations (2 SD).
