Fig. 2: Fe and Ni isotope systematics in magnetite and hematite from the studied Sturtian iron formations. | Nature Communications

Fig. 2: Fe and Ni isotope systematics in magnetite and hematite from the studied Sturtian iron formations.

From: Metal-driven anaerobic oxidation of methane and the Sturtian deglaciation

Fig. 2

a Variations in Fe isotope compositions between coexisting hematite and magnetite, highlighting distinct trends that delineate diverse pathways of magnetite formation30. The Fe isotope fractionations for equilibrium hematite and magnetite formation are illustrated in blue30,107. The gray line labeled “1:1” represents the origin of magnetite through the in-situ dissimilatory iron reduction (DIR) of the common precursor Fe(OH)322,27. b, c Cross-plots of δ60Ni versus δ56Fe values for magnetite samples. Plot (c) displays average δ60Ni and δ56Fe values. The δ60Ni and δ56Fe values of magnetite exhibit a positive correlation. Error bars for the δ56Fe and δ60Ni data represent two standard deviations (2 SD).

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