Fig. 4: Concretion lead enrichment and isotopic composition. | Communications Earth & Environment

Fig. 4: Concretion lead enrichment and isotopic composition.

From: Centennial to millennial-scale paleoenvironmental record from a coastal iron-manganese concretion

Fig. 4

Iron to manganese (Fe/Mn) ratio, Pb content, lead enrichment (EFPb), 206Pb /207Pb and 208Pb /207Pb ratios from the outer edge next to the core of a Gulf of Finland iron-manganese concretion (MGBC-2021-4-1). Identified anthropogenic lead peaks are indicated in the figure from I to IV. The orange line is LOWESS fit of the data.

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