Fig. 5: Lead enrichment profile correlations to regional pollution lead references.
From: Centennial to millennial-scale paleoenvironmental record from a coastal iron-manganese concretion
Lead enrichment (EFPb) profile of a Gulf of Finland iron-manganese concretion (MGBC-2021-4-1) compared to pollution Pb reference curves from Swedish lakes Kassjön, Koltjärnen, and Kalven61,62, and from Haverö in the Archipelago Sea area, eastern Baltic Sea8. A detailed inset of unfiltered EFPb data is shown from the outermost ~100 µm of the concretion and compared to Kassjön pollution Pb. In the inset, the 1900 minima and the leaded gasoline peak of 1980 are indicated.
