Fig. 3: Comparison between the downcore profiles of reactive iron (FeR)13 and the results of the sequential iron extraction75.
From: Millennial scale persistence of organic carbon bound to iron in Arctic marine sediments
The three iron phases from the sequential iron extraction, shown by black circles, triangles and squares, are: Fe bound to carbonates or very labile iron oxides (FeOx-1); poorly crystalline Fe (oxyhydr)oxides like ferrihydrite (FeOx-2) and crystalline Fe (oxyhydr)oxides such as hematite and goethite (FeOx-3). Blue bars indicate the sum of FeOx1–3 which shows that the dithionite extraction of FeR (orange dots) represents the entire reactive iron pool. The grey hatched area (B15) indicates a pink, iron-rich sediment layer, which is enriched in more crystalline iron phases (FeOx-3).
