Fig. 5 Mn content vs. Mn/Fe ratio of manganese nodule in this study. Data from the Cook Island (Hein et al., 2015), Peru Basin (Wegorzewski and Kuhn, 2014), and Baltic Sea (Bogdanov et al., 1995; Glasby et al., 1997; Szamalet et al., 2018) are plotted for comparison.

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