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. 2018 Mar 20;9:513. doi: 10.3389/fmicb.2018.00513

FIGURE 1.

FIGURE 1

Hypothetical transport of iron on early Mars. Reduced iron is released into aqueous environments by dissolution of ferrous minerals. This process could be accelerated by volcanic or impact-generated hydrothermal activity (McSween et al., 2009). Some dissolved iron may be photo-oxidized by solar UV radiation to ferric compounds and deposited as sediments (Nie et al., 2017).