Based on the evolution of the atmosphere-surface-interaction of Mars, one might expect a large oxygen surface sink over geologic time-scales. Due to intense oxidation of inorganic matter this led to the formation of considerable amounts of sulfates and ferric oxides on Mars. To model this effect several factors have to be under consideration: Inorganic composition of the Martian soil, amount of incorporated oxygen, meteoritic gardening, and the oxidant extinction depth. The oxygen incorporation has further implications for the assumed oxidant extinction depth, which is an important parameter to determine required sampling depths on Mars to find putative organic material.

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Conference Proceedings of the Second European Workshop on Exo-Astrobiology
Citation
Kolb, C. (C.), Lammer, H. (H.), Abart, R. (R.), Ellery, A, Edwards, H.G.M. (H. G M), Cockell, C.S. (C. S.), & Patel, M.R. (M. R.). (2002). The Martian oxygen surface sink and its implications for the oxidant extinction depth. In European Space Agency, (Special Publication) ESA SP (pp. 181–184).