Curious Mars

Volcanism on Mars controlled by early oxidation of the upper mantle

The compositions of the 3.7-billion-year-old surface rocks on Mars -- as observed by the Spirit rover at Gusev crater -- are shown to be consistent with early mixing of oxidized surface material into the uppermost Martian mantle: such oxidation appears to have had less influence on more recent volcanic rocks, which are sampled as Martian meteorites.

Full article in Nature

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