A Deep-Mantle Garnet Might Hold the Secret to Ancient Martian Magma

A history of a planet’s volcanic activity is contained in its rocks. And Mars’ rocks – or at least many of the meteorites that have made the journey from it to Earth – were telling a contradictory story. They appeared to be highly oxidized, but our understanding of the internal volcanic forces on Mars meant that they should have been formed in a reducing environment – the exact opposite of what the chemical makeup of the rocks themselves indicate. Now,…

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