A volcano has erupted remnants of Earth's primordial magma ocean
Earth was once covered by a global magma ocean, which later cooled and crystallised – now traces of this primordial event have been found in magma from a young volcano in the Indian Ocean
Earth was once covered by a global magma ocean, which later cooled and crystallised – now traces of this primordial event have been found in magma fro
Read Full Story at New Scientist →Why This Matters
This discovery offers a rare glimpse into Earth’s violent infancy, when collisions with protoplanets and radioactive decay generated a planet-wide sea of molten rock. Understanding these primordial remnants could redefine models of planetary formation, crustal evolution, and even the conditions that set the stage for life’s emergence.
Background Context
Earth’s last magma ocean likely solidified over 4 billion years ago, but geochemical traces of this era were thought to be lost to tectonic recycling. The volcano on the island of Mayotte, part of the Comoros archipelago, is unusually young—formed just 10,000 years ago—making it an unexpected window into the planet’s deepest past.
What Happens Next
Researchers will now scrutinize similar volcanic systems for comparable signatures, potentially mapping the global distribution of these primordial relics. If confirmed in other regions, the findings may force revisions to theories about the timing of Earth’s first stable continents and the role of magma oceans in shaping habitable worlds.
Bigger Picture
This discovery aligns with a growing focus on "deep time" geology, where modern eruptions become messengers from Earth’s earliest chapters. It also underscores how Earth’s dynamic interior—long assumed to have erased all traces of its violent youth—still harbors secrets from its molten dawn.
