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Researchers from the University of Oxford published on June 26, 2026, in Nature Astronomy evidence that rewrites what we knew about the interior of Mars: the red planet hosted widespread deep magmatic systems as complex as those on Earth — despite never having had tectonic plates, the mechanism on Earth that generates and circulates magma through large igneous systems.
What are deep magmatic systems and why their absence on Mars was assumed
On Earth, tectonic plates are the engine of the magmatic system: they move, collide, subduct — and this process heats the mantle rock and causes it to melt, creating magma chambers that feed volcanoes, island arcs, and mountain chains. Without tectonic plates, the reasoning was that magma would not circulate in the same way.
Mars does not have tectonic plates. It has a single, rigid crust that covers the entire planet — a single “plate” without mobility. The dominant theory was that Martian volcanism was localized and relatively superficial, concentrated in regions like Tharsis (where Olympus Mons, the largest volcano in the solar system, is located) and fed by ascending magma plumes, not by distributed and complex magmatic systems like those on Earth.
What the Oxford researchers found contradicts this view.
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What the Nature Astronomy study revealed
Analyzing data from orbital missions and the InSight seismometer — which operated on Mars from 2018 to 2022 — the researchers identified evidence of deep magmatic systems that behaved very similarly to those on Earth. The seismic data, combined with geochemical models, revealed patterns that only make sense if Mars had deep magma chambers and reservoirs, with chemical differentiation — the process by which magma separates into denser and less dense components over time.
Deep magmatic differentiation is a hallmark of Earth’s large igneous systems — like the chambers that feed Yellowstone, the lava rivers of Iceland, or the large flood basalts that covered parts of Siberia and the Deccan. The fact that the same process occurred on Mars, without the tectonic engine, suggests that there are alternative mechanisms of mantle heating and circulation that do not depend on plates.
This fundamentally changes how we think about the geological evolution of Mars — and opens a new window to understand the hot past of the red planet.
Why this matters for the search for life
Where there is geological heat and fluid circulation, there is potential for habitability. On Earth, geothermal systems associated with deep magmatism — where groundwater heated by magma circulates through fractures in the rock — are environments where life thrives, even without sunlight. The deep ocean hydrothermal vents, fed by magmatic heat, host entire ecosystems.
If Mars had deep magmatic systems comparable to those on Earth, it may also have had subsurface hydrothermal systems that persisted long after the Martian surface dried and cooled. This expands the potential habitability window of Mars beyond what previous estimates — based solely on the presence of surface water 3-4 billion years ago — suggested.
Future missions to Mars — including the Mars Sample Return, which will bring samples from Jezero Crater for analysis on Earth — may find chemical signatures of ancient hydrothermal activity that only make sense if there were deep magmatic systems operating in the past. The Oxford discovery recontextualizes what scientists will look for in the samples.
Mars as a mirror of Earth and what to learn from it
Mars is, in many ways, a natural laboratory to understand what happens to an Earth-like planet when it loses internal heat and its magnetic field. Four billion years ago, Mars had a denser atmosphere, oceans, or seas of liquid water, and possibly conditions for life. Then the magnetic field disappeared, the solar wind eroded the atmosphere, and the surface dried up.
What the Oxford study adds is that, for longer than previously thought, Mars continued to be geologically active in depth — simmering inside while its surface was already cooling. This prolonged internal heating may have sustained subsurface habitable environments for hundreds of millions of years beyond previous estimates.
I wonder what scientists will find in the Jezero samples if the evidence of magmatic hydrothermalism is confirmed. It is a planet that underwent a transformation that Earth might also undergo — and studying Mars is, in part, understanding our own distant geological future.
The Oxford discovery also has implications for how we think about habitability on other planets and moons in the solar system that do not have tectonic plates. Titan, Saturn’s moon, has a rigid lithosphere. Europa, Jupiter’s moon, likely does too — but has a liquid ocean under the ice fed by tidal heat. The idea that complex deep magmatic systems only exist on planets with plate tectonics limited the set of worlds that could have sustained conditions for life. If Mars — which clearly does not have tectonic plates — had complex igneous systems and potentially hydrothermal circulation for billions of years, the principle expands: maybe Mars was not the only case. Perhaps there are other worlds with static lithospheres that still retain enough heat and geological activity to create and sustain habitable niches for a long time. The June 26 Nature Astronomy is not just about Mars — it’s about what counts as a necessary condition for life in the universe.
If Mars simmered inside much longer than we imagined, are the chances of it having hosted life at some point in its history greater or lesser than we believed?
