Researchers from the University of Oxford have identified evidence of enormous, interconnected magmatic systems deep beneath the surface of Mars, indicating the planet once possessed a more complex geological structure than previously understood. The findings, published in the journal Nature Astronomy on 26 June 2026, were derived from seismic data collected by NASA’s InSight mission between 2018 and 2022.
Geological Findings And Seismic Evidence
The study reveals that these ancient magma channels are located at a boundary approximately 24 kilometres beneath the Martian crust. By analysing seismic waves generated by meteoroid impacts and marsquakes, scientists confirmed the presence of transcrustal magmatic systems that allowed for the circulation and chemical evolution of molten rock.
The findings challenge one of the long-standing assumptions in planetary science and suggest that rocky planets may be able to build complex crust, and potentially environments favourable for life, without following Earth’s geological blueprint.
Implications For Planetary Science
Mars has traditionally been categorised as a ‘stagnant lid’ planet because it lacks the active plate tectonics that play a critical role in cooling and recycling Earth’s crust. This discovery suggests that Mars utilised alternate pathways for thermal and chemical regulation, which may have contributed to a more hospitable environment in the planet’s distant history.
Future exploration missions and follow-up analysis of the remaining InSight datasets are expected to further clarify the duration and impact of these magmatic events. As researchers continue to model these internal structures, the scientific community aims to determine how extensively these systems influenced the Martian atmosphere and surface composition.