Mars Feldspar Rocks Suggested Hidden Carbonates
Geochemical simulations indicate that Martian groundwater likely sequestered carbonates deep underground.
Updated on Sept. 26, 2026 in Geology
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JAXA researchers have identified that feldspar-rich Martian rocks suggest substantial carbonate deposits are buried beneath the planet's surface. These findings, published in JGR Planets, challenge previous assumptions about the scarcity of carbonates on Mars.
Why it matters
Scientists have long puzzled over the lack of surface carbonates on Mars despite evidence of an early, wet environment. This research clarifies the discrepancy by showing how groundwater movement effectively transports and hides these minerals.
Simulations using PHREEQC Version 3 software demonstrate that groundwater is more efficient at carbonate formation than standing water. While feldspar makes up 60% of Earth's crust, the study focused on how it reacts to water percolation over 100,000-year cycles.
The players
JAXA
The Japan Aerospace Exploration Agency conducts space research and geochemical studies to understand planetary evolution.
The details
Researchers built one-dimensional thermochemical models to track how minerals alter as water moves through crustal rock. The study compared two mechanisms: diffusion in standing water versus downward percolation through groundwater flow. They found that groundwater dissolves carbonates near the surface and reprecipitates them in deeper strata, explaining their absence in surface observations.
Timeline
Billions of years ago, water actively interacted with rocks on the Martian surface.
The simulation episodes modeled mineral alteration over a duration of 100,000 years.
The Tech Race
This research shifts the focus from surface mineralogy to subsurface mapping for future robotic exploration. It aligns with broader efforts to identify evidence of a warmer, wetter Martian past.
These findings provide a clear target for future planetary drilling missions, narrowing down where to look for markers of ancient Martian water. Data from these simulated models will inform the landing site selection and tool requirements for upcoming probes.
The takeaway
The study confirms that carbonate scarcity on the surface does not mean the planet lacked water, but rather that geology buried the evidence. Watch for upcoming mission announcements regarding drilling capabilities designed for deep-crustal sampling.
What happens next
Future Mars missions are expected to conduct drilling operations into feldspar-rich terrain to verify the presence of these buried carbonate deposits.
Further reading
For more on the latest mineralogical investigations, explore our Geology section.
Source note: This article includes information reported by Universe Today.
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