Researchers Reconstructed Ancient Andean Landscape
A study analyzed volcanic deposits from 21.9 million years ago to uncover the history of mountain formation.
Updated on Sept. 21, 2026 in Geology
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Scientists reconstructed a landscape in the Andes that was buried 21.9 million years ago by the massive Lauca Caldera eruption. The findings suggest the mountain range experienced a slow and steady growth rather than a rapid uplift.
Why it matters
Understanding this formation process helps resolve a long-standing debate among geologists regarding whether the Andes rose steadily over 40 to 50 million years or experienced recent, sudden surges.
The study utilized computer simulations of river erosion patterns to map the terrain buried by a volcanic deposit reaching one kilometer in thickness. This deposit covered an area six times larger than modern-day Santiago.
The players
Science Advances
This is a peer-reviewed, open-access scientific journal that publishes significant research across all areas of science.
The details
By analyzing the shape of the volcanic blanket left by the Lauca Caldera, researchers determined that only landscapes with relatively low elevation differences could exist beneath the deposit. These models indicate a consistent uplift rate of 0.26 kilometers per million years, or 2.5 centimeters per century.
Timeline
The Lauca Caldera erupted and buried the ancient Andean landscape 21.9 million years ago.
The research findings were published in the journal Science Advances on September 11, 2026.
The Big Picture
This discovery shifts the trajectory of geological science by disproving the hypothesis of rapid Andean uplift. It provides a new framework for using volcanic blankets to bridge gaps in understanding long-term mountain formation.
While this geological reconstruction primarily informs scientific theory, the methodology could eventually aid in identifying buried natural resources or stable ground for future infrastructure. Applying these erosion models to other volcanic regions may improve our ability to predict landscape stability.
The takeaway
This study demonstrates that massive volcanic events can serve as geological time capsules for researchers. By examining these deposits, scientists are gaining a clearer picture of the slow, deliberate forces that shape our planet over millions of years.
Further reading
For more on the history of our planet's physical structure, visit the Geology section.
More information
Access the full Science Advances research publication for technical data.
Source note: This article includes information reported by SciTechDaily.
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