Scientists studying the 2021 eruption of Tajogaite on La Palma have discovered that magma superheating can delay crystal formation, allowing molten rock to rise faster and fuel spectacular lava fountains.
- Superheated magma dissolves crystal seeds, delaying crystallization.
- Fluid magma rises faster, promoting dramatic lava fountains.
- Findings may improve eruption forecasts and hazard assessments.
What happened
An international team led by The University of Manchester analyzed magma samples from the 2021 Tajogaite eruption on La Palma, Spain. Using advanced X-ray imaging techniques, they observed how magma behaves when it becomes superheated—heated beyond temperatures where crystals usually remain stable. This superheating dissolves microscopic crystals and prevents new ones from forming quickly, keeping the magma more fluid as it moves upwards through the Earth's crust.
Experiments recreated the high-pressure, high-temperature conditions inside a volcano, capturing real-time crystal formation with synchrotron X-ray microtomography. The researchers found a striking difference: magma that wasn’t superheated began crystallizing after about 20 minutes, while superheated magma delayed crystal growth for over eight hours. Computational models then showed how this delay affects eruption style, with superheated magma rising faster and fueling explosive lava fountains.
Why it feels good
Discovering the role of superheating fills a key gap in understanding volcanic eruptions, explaining why volcanoes with similar chemistry can erupt so differently. The findings highlight how subtle thermal history changes inside magma chambers shape the nature of volcanic activity—from gentle lava flows to spectacular fountains of molten rock.
This new perspective offers volcanologists improved tools to interpret eruption signals based not just on chemistry and gas content but also on the magma’s temperature history and crystallization behavior. Ultimately, a better grasp of these processes enhances our ability to forecast eruptions and prepare communities potentially affected by volcanic hazards.
What to enjoy or watch next
Keep an eye on ongoing volcanic monitoring efforts worldwide, where this research could help refine eruption predictions. The study’s innovative approach using X-ray microtomography to watch magma ‘live’ inside the lab marks a promising path for future investigations into volcanic processes under extreme conditions.
For those fascinated by volcano science, follow updates from The University of Manchester and collaborating institutions as they continue exploring magma dynamics. Their work bridges advanced experimental techniques and real-world geological hazards, offering fresh insights into some of Earth’s most powerful natural phenomena.