The Moon's Giant Volcanic Eruption
A team of astronomers and geologists, led by experts in the Institute for Computational Cosmology and Department of Earth Sciences at Durham University, UK, studied an area of the lunar surface in the Compton-Belkovich Volcanic Complex.
Image shows the area around the Compton-Belkovich Volcanic complex (with the vertical scale enhanced for clarity). The red region (approximately 35 km in diameter) is the volcanic complex and the green area is that containing the radioactive debris from the volcano’s eruption, which stretches 300 km to the east.
Credit: Jack Wilson et al, Durham University
The eruption, which happened 3.5 billion years ago, threw rock five times further than the pyroclastic flow of molten rock and hot gases that buried the Roman city of Pompeii, the researchers added.
The findings are being presented by lead author and Durham University PhD student Jack Wilson to the 46th Lunar and Planetary Science Conference in Texas tomorrow (Thursday, March 19, 2015).
The research used data from NASA’s Lunar Prospector spacecraft which first spotted the volcanic site in 1999 when it detected an isolated deposit of thorium on the Moon’s far-side between the Compton and Belkovich impact craters.
Image shows the area around the Compton-Belkovich Volcanic complex (with the vertical scale enhanced for clarity). The red region (approximately 35km in diameter) is the volcanic complex and the green area is that containing the radioactive debris from the volcano’s eruption, which stretches 300 km to the east.
Credit: Jack Wilson, et al, Durham University
Based on this information, the Durham-led team used a “pixon” image enhancement technique, originally designed to peer into the distant Universe, to sharpen the map and reveal the enormous size of the thorium deposit from the volcanic eruption.
Jack Wilson, a PhD student in Durham’s Institute for Computational Cosmology, said he was surprised by the gigantic scale of the explosion.
He said: “Volcanoes were common in the early life of the Moon and in fact the dark ‘seas’ you can observe on the lunar surface were created by runny, iron-rich, lava that flooded large areas, filling in impact craters and low-lying ground.
“Eruption of viscous, light-coloured, iron-poor, lava, which creates steep-sided volcanic cones, was rare and observed only at a handful of sites such as this one. The explosive eruption of such lava is unknown elsewhere on the Moon, making this volcano unique.
“By mapping the radioactive content of the lava from this volcano we have been able to show that molten, radioactive rock was thrown far beyond the slopes of the volcano, reaching several hundred miles in one direction.”
The research team is now planning to apply its mapping technique to the largest known volcano in the Solar system, Olympus Mons on Mars.
Rather than the radioactive element thorium, the researchers will be looking for hydrogen and the possible remnants of water ice from glaciers on the high slopes of the Red Planet.
The latest research used the DiRAC Data Centric system at Durham University, part of the DiRAC national supercomputing facility for research in astrophysics and particle physics funded by the Department for Business, Innovation and Skills through the Science and Technology Facilities Council and was supported by the Science and Technology Facilities Council and The Royal Society.
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