Young magmas on the moon came from much shallower depths than previously thought, new study finds
New research on the rocks collected by China’s Chang’e 5 mission is rewriting our understanding of how the moon cooled. Stephen Elardo, Ph.D., an assistant professor of Geological Sciences with the University of Florida, has found that lava on the near side of the moon likely came from a much shallower depth than previously thought, contradicting previous theories on how the moon produced lavas through time.
These samples of basalt, an igneous rock made up of rapidly cooled lava, were collected from the near side of the moon by the Chang’e 5 mission and are the youngest samples collected on any lunar mission, making them an invaluable resource for those studying the geological history of the moon.
In order to get an estimate of how deep within the moon the Chang’e 5 lava came from, the team conducted high-pressure and high-temperature experiments on a synthetic lava with an identical composition. Previous work from Chinese scientists has determined that the lava erupted about 2 billion years ago and remote sensing from orbit has showed it erupted in an area with very high abundances of potassium, thorium and uranium on the surface, all of which are radioactive and produce heat. Scientists believe that, in large amounts, these elements generate enough heat to keep the moon hot near the surface, slowing the cooling process over time.
