14 Settembre, 2022, ore 11:00
Speaker: David Rothery da The Open University di Milton Keynes, UK
Abstract: Mercury’s volcanic activity has decreased over time, but probably continued into the geologically recent past. Most of the planet’s surface consists of multiple generations of lava flows. These were erupted in greatest volumes before 3.5 billion years ago, but smaller flow units within <200 km craters, or ponded against fault scarps may be much younger. Explosive volcanic eruptions (thanks to the planet’s surprising richness in volatiles) have ripped km-deep holes in the surface, and some of these may be less than 100 million years old.