Researchers find ancient, high-energy impacts could have fueled Venus volcanism swri NatureAstronomy
The geodynamics of Earth and Venus operate in strikingly distinct ways, in spite of their similar size and bulk density, resulting in Venus’s absence of plate tectonics and young surface age . Venus’s geophysical models have sought to explain these observations by invoking either stagnant lid tectonics and protracted volcanic resurfacing, or by a late episode of catastrophic mantle overturn.
These scenarios, however, are sensitive to poorly understood internal initial conditions and rheological properties, and their ability to explain Venus’s young surface age remains unclear. Here we show that long-lived volcanism, driven by early, energetic collisions on Venus, offers an explanation of its young surface age with stagnant lid tectonics. This volcanic activity is fuelled by a superheated core, resulting in vigorous internal melting regardless of initial conditions.
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