Resurfacing Saturn's satellites - Models of partial differentiation and expansion

Mathematics – Logic

Scientific paper

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Computerized Simulation, Galilean Satellites, Planetary Geology, Satellite Surfaces, Tectonics, Ammonium Compounds, Enceladus, Freezing, Geological Faults, Icy Satellites, Mimas, Radii, Tethys, Thermal Expansion

Scientific paper

The faulting seen on the surfaces of Saturn's icy moons may have been caused either by external events, such as large impacts, or internal stresses caused by the expansion of the moons as long-lived radionuclides produced internal heating and phase changes. The author estimates the stress as a function of radius expansion to be σ = 44 (Δr/r) kbar. The extensional stress needed for fracture is probably something less than 40 bar. From his calculations the author concludes that the most reasonable cause for rifting on Dione and Rhea is the refreezing of an ammonia-water eutectic melt inside these moons roughly two billion years after their formation, while the rift on Tethys was caused by a large impact, and little rifting should be expected on Iapetus.

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