EGS Lectures 2024/25: Ri Cao Volcanoes on Venus
Автор: Edinburgh Geological Society
Загружено: 2024-10-31
Просмотров: 75
School of GeoSciences early career researchers
Ri Cao, PhD student: Volcanoes on Venus
Venus is widely regarded as Earth’s ‘sister’ planet, given their similarity in size, mass, density, and chemical composition. Steep-sided domes are prominent volcanic landforms on Venus that are postulated to require the eruption of highly viscous magma. They are pivotal in (1) understanding the range of magmatic processes operating on Venus and (2) elucidating the geological evolution of stagnant lid regime planets. Despite their significance, there are still considerable debates regarding their formation mechanisms (SiO2-rich or crystal-rich). In this study, I have investigated potential mechanisms for the formation of Venusian domes by constraining the viscosity of liquids formed by batch melting (BM) of Venusian crust or by fractional crystallisation (FC) of primary magmas using thermodynamic modelling rhyolite-MELTS software. My results indicate that high crystallinity magmas are required to generate sufficient high viscosity to account for the formation of steep-sided domes.
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