Explozivní vulkanismus na Venuši

Baranová, Anna

An Overview of Explosive Volcanism on Venus - Abstract In this thesis, I aim to provide an overview of explosive volcanism on Venus. The existence of explosive volcanism on Venus is uncertain. Despite unfavorable conditions of high atmospheric density and pressure that hinder explosive volcanic activity, as well as a planetary interior thought to be poor in volatiles that would enable fragmentation, evidence of in the form of putative surface expressions of explosive volcanism on Venus has been proposed - a putative pyroclastic flow deposit, Scathach Fluctus, and a series of locations of radar bright material, interpreted as the deposits of explosive volcanic activity. Numerical modeling of fragmentation and volcanic plume rise has shown that explosive volcanism would only be possible under very specific conditions of vent geometry and location, and magma volatile contents. While H₂O is likely acts as the main volatile on Venus, CO₂ and SO₂ are likely represented in higher percentages in the volatile fraction than on Earth, and hence can lower the required amounts of H₂O to values reasonable under Venusian conditions. If explosive volcanism does occur, it is constrained by the high pressure on the Venusian surface and is believed to exist in the form of pyroclastic density currents, rather than...

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