Viscoelestic Behaviour of Basaltic Melts
The range of viscoelastic behavior of basaltic (silicate) melts affects whether or not the magma undergoes brittle fragmentation prior to eruption, and therefore controls the eruption style and related hazards. High-temperature rheology measurements performed in oscillatory mode allow us to precisely constrain this range
This report shows how the FRS 1800 concentric cylinder rheometer from Anton Paar can be used to determine the rheological behavior of silicate melts of geological interest, in particular volcanic basaltic melts. For volcanic melts, solid-state behavior may play an important role in conduit dynamics and eruption style by controlling the conditions under which magma can undergo brittle fragmentation (Dingwell, 1996). This is of particular interest for eruptions that are anomalously explosive despite involving relatively low-viscosity magmas, such as explosive basaltic eruptions (e.g. Moitra et al., 2018).
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