Focused flow during the formation and propagation of sills: Insights from analogue experiments
- Williams, KM
- Kavanagh, JL
- Dennis, DJC
DOIAbstract
Geophysical observations of sills suggest magma can be transported hundreds of kilometres within these thin (<100 m thick) horizontal sheet-like bodies. However, existing magma flow models struggle to explain how sills propagate so extensively. We conducted scaled analogue experiments to explore the dynamics of magma flow in sills. Two fluids (magma analogues) with different rheology (water, a Newtonian fluid, or xanthan gum, a shear-thinning fluid) were injected through the base of a clear-Perspex tank that contained two superposed gelatine layers with contrasting stiffness and a weakly bonded interface (crustal analogue). To visualise and map fluid flow over time, we applied particle image velocimetry to passive tracer particles that fluo...
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