Numerical modelling of magma transport in dykes

摘要: The rheology and dynamics of an ascending pure melt in a dyke have been extensively studied the past. From field observations, it is apparent that most dykes actually contain crystalline load. presence load modifies effective such system thus flow behaviour. Indeed, higher density viscosity each crystal, compared to melt, cause decrease ascent velocity modify shape profile, from typical Poiseuille flow, Bingham-type flow. A common feature observed arrangement crystals parallel or at very low angle edge dyke. Such structural often interpreted as result magma which caused rotate align within direction, but this process remains unclear. Another issue related introduction concerns possibility for be segregated viscous granitic phase during ascent. implications on magmatic differentiation not previously considered, nor has investigated via numerical models. In study, we examine crystal bearing our models, both phases are represented highly fluids Stokes regime. Our results reveal profile across Furthermore, observe whilst continually shear over one period revolution, their major axis high probability aligned direction. Moreover, some experiments showed can effectively squeezed out crystal-rich when subjected given pressure gradient range. This demonstrates crystal-melt segregation constitutes viable mechanism differentiation.