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SUMMARY:Ed Hinton -Injection of a fluid into a confined aquifer with a ver
 tical gradient of permeability. Alex Gutai - Formation and eruption of sil
 icic magmas by crustal melting. - Edward Hinton\, BP Institute and Alex Gu
 tai\, BP Institute
DTSTART:20180524T103000Z
DTEND:20180524T113000Z
UID:TALK104917@talks.cam.ac.uk
CONTACT:Catherine Pearson
DESCRIPTION:Ed Hinton -Injection of a fluid into a confined aquifer with a
  vertical gradient of permeability\n\nWe consider the flow of viscous flui
 d in a confined horizontal aquifer. The novel feature of the analysis is t
 hat we allow the permeability to vary vertically across the aquifer. We sh
 ow that\, depending on the magnitude of the permeability gradient across t
 he formation\, the structure of the front may involve shocks of constant s
 hape\, a spreading rarefaction type wave\, or a mixture of the two. The cl
 assical solutions in a two-dimensional aquifer of constant permeability in
  which there is no viscosity ratio between the fluids lead to an interface
  which spreads laterally at a rate proportional to t^(1/2). However\, thes
 e solutions are unstable to cross-layer variations in the permeability owi
 ng to the vertical shear which develops in the flow\, causing the structur
 e of the interface to evolve to the rarefaction wave or shock-like structu
 re. We consider the implications of our results for the prediction of stor
 age efficiency during CO2 sequestration.\n\nAlex Gutai - Formation and eru
 ption of silicic magmas by crustal melting.\n\nAn intrusion of hot mafic m
 elt into continental crust may cause partial melting of the surrounding cr
 ust and formation of an overlying silicic magma body. This process has bee
 n modelled using idealised fluid dynamic and heat transfer arguments\, bui
 lding on the previous work of Huppert and Sparks (1988). Thermal and physi
 cal evolution of the system are modelled and processes such as overturn an
 d/or mingling of magmas are predicted. This model has been applied in the 
 context of the El Hoyazo eruption in SE Spain\, using MELTS modelling to h
 elp constrain how the composition and physical properties of the magmas ch
 ange with temperature. Current work involves analogue experiments to gain 
 insight into roof melting\, crystal sedimenting and magma mingling process
 es.\n\n\n
LOCATION:Open Plan Area\, BP Institute\, Madingley Rise CB3 0EZ
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