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SUMMARY:Multiphase Flow in Crustal Magmatic Processes - Joe Dufek (Georgia
  Institute of Technology)
DTSTART:20160218T160000Z
DTEND:20160218T170000Z
UID:TALK64722@talks.cam.ac.uk
CONTACT:INI IT
DESCRIPTION:Multiphase dynamics in crustal magmatic processes have analogy
  with many processes occurring in the mantle and span phenomena from slow\
 , dense granular flows to rapidly shearing granular flows during volcanic 
 eruptions. In this talk I will discuss these two end-members in the contex
 t of magma chamber dynamics and eruptive dynamics. In the magma dynamics c
 ase\, the efficiency of the relative motion between melt and crystals prod
 uces distinct compositional trends that can be compared with the chemistry
  of melts and phase equilibria. This work will consider differentiation sc
 enarios in both simplified magma reservoir geometries and those that are e
 mergent with the successive input from intrusions in an open system. Evide
 nce of open systems and assembly of magmatic systems incrementally are pre
 sent in a range of plutonic and volcanic rocks. To evaluate the timescales
  of silicic magma production\, a multiphase dynamics model will be discuss
 ed that includes heat transfer\, phase equil ibria and relative motion bet
 ween a melt and several crystal phases. A particular focus of this present
 ation is a comparison of dynamic processes to proxies used as chronometers
 .  The other end-member considered are flows produced during explosive eru
 ptions. During explosive eruptions the interstitial fluid is often a gas a
 nd the granular flow has significant inertia. I will compare and contrast 
 granular stress concentration\, entrainment\, and fluid expulsion in this 
 regime as well as discuss the prospects for integrating a range of laborat
 ory experimental and numerical approaches.
LOCATION:Seminar Room 1\, Newton Institute
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