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SUMMARY:The interplay of stress and chemical processes in rocks: why it ma
 tters\, what is explained\, and some unsolved problems - Professor John Wh
 eeler\, University of Liverpool
DTSTART:20191121T113000Z
DTEND:20191121T123000Z
UID:TALK130600@talks.cam.ac.uk
CONTACT:Catherine Pearson
DESCRIPTION:The effect of pressure on chemical and phase equilibrium in cr
 ystalline materials is well understood. For example there is no basic argu
 ment about the circumstances under which pressure turns graphite into diam
 ond. However the Earth and many manufactured crystalline materials around 
 us are under stress. How does that alter the thermodynamics? This topic is
  currently controversial in Earth science. In this talk I outline some of 
 the mathematics behind the question\, and show how one key equation is sub
 stantiated by numerous different sorts of experiment. I then apply that eq
 uation to other scenarios and show that it predicts some odd and significa
 nt effects which are yet to be fully tested (for example big offsets in th
 e conditions for solid state reactions).  I will also describe some intere
 sting mathematical problems that it leads to.
LOCATION:Open Plan Area\, BP Institute\, Madingley Rise CB3 0EZ
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