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SUMMARY:Unravelling geochemical zoning in subduction zone garnet: ubiquito
 us patterns = ubiquitous process?  - Dr Freya George\, University of Brist
 ol
DTSTART:20230227T180000Z
DTEND:20230227T190000Z
UID:TALK196420@talks.cam.ac.uk
CONTACT:Buck Blake
DESCRIPTION:'The compositional zoning exhibited by many metamorphic minera
 ls serves as a time-resolved record of processes occurring during mineral 
 growth and diffusive relaxation. In garnet derived from a global suite of 
 subduction zones\, oscillatory elemental zoning—rhythmic cycles of peaks
  and troughs in concentration—is commonly observed. This zoning may ther
 efore reflect a fundamental dynamic or petrogenetic process operating duri
 ng garnet crystallization in the subducting slab.\n \n'In this talk I will
  explore the origins of these geochemical patterns. In particular\, I will
  present data that elucidates the potential for fluid buffering during min
 eral growth and discuss the record of mass transfer and equilibration pres
 erved in garnet. Our findings suggest multiple mechanisms of chemical/mass
  transfer operate at the grain and rock scale during subduction\, but are 
 unable to account for the elemental oscillations\, which may instead form 
 in response to externally triggered changes in solubility or fluid pressur
 e.'
LOCATION:Tilley Lecture Theater\, Department of Earth Sciences
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