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SUMMARY:Chilean Volcanoes constrain global models of convergent margin vol
 canism - Steve Turner\, University of Oxford
DTSTART:20151110T160000Z
DTEND:20151110T170000Z
UID:TALK61204@talks.cam.ac.uk
CONTACT:John Maclennan
DESCRIPTION:The compositional variability of convergent margin stratovolca
 noes can be assessed on multiple scales: within a single edifice\, a singl
 e arc\, or among arc averages. Quantitative models of subduction processes
  are constrained by the relationships between magma chemistry and subducti
 on parameters pertinent to the down-going plate (age\, dip angle\, sedimen
 t thickness and composition)\, the overriding plate (Moho depth)\, or both
  (convergence rate). The subduction parameters are inter-related\, however
 \, so caution must be exercised when positing causal relationships between
  physical and chemical observations.  Arc-averaged magma compositions corr
 elate globally with down-going plate parameters\, Moho depth\, and possibl
 y the p-wave velocities beneath the arc front\, and each of these observat
 ions motivate very different models of compositional variability.  Natural
  regional experiments can be used to test the validity of models developed
  on the basis of global correlations.  The Chilean southern volcanic zone 
 (SVZ) serves as a laboratory to isolate the effects of the overriding vs d
 own-going plate.  I will present a synthesis of new and existing data from
  the SVZ and show how these data constrain global and local models of conv
 ergent margin volcanism\, demonstrating the importance of the upper plate 
 in regulating melt generation.  Numerical simulations provide additional p
 hysical justification for this model.\n\n\n\nTurner\, S. J.\, & Langmuir\,
  C. H. (2015). The global chemical systematics of arc front stratovolcanoe
 s: Evaluating the role of crustal processes. Earth and Planetary Science L
 etters\, 422\, 182-193.\n\nTurner\, S. J.\, & Langmuir\, C. H. (2015). Wha
 t processes control the chemical compositions of arc front stratovolcanoes
 ?. Geochemistry\, Geophysics\, Geosystems.\n
LOCATION:Harker 1 seminar room\, Department of Earth Sciences
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