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CATEGORIES:Bullard Laboratories Wednesday Seminars
SUMMARY:Experimental Exploration of Earth’s Mantle - Hauke
  Marquardt - University of Oxford
DTSTART;TZID=Europe/London:20191120T160000
DTEND;TZID=Europe/London:20191120T170000
UID:TALK131302AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/131302
DESCRIPTION:Processes in Earth's mantle govern our planet's in
 ner dynamics and control surface plate tectonics. 
 As such\, a quantitative understanding of the phys
 ical properties of the mantle is pivotal to model 
 Earth’s dynamic evolution\, including the long-ter
 m chemical interactions between mantle and atmosph
 ere that are vital to the development of habitabil
 ity on Earth. Here\, I will discuss recent results
  of experimental measurements to constrain physica
 l properties of Earth mantle minerals at condition
 s relevant to Earth’s deep mantle. The experiments
  are performed by optical spectroscopy and synchro
 tron x-ray diffraction in (heated) diamond-anvil c
 ells. I will focus on (i) the seismic signature of
  “water” in Earth’s transition zone constrained by
  multi-sample loading Brillouin spectroscopy exper
 iments\, and (ii) the effect of the iron spin tran
 sition in Earth’s lower mantle on the compression 
 behaviour of ferropericlase measured by time-resol
 ved x-ray diffraction in dynamic diamond-anvil cel
 ls.\n\nReferences:\n1) Marquardt\, Hauke\, et al. 
 "Elastic softening of (Mg0. 8Fe0. 2) O ferropericl
 ase across the iron spin crossover measured at sei
 smic frequencies." Geophysical Research Letters 45
 .14 (2018): 6862-6868.\n2) Schulze\, Kirsten\, et 
 al. "Seismically invisible water in Earth's transi
 tion zone?." Earth and Planetary Science Letters 4
 98 (2018): 9-16.\n3) Buchen\, Johannes\, et al. "H
 igh-pressure single-crystal elasticity of wadsleyi
 te and the seismic signature of water in the shall
 ow transition zone." Earth and Planetary Science L
 etters 498 (2018): 77-87\n4)Marquardt\, Hauke\, et
  al. "Single-crystal elasticity of (Mg0. 9Fe0. 1) 
 O to 81 GPa." Earth and Planetary Science Letters 
 287.3-4 (2009): 345-352.\n
LOCATION:Marine/Wolfson Building lecture hall\, Bullard Lab
 s.
CONTACT:Alistair Boyce
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