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SUMMARY:Experimental Exploration of Earth’s Mantle - Hauke Marquardt - U
 niversity of Oxford
DTSTART:20191120T160000Z
DTEND:20191120T170000Z
UID:TALK131302@talks.cam.ac.uk
CONTACT:Alistair Boyce
DESCRIPTION:Processes in Earth's mantle govern our planet's inner dynamics
  and control surface plate tectonics. As such\, a quantitative understandi
 ng of the physical properties of the mantle is pivotal to model Earth’s 
 dynamic evolution\, including the long-term chemical interactions between 
 mantle and atmosphere that are vital to the development of habitability on
  Earth. Here\, I will discuss recent results of experimental measurements 
 to constrain physical properties of Earth mantle minerals at conditions re
 levant to Earth’s deep mantle. The experiments are performed by optical 
 spectroscopy and synchrotron 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 spectrosco
 py experiments\, and (ii) the effect of the iron spin transition in Earth
 ’s lower mantle on the compression behaviour of ferropericlase measured 
 by time-resolved x-ray diffraction in dynamic diamond-anvil cells.\n\nRefe
 rences:\n1) Marquardt\, Hauke\, et al. "Elastic softening of (Mg0. 8Fe0. 2
 ) O ferropericlase across the iron spin crossover measured at seismic freq
 uencies." Geophysical Research Letters 45.14 (2018): 6862-6868.\n2) Schulz
 e\, Kirsten\, et al. "Seismically invisible water in Earth's transition zo
 ne?." Earth and Planetary Science Letters 498 (2018): 9-16.\n3) Buchen\, J
 ohannes\, et al. "High-pressure single-crystal elasticity of wadsleyite an
 d the seismic signature of water in the shallow transition zone." Earth an
 d Planetary Science Letters 498 (2018): 77-87\n4)Marquardt\, Hauke\, et al
 . "Single-crystal elasticity of (Mg0. 9Fe0. 1) O to 81 GPa." Earth and Pla
 netary Science Letters 287.3-4 (2009): 345-352.\n
LOCATION:Marine/Wolfson Building lecture hall\, Bullard Labs.
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