000005451 001__ 5451
000005451 005__ 20211006185411.0
000005451 0247_ $$2DOI$$a10.1029/2021GL093977
000005451 037__ $$aSCART-2021-0126
000005451 100__ $$aXu, F. 
000005451 245__ $$aLow Velocity Zones in the Martian Upper Mantle Highlighted by Sound Velocity Measurements
000005451 260__ $$c2021
000005451 520__ $$a The InSight mission to Mars is currently monitoring the seismic activity of the planet. Interpretation of seismological observations in terms of composition and mineralogy requires the knowledge of density and thermo-elastic properties of constituent materials at pertinent conditions. We thus performed phase equilibria experiments and carried out sound velocity and density measurements on aggregates representative of the Martian mantle over pressures and temperatures directly relevant for Mars? upper and mid mantle. Our results indicate the stability of magnetite, although in a small amount, in phase assemblages at upper mantle conditions, especially in an oxidized environment. The measured pressure and temperature derivatives of compressional and shear velocities show that the temperature-induced reduction of seismic wave speeds dominates over pressure-induced effects at Mars' shallow mantle conditions for the predicted areotherms and, independently from mineralogy, support the presence of a low-shear-wave-velocity layer between 150 and 350 km depth, in agreement with seismic observations.
000005451 594__ $$aNO
000005451 700__ $$aSiersch, N. C. 
000005451 700__ $$aGréaux, S. 
000005451 700__ $$aRivoldini, A. 
000005451 700__ $$aKuwahara, H. 
000005451 700__ $$aKondo, N. 
000005451 700__ $$aWehr, N. 
000005451 700__ $$aMenguy, N. 
000005451 700__ $$aKono, Y. 
000005451 700__ $$aHigo, Y. 
000005451 700__ $$aPlesa, A. -C. 
000005451 700__ $$aBadro, J. 
000005451 700__ $$aAntonangeli, D.
000005451 773__ $$n19$$pGeophysical Research Letters$$v48$$y2021
000005451 8560_ $$fattilio.rivoldini@observatoire.be
000005451 8564_ $$s771644$$uhttps://publi2-as.oma.be/record/5451/files/Xu2021vx75.pdf
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000005451 8564_ $$s21546$$uhttps://publi2-as.oma.be/record/5451/files/Xu2021vx75.jpg?subformat=icon-180$$xicon-180
000005451 905__ $$apublished in
000005451 980__ $$aREFERD