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Uncertainty of mantle geophysical properties computed from phase equilibrium models

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Author Connolly James A. D., Khan Amir,
Project Boiling of silicate liquids, II: a molecular dynamic and thermodynamic analysis
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Original article (peer-reviewed)

Journal GEOPHYSICAL RESEARCH LETTERS
Volume (Issue) 43(10)
Page(s) 5026 - 5034
Title of proceedings GEOPHYSICAL RESEARCH LETTERS
DOI 10.1002/2016gl068239

Abstract

Phase equilibrium models are used routinely to predict geophysically relevant mantle properties. A limitation of this approach is that nonlinearity of the phase equilibrium problem precludes direct assessment of the resultant uncertainties. To overcome this obstacle, we stochastically assess uncertainties along self-consistent mantle adiabats for pyrolitic and basaltic bulk compositions to 2000 km depth. The dominant components of the uncertainty are the identity, composition and elastic properties of the minerals. For P wave speed and density, the latter components vary little, whereas the first is confined to the upper mantle. Consequently, P wave speeds, densities, and adiabatic temperatures and pressures predicted by phase equilibrium models are more uncertain in the upper mantle than in the lower mantle. In contrast, uncertainties in S wave speeds are dominated by the uncertainty in shear moduli and are approximately constant throughout the model depth range.
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