Journal
EARTH AND PLANETARY SCIENCE LETTERS
Volume 361, Issue -, Pages 58-63Publisher
ELSEVIER
DOI: 10.1016/j.epsl.2012.11.026
Keywords
Earth's mantle; silicate melts; high pressure melting; origin of Earth; core-mantle boundary
Categories
Funding
- NERC [NE/F017871/1, NE/I010734/1, hpc010001] Funding Source: UKRI
- Natural Environment Research Council [hpc010001, NE/F017871/1, NE/I010734/1] Funding Source: researchfish
- Division Of Earth Sciences
- Directorate For Geosciences [1118869] Funding Source: National Science Foundation
Ask authors/readers for more resources
Knowledge of the multi-component thermodynamics and phase equilibria of silicate melts in Earth's deep interior are key to understanding the thermal and chemical evolution of the planet, yet the melting phase diagram of the lower mantle remains poorly constrained, with large uncertainties in both eutectic composition and temperature. We use results from first-principles molecular dynamics of nine compositions along the MgO-SiO2 binary to investigate the compositional dependence of liquid state thermodynamics, applying our results to describe incongruent melting for the system at deep lower mantle pressures. Our phase diagram is bi-eutectic throughout the lower mantle, with no liquid immiscibility. Accounting for solid-liquid partitioning of Fe, we find partial melts of basaltic and peridotitic lithologies to be gravitationally stable at the core-mantle boundary, while liquidus density contrasts predict that perovskite will sink and peridase will float in a crystallizing pyrolytic magma ocean. (C) 2012 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available