Journal
SCIENCE
Volume 328, Issue 5979, Pages 740-742Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1188327
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Funding
- NSF [EAR-0809489]
- UK National Environmental Research Council [NE/F01787/1]
- Division Of Earth Sciences
- Directorate For Geosciences [0809489] Funding Source: National Science Foundation
- Natural Environment Research Council [NE/F017871/1] Funding Source: researchfish
- NERC [NE/F017871/1] Funding Source: UKRI
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Understanding the chemical and thermal evolution of Earth requires knowledge of transport properties of silicate melts at high pressure and high temperature. Here, first-principles molecular dynamics simulations show that the viscosity of MgSiO3 liquid varies by two orders of magnitude over the mantle pressure regime. Addition of water systematically lowers the viscosity, consistent with enhanced structural depolymerization. The combined effects of pressure and temperature along model geotherms lead to a 10-fold increase in viscosity with depth from the surface to the base of the mantle. Based on these calculations, efficient heat flux from a deep magma ocean may have exceeded the incoming solar flux early in Earth's history.
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