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Title: Viscosity jump in the lower mantle inferred from melting curves of ferropericlase

Journal Article · · Nature Communications

Convection provides the mechanism behind plate tectonics, which allows oceanic lithosphere to be subducted into the mantle as “slabs” and new rock to be generated by volcanism. Stagnation of subducting slabs and deflection of rising plumes in Earth’s shallow lower mantle have been suggested to result from a viscosity increase at those depths. However, the mechanism for this increase remains elusive. Here, we examine the melting behavior in the MgO–FeO binary system at high pressures using the laser-heated diamond-anvil cell and show that the liquidus and solidus of (Mg x Fe1-x )O ferropericlase (x = ~0.52–0.98), exhibit a local maximum at ~40 GPa, likely caused by the spin transition of iron. We calculate the relative viscosity profiles of ferropericlase using homologous temperature scaling and find that viscosity increases 10–100 times from ~750 km to ~1000–1250 km, with a smaller decrease at deeper depths, pointing to a single mechanism for slab stagnation and plume deflection.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC); National Science Foundation (NSF); NSF Consortium for Materials Properties Research in Earth Sciences
Grant/Contract Number:
SC0012704; EAR-1321956; EAR-1551348; EAR 1606856
OSTI ID:
1624064
Journal Information:
Nature Communications, Vol. 8, Issue 1; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 39 works
Citation information provided by
Web of Science

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Cited By (6)

Fate of Hydrous Fe‐Rich Silicate Melt in Earth's Deep Mantle journal August 2019
Laterally heterogeneous lithosphere, asthenosphere and sub-lithospheric properties under Laurentia and Fennoscandia from Glacial Isostatic Adjustment journal November 2018
Altered chemistry of oxygen and iron under deep Earth conditions journal January 2019
On the Timescale of Magma Ocean Solidification and Its Chemical Consequences: 2. Compositional Differentiation Under Crystal Accumulation and Matrix Compaction journal April 2019
Density-Pressure Profiles of Fe-Bearing MgSiO 3 Liquid: Effects of Valence and Spin States, and Implications for the Chemical Evolution of the Lower Mantle journal May 2018
On the Timescale of Magma Ocean Solidification and Its Chemical Consequences: 1. Thermodynamic Database for Liquid at High Pressures journal April 2019

Figures / Tables (4)


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