Viscosity jump in the lower mantle inferred from melting curves of ferropericlase
Abstract
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 Fe 1-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.
- Publication Date:
- Research Org.:
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC); National Science Foundation (NSF); NSF Consortium for Materials Properties Research in Earth Sciences
- OSTI Identifier:
- 1624064
- Grant/Contract Number:
- SC0012704; EAR-1321956; EAR-1551348; EAR 1606856
- Resource Type:
- Journal Article: Accepted Manuscript
- Journal Name:
- Nature Communications
- Additional Journal Information:
- Journal Volume: 8; Journal Issue: 1; Journal ID: ISSN 2041-1723
- Publisher:
- Nature Publishing Group
- Country of Publication:
- United States
- Language:
- English
- Subject:
- Science & Technology - Other Topics
Citation Formats
Deng, Jie, and Lee, Kanani K. M. Viscosity jump in the lower mantle inferred from melting curves of ferropericlase. United States: N. p., 2017.
Web. doi:10.1038/s41467-017-02263-z.
Deng, Jie, & Lee, Kanani K. M. Viscosity jump in the lower mantle inferred from melting curves of ferropericlase. United States. https://doi.org/10.1038/s41467-017-02263-z
Deng, Jie, and Lee, Kanani K. M. Fri .
"Viscosity jump in the lower mantle inferred from melting curves of ferropericlase". United States. https://doi.org/10.1038/s41467-017-02263-z. https://www.osti.gov/servlets/purl/1624064.
@article{osti_1624064,
title = {Viscosity jump in the lower mantle inferred from melting curves of ferropericlase},
author = {Deng, Jie and Lee, Kanani K. M.},
abstractNote = {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.},
doi = {10.1038/s41467-017-02263-z},
url = {https://www.osti.gov/biblio/1624064},
journal = {Nature Communications},
issn = {2041-1723},
number = 1,
volume = 8,
place = {United States},
year = {2017},
month = {12}
}
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