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Title: 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.

Authors:
ORCiD logo [1]; ORCiD logo [1]
  1. Department of Geology and Geophysics, Yale University, New Haven, CT, 06511, USA
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. doi: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. doi: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},
journal = {Nature Communications},
issn = {2041-1723},
number = 1,
volume = 8,
place = {United States},
year = {2017},
month = {12}
}

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Cited by: 15 works
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