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Suction mechanism for iron entrainment into the lower mantle

Kanda, Ravi V. S. and Stevenson, David J. (2006) Suction mechanism for iron entrainment into the lower mantle. Geophysical Research Letters, 33 (2). Art. No. L02310. ISSN 0094-8276.

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Perturbations in the Earth's rotation rate at decadal time periods strongly favor the existence of dissipative coupling at the Core–Mantle Boundary (CMB). Here, we explored the plausibility of maintaining a conducting layer on the mantle-side of the CMB, which can couple the outer core and mantle through Lorentz torques. We propose a suction mechanism that maintains a porous medium on the mantle side of the CMB, with the interconnected pore-space partly or entirely filled with liquid iron up to a thickness of ∼1 km. The suction arises from the deviatoric stresses supported by the mantle-solid in regions of mantle downwelling. Infiltration of liquid iron occurs by percolation, but is inhibited by the rate of viscous dilation of the solid mantle. Our model enables core-mantle material exchange, and maintains a thin conducting layer that has seismic detection potential. Our model is only marginally satisfactory in explaining the inferred CMB coupling.

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Stevenson, David J.0000-0001-9432-7159
Additional Information:© 2006 by the American Geophysical Union. Received 19 October 2005; revised 7 December 2005; accepted 13 December 2005; published 25 January 2006. We would like to thank Bruce Buffett and an anonymous reviewer for constructive comments.
Issue or Number:2
Record Number:CaltechAUTHORS:20130710-103518984
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Official Citation:Kanda, R. V. S., and D. J. Stevenson (2006), Suction mechanism for iron entrainment into the lower mantle, Geophys. Res. Lett., 33, L02310, doi:10.1029/2005GL025009
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:39282
Deposited By: Tony Diaz
Deposited On:10 Jul 2013 18:31
Last Modified:03 Oct 2019 05:05

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