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. https://resolver.caltech.edu/CaltechAUTHORS:20130710-103518984
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Abstract
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.
| Item Type: | Article | |||||||||
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| 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 | |||||||||
| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20130710-103518984 | |||||||||
| 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 | |||||||||
| Collection: | CaltechAUTHORS | |||||||||
| Deposited By: | Tony Diaz | |||||||||
| Deposited On: | 10 Jul 2013 18:31 | |||||||||
| Last Modified: | 03 Oct 2019 05:05 |
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