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Effects of an Endothermic Phase-Transition at 670 km Depth in a Spherical Model of Convection in the Earth’s Mantle

Tackley, Paul J. and Stevenson, David J. and Glatzmaier, Gary A. and Schubert, Gerald (1993) Effects of an Endothermic Phase-Transition at 670 km Depth in a Spherical Model of Convection in the Earth’s Mantle. Nature, 361 (6414). pp. 699-704. ISSN 0028-0836.

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Numerical modelling of mantle convection in a spherical shell with an endothermic phase change at 670 km depth reveals an inherently three-dimensional flow pattern, containing cylindrical plumes and linear sheets which behave differently in their ability to penetrate the phase change. The dynamics are dominated by accumulation of downwelling cold material above 670 km depth, resulting in frequent avalanches of upper-mantle material into the lower mantle. This process generates long-wavelength lateral heterogeneity, helping to resolve the contradiction between seismic tomographic observations and expectations from mantle convection simulations.

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Stevenson, David J.0000-0001-9432-7159
Additional Information:© 1993 Nature Publishing Group. Published 25 February 1993; Received 30 November 1992; accepted 29 January 1993. We thank W.R. Peltier, D.L. Anderson, D.A. Yuen, M. Gurnis, V. Solomatov and the participants of the Los Alamos Mantle Convection Workshop for discussions, U. Christensen for his review and H.X. Qian for photographic assistance. The Intel Touchstone Delta System was operated by the California Institute of Technology on behalf of the Concurrent Supercomputing Consortium. Access to this facility was provided by the Institute. P.T. thanks the NSF for financial support.
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Issue or Number:6414
Record Number:CaltechAUTHORS:20131119-133429121
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:42575
Deposited By: John Wade
Deposited On:19 Nov 2013 23:34
Last Modified:03 Oct 2019 05:59

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