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AGU journal highlights -- March 12, 2009
Date:3/12/2009

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Perovskite is the major mineral phase in the lower mantleit dominates the seismic properties and viscous deformation of the deep Earth. At high pressures and temperatures, perovskite transforms into an altered crystal-packing form called postperovskite. The region where the transformation occurs, known as the D'' layer, is directly above the core-mantle boundary and is distinguished by large seismic velocity jumps. Using forms of a synthetic, solid compound containing calcium, iridium and oxygen as analogs for perovskite and postperovskite, Walte et al. conduct laboratory experiments to simulate the perovskite transitions under high temperatures and pressures. Expanding on past research that demonstrated that crystal lattice orientations in the analog postperovskite alter when deformed, the authors find that the transformation of the analog perovskite to analog postperovskite itself yields a crystal lattice structure different from postperovskite deformation textures. If the analogue between the compound used in the experiments and the perovskite crystal-packing system holds true, such lattice orientation transitions may explain the observed seismic jumps. On a more local level, the fast spikes in certain seismic velocities may be explained by downwelling material that underwent these observed crystal lattice transformations.

Title: Transformation textures in post-perovskite: Understanding mantle flow in the D'' layer of the Earth

Authors:

N. P. Walte, F. Heidelbach, N. Miyajima, D. J. Frost, and D. C. Rubie: Bayerisches Geoinstitut, Universitt Bayreuth, Bayreuth, Germany;

D. P. Dobson: Department of Earth Sciences, University College London, London, U.K.

Source: Geophysical Research Letters (GRL) paper 10.1029/2008GL036840, 2009; http://dx.doi.org/10.1029/2008GL036840

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Contact: Maria-Jose Vinas
mjvinas@agu.org
202-777-7530
American Geophysical Union
Source:Eurekalert

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