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Three-dimensional mantle dynamics with an endothermic phase transition3D convection for the spinel to perovskite phase change has been simulated numerically. Results for Rayleigh (Ra) numbers of 0(10 exp 6) show intermittent layering with a strong robust plume rising through the phase boundary. Many descending instabilities are deflected but merging cold sheets come together at a junction. A pool of cold material accumulates underneath in the phase-transition zone. A strong gravitational instability results, which precipitates a rapid and massive discharge of upper-mantle material.
Document ID
19930042317
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Honda, S.
(Hiroshima Univ. Higashihiroshima, Japan)
Balachandar, S.
(Illinois Univ. Urbana, United States)
Yuen, D. A.
(NASA Headquarters Washington, DC United States)
Reuteler, D.
(Minnesota Univ. Minneapolis, United States)
Date Acquired
August 16, 2013
Publication Date
February 5, 1993
Publication Information
Publication: Geophysical Research Letters
Volume: 20
Issue: 3
ISSN: 0094-8276
Subject Category
Geophysics
Accession Number
93A26314
Distribution Limits
Public
Copyright
Other

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