Three‐dimensional mantle dynamics with an endothermic phase transition | Zendy

Honda S. | Zendy; Balachandar S. | Zendy; Yuen D. A. | Zendy; Reuteler D. | Zendy

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Three‐dimensional mantle dynamics with an endothermic phase transition

Author(s) -

Honda S.,

Balachandar S.,

Yuen D. A.,

Reuteler D.

Publication year - 1993

Publication title -

geophysical research letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.007

H-Index - 273

eISSN - 1944-8007

pISSN - 0094-8276

DOI - 10.1029/92gl02976

Subject(s) - geology , transition zone , instability , mantle (geology) , geophysics , spinel , convection , rayleigh–taylor instability , phase transition , plume , layering , mantle convection , mechanics , petrology , physics , thermodynamics , subduction , tectonics , seismology , paleontology , botany , biology

Three‐dimensional convection for the spinel to perovskite phase change has been simulated numerically. Results for Rayleigh (Ra) numbers of 0(10 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.

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