Elasticity of Mantle Minerals: Composition, Pressure and Temperature Dependence
Sinogeikin, Stanislav Valentinovich
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https://hdl.handle.net/2142/86553
Description
Title
Elasticity of Mantle Minerals: Composition, Pressure and Temperature Dependence
Author(s)
Sinogeikin, Stanislav Valentinovich
Issue Date
1999
Doctoral Committee Chair(s)
Bass, Jay D.
Department of Study
Geology
Discipline
Geology
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Mineralogy
Language
eng
Abstract
An extrapolation of our data to transition zone pressure and temperature indicates that the shear and compressional impedance contrasts associated with beta- →gamma-(Mg,Fe)2SiO4 transition are sufficient to produce a resolvable discontinuity at 520 km even with a moderate (30--50%) amount of olivine. A single olivine content can explain both the 400 and 520 km discontinuities. High velocity gradients in the transition zone is explained by pyroxene → majorite transition rather than adiabatic compression of minerals.
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