{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/86553"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/86553","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Elasticity of Mantle Minerals: Composition, Pressure and Temperature Dependence","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.","abstract_html":"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. 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