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oai:www.ideals.illinois.edu:2142/121213 2023-12-11 col_2142_5131 col_2142_16322 com_2142_5130 com_2142_16321 com_2142_13459 com_2142_8903

Bass, Jay D Bass, Jay D Alp, Ercan E Lundstrom, Craig C Liu, Lijun 2023-08 application/pdf en text Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2025-08-01 The student, Paul Ginsberg, accepted the attached license on 2023-07-04 at 19:03. The student, Paul Ginsberg, submitted this Dissertation for approval on 2023-07-04 at 19:21. This Dissertation was approved for publication on 2023-07-05 at 16:23. DSpace SAF Submission Ingestion Package generated from Vireo submission #19494 on 2023-12-04 at 17:30:37 Augite Mineral Physics Sound Velocities Elastic properties of mantle minerals by multiple methods and at high pressures and temperatures Ginsberg, Paul 2023-07-05 Brillouin Scattering Diamond Anvil Cell Laser Heating Garnet Bridgmanite Discerning how the sound velocities of minerals vary with pressure, temperature, and composition is critical to understanding the physical state and mineral makeup of the Earth’s mantle. Despite the impact of mantle composition on a wide range of problems in the geosciences, large uncertainties remain, both for the upper and lower mantle. This is primarily due to the challenges of both extrapolating laboratory measurements at ambient conditions to the pressure and temperature conditions of the deep earth and of making such measurements directly under those conditions. My research aim has been to extend measurements of sound speed in minerals to the high P,T conditions of the deep Earth. Firstly, I explore compositional elasticity trends among clinopyroxenes by measuring the sound velocities of an Fe-rich augite at room conditions. Secondly, I measure the elastic properties of natural garnets, both as a function of composition and of pressure, using two complementary techniques. I then present measurements made under simultaneous mantle P,T conditions for a near-endmember garnet composition. Finally, I transform this sample to the primary lower mantle mineral, bridgmanite, and determine its high- pressure elastic properties in order to better understand the effect of Al-incorporation. Text eng https://hdl.handle.net/2142/121213 Copyright 2023 Paul A Ginsberg Ph.D. Dissertation Geology University of Illinois at Urbana-Champaign Earth Sci & Environmental Chng