University of Illinois Urbana-Champaign

Elastic properties of mantle minerals by multiple methods and at high pressures and temperatures

Ginsberg, Paul

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https://hdl.handle.net/2142/121213

Description

Title
Elastic properties of mantle minerals by multiple methods and at high pressures and temperatures
Author(s)
Ginsberg, Paul
Issue Date
2023-07-05
Director of Research (if dissertation) or Advisor (if thesis)
Bass, Jay D
Doctoral Committee Chair(s)
Bass, Jay D
Committee Member(s)
  • Alp, Ercan E
  • Lundstrom, Craig C
  • Liu, Lijun
Department of Study
Earth Sci & Environmental Chng
Discipline
Geology
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
  • Brillouin Scattering
  • Diamond Anvil Cell
  • Laser Heating
  • Garnet
  • Bridgmanite
  • Augite
  • Mineral Physics
  • Sound Velocities
Abstract
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.
Graduation Semester
2023-08
Type of Resource
Thesis
Copyright and License Information
Copyright 2023 Paul A Ginsberg

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