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Metal-silicate Partitioning at High Pressure and Temperature: Experimental Methods and a Protocol to Suppress Highly Siderophile Element Inclusions
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Constraining composition and temperature variations in the mantle transition zone.

Wen-Yi Zhou1,2, Ming Hao3,4, Jin S Zhang5,6

  • 1Department of Earth and Planetary Sciences, University of New Mexico, Albuquerque, NM, USA. zwy1993@unm.edu.

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Summary

Hydrous wadsleyite properties reveal Earth

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Area of Science:

  • Earth Sciences
  • Mineral Physics
  • Geophysics

Background:

  • The mantle transition zone (MTZ) is a critical region connecting Earth's upper and lower mantle.
  • Wadsleyite is a key mineral within the MTZ, influencing its physical properties.
  • Understanding MTZ composition and dynamics is vital for mantle convection and material exchange.

Purpose of the Study:

  • To determine the elastic properties of hydrous, iron-bearing wadsleyite under high-pressure and high-temperature conditions.
  • To model the global distribution of wadsleyite, temperature, and water content in the MTZ.
  • To investigate thermochemical heterogeneities within the MTZ, particularly near subducted slabs and mantle plumes.

Main Methods:

  • Single-crystal elastic properties of wadsleyite were measured using Brillouin spectroscopy.
  • Mineral physics data were integrated with global seismic observations.
  • Geophysical modeling was employed to map MTZ properties.

Main Results:

  • High-pressure, high-temperature elastic properties of hydrous Fe-bearing wadsleyite were successfully measured.
  • Models indicate colder temperatures, higher wadsleyite proportions, and increased hydration near subducted slabs.
  • Regions associated with mantle plumes show distinct characteristics compared to subduction zones.

Conclusions:

  • Direct evidence for significant thermochemical heterogeneities in the upper mantle transition zone was provided.
  • The findings enhance our understanding of water transport and material cycling between mantle layers.
  • This research contributes to a more comprehensive model of Earth's deep interior dynamics.