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Constraining composition and temperature variations in the mantle transition zone

Author

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  • Wen-Yi Zhou

    (University of New Mexico
    University of New Mexico)

  • Ming Hao

    (University of New Mexico
    University of New Mexico)

  • Jin S. Zhang

    (University of New Mexico
    University of New Mexico)

  • Bin Chen

    (University of Hawaiʻi at Mānoa)

  • Ruijia Wang

    (University of New Mexico)

  • Brandon Schmandt

    (University of New Mexico)

Abstract

The mantle transition zone connects two major layers of Earth’s interior that may be compositionally distinct: the upper mantle and the lower mantle. Wadsleyite is a major mineral in the upper mantle transition zone. Here, we measure the single-crystal elastic properties of hydrous Fe-bearing wadsleyite at high pressure-temperature conditions by Brillouin spectroscopy. Our results are then used to model the global distribution of wadsleyite proportion, temperature, and water content in the upper mantle transition zone by integrating mineral physics data with global seismic observations. Our models show that the upper mantle transition zone near subducted slabs is relatively cold, enriched in wadsleyite, and slightly more hydrated compared to regions where plumes are expected. This study provides direct evidence for the thermochemical heterogeneities in the upper mantle transition zone which is important for understanding the material exchange processes between the upper and lower mantle.

Suggested Citation

  • Wen-Yi Zhou & Ming Hao & Jin S. Zhang & Bin Chen & Ruijia Wang & Brandon Schmandt, 2022. "Constraining composition and temperature variations in the mantle transition zone," Nature Communications, Nature, vol. 13(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-28709-7
    DOI: 10.1038/s41467-022-28709-7
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    References listed on IDEAS

    as
    1. Juliane Dannberg & Stephan V. Sobolev, 2015. "Low-buoyancy thermochemical plumes resolve controversy of classical mantle plume concept," Nature Communications, Nature, vol. 6(1), pages 1-9, November.
    2. Motohiko Murakami & Yasuo Ohishi & Naohisa Hirao & Kei Hirose, 2012. "A perovskitic lower mantle inferred from high-pressure, high-temperature sound velocity data," Nature, Nature, vol. 485(7396), pages 90-94, May.
    3. Teh-Ru Alex Song & Don. V. Helmberger & Stephen P. Grand, 2004. "Low-velocity zone atop the 410-km seismic discontinuity in the northwestern United States," Nature, Nature, vol. 427(6974), pages 530-533, February.
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