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      Constraining composition and temperature variations in the mantle transition zone

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          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.

          Abstract

          A new study by @JinZhang_MP models the global distribution of wadsleyite proportion, temperature and water content in the upper mantle transition zone.

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              S40RTS: a degree-40 shear-velocity model for the mantle from new Rayleigh wave dispersion, teleseismic traveltime and normal-mode splitting function measurements

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                Author and article information

                Contributors
                zwy1993@unm.edu
                jinzhang@unm.edu
                Journal
                Nat Commun
                Nat Commun
                Nature Communications
                Nature Publishing Group UK (London )
                2041-1723
                1 March 2022
                1 March 2022
                2022
                : 13
                : 1094
                Affiliations
                [1 ]GRID grid.266832.b, ISNI 0000 0001 2188 8502, Department of Earth and Planetary Sciences, , University of New Mexico, ; Albuquerque, NM USA
                [2 ]GRID grid.266832.b, ISNI 0000 0001 2188 8502, Institute of Meteoritics, , University of New Mexico, ; Albuquerque, NM USA
                [3 ]GRID grid.410445.0, ISNI 0000 0001 2188 0957, Hawaii Institute of Geophysics and Planetology, , University of Hawaiʻi at Mānoa, ; Honolulu, HI USA
                Author information
                http://orcid.org/0000-0002-5712-1992
                http://orcid.org/0000-0003-1380-3569
                http://orcid.org/0000-0002-1936-7780
                http://orcid.org/0000-0001-8314-9991
                http://orcid.org/0000-0002-1757-5113
                Article
                28709
                10.1038/s41467-022-28709-7
                8888558
                35232983
                1054f959-7fba-4374-b446-7760a46eb7e1
                © The Author(s) 2022

                Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

                History
                : 6 July 2021
                : 24 January 2022
                Funding
                Funded by: FundRef https://doi.org/10.13039/100000001, National Science Foundation (NSF);
                Award ID: NSF-EAR-1664471
                Award ID: NSF-EAR-1555388
                Award ID: NSF-EAR-1829273
                Award ID: NSF-EAR-1664471
                Award Recipient :
                Categories
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                © The Author(s) 2022

                Uncategorized
                geodynamics,geophysics,mineralogy
                Uncategorized
                geodynamics, geophysics, mineralogy

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