Widespread PREMA in the upper mantle indicated by low-degree basaltic melts
Abstract Studies of ocean island basalts have identified a Prevalent Mantle (PREMA) component as a fundamental feature of mantle geochemical arrays; however, its origin and distribution are highly controversial, including its potential link to plumes sourced in low-shear-wave velocity provinces (LLS...
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Nature Portfolio
2023-12-01
|
| Series: | Nature Communications |
| Online Access: | https://doi.org/10.1038/s41467-023-43845-4 |
| _version_ | 1797397914898661376 |
|---|---|
| author | Ronghua Cai Jingao Liu D. Graham Pearson Andrea Giuliani Peter E. van Keken Senan Oesch |
| author_facet | Ronghua Cai Jingao Liu D. Graham Pearson Andrea Giuliani Peter E. van Keken Senan Oesch |
| author_sort | Ronghua Cai |
| collection | DOAJ |
| description | Abstract Studies of ocean island basalts have identified a Prevalent Mantle (PREMA) component as a fundamental feature of mantle geochemical arrays; however, its origin and distribution are highly controversial, including its potential link to plumes sourced in low-shear-wave velocity provinces (LLSVPs) above the core-mantle boundary. In this study, we interrogate the compositional systematics of ~ 3500 Cenozoic oceanic and continental sodic basalts to provide insights into the origin and distribution of PREMA. We find that low-degree basaltic melts with high Nb concentrations located away from deep-mantle plumes have PREMA-like Sr-Nd-Hf isotopic signatures, implying that PREMA is highly fusible and not exclusively associated with LLSVPs. Geochemical modelling and mantle convection simulations indicate that PREMA could have been generated soon after Earth accretion, experiencing only minimal melting or enrichment, and then scattered throughout the upper mantle, rather than being the result of mixing between depleted and enriched mantle components. |
| first_indexed | 2024-03-09T01:17:07Z |
| format | Article |
| id | doaj.art-ebb8c2bae22d43a39121d316df89496f |
| institution | Directory Open Access Journal |
| issn | 2041-1723 |
| language | English |
| last_indexed | 2024-03-09T01:17:07Z |
| publishDate | 2023-12-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Nature Communications |
| spelling | doaj.art-ebb8c2bae22d43a39121d316df89496f2023-12-10T12:24:52ZengNature PortfolioNature Communications2041-17232023-12-0114111010.1038/s41467-023-43845-4Widespread PREMA in the upper mantle indicated by low-degree basaltic meltsRonghua Cai0Jingao Liu1D. Graham Pearson2Andrea Giuliani3Peter E. van Keken4Senan Oesch5State Key Laboratory of Geological Processes and Mineral Resources, China University of GeosciencesState Key Laboratory of Geological Processes and Mineral Resources, China University of GeosciencesDepartment of Earth and Atmospheric Sciences, University of AlbertaInstitute of Geochemistry and Petrology, Department of Earth Sciences, ETH ZurichEarth and Planets Laboratory, Carnegie Institution for ScienceInstitute of Geochemistry and Petrology, Department of Earth Sciences, ETH ZurichAbstract Studies of ocean island basalts have identified a Prevalent Mantle (PREMA) component as a fundamental feature of mantle geochemical arrays; however, its origin and distribution are highly controversial, including its potential link to plumes sourced in low-shear-wave velocity provinces (LLSVPs) above the core-mantle boundary. In this study, we interrogate the compositional systematics of ~ 3500 Cenozoic oceanic and continental sodic basalts to provide insights into the origin and distribution of PREMA. We find that low-degree basaltic melts with high Nb concentrations located away from deep-mantle plumes have PREMA-like Sr-Nd-Hf isotopic signatures, implying that PREMA is highly fusible and not exclusively associated with LLSVPs. Geochemical modelling and mantle convection simulations indicate that PREMA could have been generated soon after Earth accretion, experiencing only minimal melting or enrichment, and then scattered throughout the upper mantle, rather than being the result of mixing between depleted and enriched mantle components.https://doi.org/10.1038/s41467-023-43845-4 |
| spellingShingle | Ronghua Cai Jingao Liu D. Graham Pearson Andrea Giuliani Peter E. van Keken Senan Oesch Widespread PREMA in the upper mantle indicated by low-degree basaltic melts Nature Communications |
| title | Widespread PREMA in the upper mantle indicated by low-degree basaltic melts |
| title_full | Widespread PREMA in the upper mantle indicated by low-degree basaltic melts |
| title_fullStr | Widespread PREMA in the upper mantle indicated by low-degree basaltic melts |
| title_full_unstemmed | Widespread PREMA in the upper mantle indicated by low-degree basaltic melts |
| title_short | Widespread PREMA in the upper mantle indicated by low-degree basaltic melts |
| title_sort | widespread prema in the upper mantle indicated by low degree basaltic melts |
| url | https://doi.org/10.1038/s41467-023-43845-4 |
| work_keys_str_mv | AT ronghuacai widespreadpremaintheuppermantleindicatedbylowdegreebasalticmelts AT jingaoliu widespreadpremaintheuppermantleindicatedbylowdegreebasalticmelts AT dgrahampearson widespreadpremaintheuppermantleindicatedbylowdegreebasalticmelts AT andreagiuliani widespreadpremaintheuppermantleindicatedbylowdegreebasalticmelts AT peterevankeken widespreadpremaintheuppermantleindicatedbylowdegreebasalticmelts AT senanoesch widespreadpremaintheuppermantleindicatedbylowdegreebasalticmelts |