Subducted Carbon From Mantle Plume in Mid‐Ocean Ridge Basalts
Abstract Deciphering the Earth's deep carbon cycle, from mantle plumes to mid‐ocean ridges, remains incompletely understood. In this study, we analyze the magnesium isotope composition of basalts collected from the South Mid‐Atlantic Ridge (SMAR), which have been influenced by the off‐axis Sain...
| 出版年: | Geophysical Research Letters |
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| 主要な著者: | , , , , , |
| フォーマット: | 論文 |
| 言語: | 英語 |
| 出版事項: |
Wiley
2025-01-01
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| 主題: | |
| オンライン･アクセス: | https://doi.org/10.1029/2024GL111125 |
| _version_ | 1850005573794267136 |
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| author | Haitao Zhang Quanshu Yan Xuefa Shi Chuanshun Li Fang Huang Qiuyu Wen |
| author_facet | Haitao Zhang Quanshu Yan Xuefa Shi Chuanshun Li Fang Huang Qiuyu Wen |
| author_sort | Haitao Zhang |
| collection | DOAJ |
| container_title | Geophysical Research Letters |
| description | Abstract Deciphering the Earth's deep carbon cycle, from mantle plumes to mid‐ocean ridges, remains incompletely understood. In this study, we analyze the magnesium isotope composition of basalts collected from the South Mid‐Atlantic Ridge (SMAR), which have been influenced by the off‐axis Saint Helena plume originating from the core‐mantle boundary. The magnesium isotope composition of SMAR basalts falls within a similar range (−0.22 to −0.32‰; average −0.25‰ ± 0.03‰) to that of known global oceanic basalts. However, isotope mixing calculations suggest that the lighter magnesium isotope composition in the SMAR basalts is due to the incorporation of approximately 5%–10% recycled carbonate material carried by the Saint Helena plume into the SMAR asthenosphere. This finding not only highlights the interaction between ridges and off‐axis plumes but also proposes a comprehensive model for the Earth's deep carbon cycle, spanning from the subduction zone through the core‐mantle boundary to the mid‐ocean ridge system. |
| format | Article |
| id | doaj-art-0f3ee8a0c36b4b6fa1e39ccc04d36766 |
| institution | Directory of Open Access Journals |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Wiley |
| record_format | Article |
| spelling | doaj-art-0f3ee8a0c36b4b6fa1e39ccc04d367662025-08-20T00:47:06ZengWileyGeophysical Research Letters0094-82761944-80072025-01-01521n/an/a10.1029/2024GL111125Subducted Carbon From Mantle Plume in Mid‐Ocean Ridge BasaltsHaitao Zhang0Quanshu Yan1Xuefa Shi2Chuanshun Li3Fang Huang4Qiuyu Wen5Key Laboratory of Marine Geology and Metallogeny First Institute of Oceanography MNR Qingdao ChinaKey Laboratory of Marine Geology and Metallogeny First Institute of Oceanography MNR Qingdao ChinaKey Laboratory of Marine Geology and Metallogeny First Institute of Oceanography MNR Qingdao ChinaKey Laboratory of Marine Geology and Metallogeny First Institute of Oceanography MNR Qingdao ChinaCAS Key Laboratory of Crust‐Mantle Materials and Environments School of Earth and Space Sciences University of Science and Technology of China Hefei ChinaCAS Key Laboratory of Crust‐Mantle Materials and Environments School of Earth and Space Sciences University of Science and Technology of China Hefei ChinaAbstract Deciphering the Earth's deep carbon cycle, from mantle plumes to mid‐ocean ridges, remains incompletely understood. In this study, we analyze the magnesium isotope composition of basalts collected from the South Mid‐Atlantic Ridge (SMAR), which have been influenced by the off‐axis Saint Helena plume originating from the core‐mantle boundary. The magnesium isotope composition of SMAR basalts falls within a similar range (−0.22 to −0.32‰; average −0.25‰ ± 0.03‰) to that of known global oceanic basalts. However, isotope mixing calculations suggest that the lighter magnesium isotope composition in the SMAR basalts is due to the incorporation of approximately 5%–10% recycled carbonate material carried by the Saint Helena plume into the SMAR asthenosphere. This finding not only highlights the interaction between ridges and off‐axis plumes but also proposes a comprehensive model for the Earth's deep carbon cycle, spanning from the subduction zone through the core‐mantle boundary to the mid‐ocean ridge system.https://doi.org/10.1029/2024GL111125Earth's deep carbon cycleinteraction between mantle plumes and mid‐ocean ridgesmantle convectionmid‐ocean ridge basaltsmagnesium isotopeSouth Mid‐Atlantic Ridge |
| spellingShingle | Haitao Zhang Quanshu Yan Xuefa Shi Chuanshun Li Fang Huang Qiuyu Wen Subducted Carbon From Mantle Plume in Mid‐Ocean Ridge Basalts Earth's deep carbon cycle interaction between mantle plumes and mid‐ocean ridges mantle convection mid‐ocean ridge basalts magnesium isotope South Mid‐Atlantic Ridge |
| title | Subducted Carbon From Mantle Plume in Mid‐Ocean Ridge Basalts |
| title_full | Subducted Carbon From Mantle Plume in Mid‐Ocean Ridge Basalts |
| title_fullStr | Subducted Carbon From Mantle Plume in Mid‐Ocean Ridge Basalts |
| title_full_unstemmed | Subducted Carbon From Mantle Plume in Mid‐Ocean Ridge Basalts |
| title_short | Subducted Carbon From Mantle Plume in Mid‐Ocean Ridge Basalts |
| title_sort | subducted carbon from mantle plume in mid ocean ridge basalts |
| topic | Earth's deep carbon cycle interaction between mantle plumes and mid‐ocean ridges mantle convection mid‐ocean ridge basalts magnesium isotope South Mid‐Atlantic Ridge |
| url | https://doi.org/10.1029/2024GL111125 |
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