Recycled oceanic gabbro produced the depleted component in hotspot magma from the Comei large igneous province in the Kerguelen mantle plume
Abstract Depleted components in hotspot magma sources remain enigmatic. Zircon δ18O values (3.97–4.80‰, average 4.38‰) from depleted gabbros in the Comei province (Kerguelen plume) are lower than mantle zircons, correlating negatively with 206Pb/U238ages. Combined with ultradepleted Hf isotopes, thi...
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Nature Portfolio
2025-05-01
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| Series: | Communications Earth & Environment |
| Online Access: | https://doi.org/10.1038/s43247-025-02353-7 |
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| author | Long Chen Yaying Wang Ian Somerville Yuan Zhong Xiaohui Li Dongyong Li Jianghong Deng Shengyao Yu Guochao Sun Zifu Zhao Sanzhong Li |
| author_facet | Long Chen Yaying Wang Ian Somerville Yuan Zhong Xiaohui Li Dongyong Li Jianghong Deng Shengyao Yu Guochao Sun Zifu Zhao Sanzhong Li |
| author_sort | Long Chen |
| collection | DOAJ |
| description | Abstract Depleted components in hotspot magma sources remain enigmatic. Zircon δ18O values (3.97–4.80‰, average 4.38‰) from depleted gabbros in the Comei province (Kerguelen plume) are lower than mantle zircons, correlating negatively with 206Pb/U238ages. Combined with ultradepleted Hf isotopes, this excludes hydrothermal alteration or crustal contamination, instead indicating mixing of heterogeneous mantle magmas with light-oxygen, Hf-depleted components. Elevated Sc/Nb and Y/Nb ratios preclude upper mantle entrainment, while light δ¹⁸O contradicts ancient melting residues. We propose these components originate from recycled high-temperature hydrothermally altered gabbroic oceanic crust, which underwent melt extraction during subduction before incorporation into the plume. Gradual δ¹⁸O increases reflect progressive consumption of these components during melting with ambient mantle. This study highlights recycled gabbroic crust’s role in generating depleted hotspot magmas. Preservation and emergence of low δ¹⁸O and depleted geochemical signatures requires limited mixing with enriched/high-δ¹⁸O materials, as these fragile signatures are easily masked by geochemical overprinting. |
| format | Article |
| id | doaj-art-79f19254e99a41b5a6eda0d2ea25141e |
| institution | Kabale University |
| issn | 2662-4435 |
| language | English |
| publishDate | 2025-05-01 |
| publisher | Nature Portfolio |
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| series | Communications Earth & Environment |
| spelling | doaj-art-79f19254e99a41b5a6eda0d2ea25141e2025-08-20T03:48:06ZengNature PortfolioCommunications Earth & Environment2662-44352025-05-016111210.1038/s43247-025-02353-7Recycled oceanic gabbro produced the depleted component in hotspot magma from the Comei large igneous province in the Kerguelen mantle plumeLong Chen0Yaying Wang1Ian Somerville2Yuan Zhong3Xiaohui Li4Dongyong Li5Jianghong Deng6Shengyao Yu7Guochao Sun8Zifu Zhao9Sanzhong Li10Frontiers Science Center for Deep Ocean Multispheres and Earth System, Key Lab of Submarine GeoSciences and Prospecting Techniques, MOE and College of Marine GeoSciences, Ocean University of ChinaInstitute of Geology, Chinese Academy of Geological SciencesUCD School of Earth Sciences, University College DublinFrontiers Science Center for Deep Ocean Multispheres and Earth System, Key Lab of Submarine GeoSciences and Prospecting Techniques, MOE and College of Marine GeoSciences, Ocean University of ChinaFrontiers Science Center for Deep Ocean Multispheres and Earth System, Key Lab of Submarine GeoSciences and Prospecting Techniques, MOE and College of Marine GeoSciences, Ocean University of ChinaFrontiers Science Center for Deep Ocean Multispheres and Earth System, Key Lab of Submarine GeoSciences and Prospecting Techniques, MOE and College of Marine GeoSciences, Ocean University of ChinaCenter of Deep Sea Research, Institute of Oceanology, Center for Ocean Mega–Science, Chinese Academy of SciencesFrontiers Science Center for Deep Ocean Multispheres and Earth System, Key Lab of Submarine GeoSciences and Prospecting Techniques, MOE and College of Marine GeoSciences, Ocean University of ChinaState Key Laboratory of Lithospheric and Environmental Coevolution, University of Science and Technology of ChinaState Key Laboratory of Lithospheric and Environmental Coevolution, University of Science and Technology of ChinaFrontiers Science Center for Deep Ocean Multispheres and Earth System, Key Lab of Submarine GeoSciences and Prospecting Techniques, MOE and College of Marine GeoSciences, Ocean University of ChinaAbstract Depleted components in hotspot magma sources remain enigmatic. Zircon δ18O values (3.97–4.80‰, average 4.38‰) from depleted gabbros in the Comei province (Kerguelen plume) are lower than mantle zircons, correlating negatively with 206Pb/U238ages. Combined with ultradepleted Hf isotopes, this excludes hydrothermal alteration or crustal contamination, instead indicating mixing of heterogeneous mantle magmas with light-oxygen, Hf-depleted components. Elevated Sc/Nb and Y/Nb ratios preclude upper mantle entrainment, while light δ¹⁸O contradicts ancient melting residues. We propose these components originate from recycled high-temperature hydrothermally altered gabbroic oceanic crust, which underwent melt extraction during subduction before incorporation into the plume. Gradual δ¹⁸O increases reflect progressive consumption of these components during melting with ambient mantle. This study highlights recycled gabbroic crust’s role in generating depleted hotspot magmas. Preservation and emergence of low δ¹⁸O and depleted geochemical signatures requires limited mixing with enriched/high-δ¹⁸O materials, as these fragile signatures are easily masked by geochemical overprinting.https://doi.org/10.1038/s43247-025-02353-7 |
| spellingShingle | Long Chen Yaying Wang Ian Somerville Yuan Zhong Xiaohui Li Dongyong Li Jianghong Deng Shengyao Yu Guochao Sun Zifu Zhao Sanzhong Li Recycled oceanic gabbro produced the depleted component in hotspot magma from the Comei large igneous province in the Kerguelen mantle plume Communications Earth & Environment |
| title | Recycled oceanic gabbro produced the depleted component in hotspot magma from the Comei large igneous province in the Kerguelen mantle plume |
| title_full | Recycled oceanic gabbro produced the depleted component in hotspot magma from the Comei large igneous province in the Kerguelen mantle plume |
| title_fullStr | Recycled oceanic gabbro produced the depleted component in hotspot magma from the Comei large igneous province in the Kerguelen mantle plume |
| title_full_unstemmed | Recycled oceanic gabbro produced the depleted component in hotspot magma from the Comei large igneous province in the Kerguelen mantle plume |
| title_short | Recycled oceanic gabbro produced the depleted component in hotspot magma from the Comei large igneous province in the Kerguelen mantle plume |
| title_sort | recycled oceanic gabbro produced the depleted component in hotspot magma from the comei large igneous province in the kerguelen mantle plume |
| url | https://doi.org/10.1038/s43247-025-02353-7 |
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