Formation of Structurally Bound Carbonate in Silicate Melts on the Top of the Mantle Transition Zone
Abstract Carbon‐bearing dense silicate melts may account for the seismically weak layers on top of the mantle transition zone (MTZ) at 13–14 GPa. How carbon is incorporated into silicate melts at such high pressures has not been experimentally probed, making the nature of carbon in dense melts elusi...
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Wiley
2025-02-01
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| Series: | Geophysical Research Letters |
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| Online Access: | https://doi.org/10.1029/2024GL113755 |
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| author | Eun Jeong Kim Sung Keun Lee |
| author_facet | Eun Jeong Kim Sung Keun Lee |
| author_sort | Eun Jeong Kim |
| collection | DOAJ |
| description | Abstract Carbon‐bearing dense silicate melts may account for the seismically weak layers on top of the mantle transition zone (MTZ) at 13–14 GPa. How carbon is incorporated into silicate melts at such high pressures has not been experimentally probed, making the nature of carbon in dense melts elusive. Here, our nuclear magnetic resonance experiments reveal how carbon and pressure influence the structure of mantle melts. The pressure‐driven changes in the Si coordination environments and network connectivity in dense melts are accompanied by a dramatic increase in the fraction of structurally bound carbonates above 8 GPa up to 14 GPa, further polymerizing melt networks. The pressure‐driven melt polymerization and increase in diversity in carbon configurations reveal the mechanisms behind the pressure‐induced propensity to store carbon in silicate melts under compression. The substantial carbon incorporation in silicate melts toward the MTZ may potentially filter out the carbon from subducting slabs, controlling the deep carbon cycle. |
| format | Article |
| id | doaj-art-6743e9104f604478b36115194ae03f24 |
| institution | DOAJ |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2025-02-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-6743e9104f604478b36115194ae03f242025-08-20T02:52:30ZengWileyGeophysical Research Letters0094-82761944-80072025-02-01523n/an/a10.1029/2024GL113755Formation of Structurally Bound Carbonate in Silicate Melts on the Top of the Mantle Transition ZoneEun Jeong Kim0Sung Keun Lee1School of Earth and Environmental Sciences Seoul National University Seoul KoreaSchool of Earth and Environmental Sciences Seoul National University Seoul KoreaAbstract Carbon‐bearing dense silicate melts may account for the seismically weak layers on top of the mantle transition zone (MTZ) at 13–14 GPa. How carbon is incorporated into silicate melts at such high pressures has not been experimentally probed, making the nature of carbon in dense melts elusive. Here, our nuclear magnetic resonance experiments reveal how carbon and pressure influence the structure of mantle melts. The pressure‐driven changes in the Si coordination environments and network connectivity in dense melts are accompanied by a dramatic increase in the fraction of structurally bound carbonates above 8 GPa up to 14 GPa, further polymerizing melt networks. The pressure‐driven melt polymerization and increase in diversity in carbon configurations reveal the mechanisms behind the pressure‐induced propensity to store carbon in silicate melts under compression. The substantial carbon incorporation in silicate melts toward the MTZ may potentially filter out the carbon from subducting slabs, controlling the deep carbon cycle.https://doi.org/10.1029/2024GL113755deep carbon cyclelow‐velocity layermantle transition zonesolid‐state NMRsilicate melts under compression |
| spellingShingle | Eun Jeong Kim Sung Keun Lee Formation of Structurally Bound Carbonate in Silicate Melts on the Top of the Mantle Transition Zone Geophysical Research Letters deep carbon cycle low‐velocity layer mantle transition zone solid‐state NMR silicate melts under compression |
| title | Formation of Structurally Bound Carbonate in Silicate Melts on the Top of the Mantle Transition Zone |
| title_full | Formation of Structurally Bound Carbonate in Silicate Melts on the Top of the Mantle Transition Zone |
| title_fullStr | Formation of Structurally Bound Carbonate in Silicate Melts on the Top of the Mantle Transition Zone |
| title_full_unstemmed | Formation of Structurally Bound Carbonate in Silicate Melts on the Top of the Mantle Transition Zone |
| title_short | Formation of Structurally Bound Carbonate in Silicate Melts on the Top of the Mantle Transition Zone |
| title_sort | formation of structurally bound carbonate in silicate melts on the top of the mantle transition zone |
| topic | deep carbon cycle low‐velocity layer mantle transition zone solid‐state NMR silicate melts under compression |
| url | https://doi.org/10.1029/2024GL113755 |
| work_keys_str_mv | AT eunjeongkim formationofstructurallyboundcarbonateinsilicatemeltsonthetopofthemantletransitionzone AT sungkeunlee formationofstructurallyboundcarbonateinsilicatemeltsonthetopofthemantletransitionzone |