New High‐Pressure Phase of CaCO3 at the Topmost Lower Mantle: Implication for the Deep‐Mantle Carbon Transportation
Abstract In this study, we have investigated the stability of CaCO3 at high pressures and temperatures using synchrotron X‐ray diffraction in laser‐heated diamond anvil cells. Our experimental results have shown that CaCO3 in the aragonite structure transforms into CaCO3‐VII (P21/c) at 27 GPa and 1,...
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| Format: | Article |
| Language: | English |
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Wiley
2018-02-01
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| Series: | Geophysical Research Letters |
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| Online Access: | https://doi.org/10.1002/2017GL076536 |
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| author | Xinyang Li Zhigang Zhang Jung‐Fu Lin Huaiwei Ni Vitali B. Prakapenka Zhu Mao |
| author_facet | Xinyang Li Zhigang Zhang Jung‐Fu Lin Huaiwei Ni Vitali B. Prakapenka Zhu Mao |
| author_sort | Xinyang Li |
| collection | DOAJ |
| description | Abstract In this study, we have investigated the stability of CaCO3 at high pressures and temperatures using synchrotron X‐ray diffraction in laser‐heated diamond anvil cells. Our experimental results have shown that CaCO3 in the aragonite structure transforms into CaCO3‐VII (P21/c) at 27 GPa and 1,500 K with a negative Clapeyron slope of −4.3(9) MPa/K. CaCO3‐VII is stable between 23 and 38 GPa at 2,300 K and transforms into post‐aragonite at 42 GPa and 1,400 K. Furthermore, it reacts with stishovite, an abundant form of SiO2 in subducted oceanic crust, forming CaSiO3‐perovskite. The occurrence of CaSiO3‐perovskite via the reaction of CaCO3‐VII and stishovite provides an explanation for the observation of the high concentrations of CaSiO3‐perovskite and some amount of CaCO3 in deep‐mantle inclusions. CaCO3‐VII is thus an important carbon‐bearing phase at the topmost lower mantle and may provide necessary carbon to produce deep‐mantle diamonds. |
| format | Article |
| id | doaj-art-64078436953b4f1c82f5fc9514ec035e |
| institution | OA Journals |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2018-02-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-64078436953b4f1c82f5fc9514ec035e2025-08-20T01:51:44ZengWileyGeophysical Research Letters0094-82761944-80072018-02-014531355136010.1002/2017GL076536New High‐Pressure Phase of CaCO3 at the Topmost Lower Mantle: Implication for the Deep‐Mantle Carbon TransportationXinyang Li0Zhigang Zhang1Jung‐Fu Lin2Huaiwei Ni3Vitali B. Prakapenka4Zhu Mao5Laboratory of Seismology and Physics of Earth's Interior, School of Earth and Planetary Sciences University of Science and Technology of China Hefei ChinaKey Laboratory of Earth and Planetary Physics Institute of Geology and Geophysics, Chinese Academy of Sciences Beijing ChinaDepartment of Geological Sciences, Jackson School of Geosciences The University of Texas at Austin Austin TX USALaboratory of Seismology and Physics of Earth's Interior, School of Earth and Planetary Sciences University of Science and Technology of China Hefei ChinaCenter for Advanced Radiation Sources University of Chicago Chicago IL USALaboratory of Seismology and Physics of Earth's Interior, School of Earth and Planetary Sciences University of Science and Technology of China Hefei ChinaAbstract In this study, we have investigated the stability of CaCO3 at high pressures and temperatures using synchrotron X‐ray diffraction in laser‐heated diamond anvil cells. Our experimental results have shown that CaCO3 in the aragonite structure transforms into CaCO3‐VII (P21/c) at 27 GPa and 1,500 K with a negative Clapeyron slope of −4.3(9) MPa/K. CaCO3‐VII is stable between 23 and 38 GPa at 2,300 K and transforms into post‐aragonite at 42 GPa and 1,400 K. Furthermore, it reacts with stishovite, an abundant form of SiO2 in subducted oceanic crust, forming CaSiO3‐perovskite. The occurrence of CaSiO3‐perovskite via the reaction of CaCO3‐VII and stishovite provides an explanation for the observation of the high concentrations of CaSiO3‐perovskite and some amount of CaCO3 in deep‐mantle inclusions. CaCO3‐VII is thus an important carbon‐bearing phase at the topmost lower mantle and may provide necessary carbon to produce deep‐mantle diamonds.https://doi.org/10.1002/2017GL076536CaCO3‐VIICaCO3‐SiO2 reactiontopmost lower mantlehigh pressure‐temperaturecarbon transportation |
| spellingShingle | Xinyang Li Zhigang Zhang Jung‐Fu Lin Huaiwei Ni Vitali B. Prakapenka Zhu Mao New High‐Pressure Phase of CaCO3 at the Topmost Lower Mantle: Implication for the Deep‐Mantle Carbon Transportation Geophysical Research Letters CaCO3‐VII CaCO3‐SiO2 reaction topmost lower mantle high pressure‐temperature carbon transportation |
| title | New High‐Pressure Phase of CaCO3 at the Topmost Lower Mantle: Implication for the Deep‐Mantle Carbon Transportation |
| title_full | New High‐Pressure Phase of CaCO3 at the Topmost Lower Mantle: Implication for the Deep‐Mantle Carbon Transportation |
| title_fullStr | New High‐Pressure Phase of CaCO3 at the Topmost Lower Mantle: Implication for the Deep‐Mantle Carbon Transportation |
| title_full_unstemmed | New High‐Pressure Phase of CaCO3 at the Topmost Lower Mantle: Implication for the Deep‐Mantle Carbon Transportation |
| title_short | New High‐Pressure Phase of CaCO3 at the Topmost Lower Mantle: Implication for the Deep‐Mantle Carbon Transportation |
| title_sort | new high pressure phase of caco3 at the topmost lower mantle implication for the deep mantle carbon transportation |
| topic | CaCO3‐VII CaCO3‐SiO2 reaction topmost lower mantle high pressure‐temperature carbon transportation |
| url | https://doi.org/10.1002/2017GL076536 |
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