Aluminum solubility in bridgmanite up to 3000 K at the top lower mantle
The temperature dependence of the Al2O3 solubility in bridgmanite has been determined in the system MgSiO3–Al2O3 at temperatures of 2750–3000 K under a constant pressure of 27 GPa using a multi-anvil apparatus. Bridgmanite becomes more aluminous with increasing temperatures. A LiNbO3-type phase wi...
| Main Authors: | , , , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2021-03-01
|
| Series: | Geoscience Frontiers |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S1674987120301110 |
| _version_ | 1797727433951019008 |
|---|---|
| author | Zhaodong Liu Ran Liu Yucheng Shang Fangren Shen Luyao Chen Xuyuan Hou Mingguang Yao Tian Cui Bingbing Liu Tomoo Katsura |
| author_facet | Zhaodong Liu Ran Liu Yucheng Shang Fangren Shen Luyao Chen Xuyuan Hou Mingguang Yao Tian Cui Bingbing Liu Tomoo Katsura |
| author_sort | Zhaodong Liu |
| collection | DOAJ |
| description | The temperature dependence of the Al2O3 solubility in bridgmanite has been determined in the system MgSiO3–Al2O3 at temperatures of 2750–3000 K under a constant pressure of 27 GPa using a multi-anvil apparatus. Bridgmanite becomes more aluminous with increasing temperatures. A LiNbO3-type phase with a pyrope composition (Mg3Al2Si3O12) forms at 2850 K, which is regarded as to be transformed from bridgmanite upon decompression. This phase contains 30 mol% Al2O3 at 3000 K. The MgSiO3 solubility in corundum also increases with temperatures, reaching 52 mol% at 3000 K. Molar volumes of the hypothetical Al2O3 bridgmanite and MgSiO3 corundum are constrained to be 25.95 ± 0.05 and 26.24 ± 0.06 cm3/mol, respectively, and interaction parameters of non-ideality for these two phases are 5.6 ± 0.5 and 2.2 ± 0.5 KJ/mol, respectively. The increases in Al2O3 and MgSiO3 contents, respectively, in bridgmanite and corundum are caused by a larger entropy of Al2O3 bridgmanite plus MgSiO3 corundum than that of MgSiO3 bridgmanite plus Al2O3 corundum with temperature, in addition to the configuration entropy. Our study may help explain dynamics of the top lower mantle and constrain pressure and temperature conditions of shocked meteorites. |
| first_indexed | 2024-03-12T10:59:40Z |
| format | Article |
| id | doaj.art-7e99e183fd4e48578670030775384e90 |
| institution | Directory Open Access Journal |
| issn | 1674-9871 |
| language | English |
| last_indexed | 2024-03-12T10:59:40Z |
| publishDate | 2021-03-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Geoscience Frontiers |
| spelling | doaj.art-7e99e183fd4e48578670030775384e902023-09-02T05:55:13ZengElsevierGeoscience Frontiers1674-98712021-03-01122929935Aluminum solubility in bridgmanite up to 3000 K at the top lower mantleZhaodong Liu0Ran Liu1Yucheng Shang2Fangren Shen3Luyao Chen4Xuyuan Hou5Mingguang Yao6Tian Cui7Bingbing Liu8Tomoo Katsura9Bayerisches Geoinstitut, University of Bayreuth, Bayreuth, 95440, Germany; State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China; Corresponding author. Bayerisches Geoinstitut, University of Bayreuth, Bayreuth, 95440, Germany.State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, ChinaState Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, ChinaState Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, ChinaState Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, ChinaState Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, ChinaState Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, ChinaState Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, ChinaState Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, ChinaBayerisches Geoinstitut, University of Bayreuth, Bayreuth, 95440, Germany; Center for High Pressure Science and Technology Advanced Research, Beijing 100094, ChinaThe temperature dependence of the Al2O3 solubility in bridgmanite has been determined in the system MgSiO3–Al2O3 at temperatures of 2750–3000 K under a constant pressure of 27 GPa using a multi-anvil apparatus. Bridgmanite becomes more aluminous with increasing temperatures. A LiNbO3-type phase with a pyrope composition (Mg3Al2Si3O12) forms at 2850 K, which is regarded as to be transformed from bridgmanite upon decompression. This phase contains 30 mol% Al2O3 at 3000 K. The MgSiO3 solubility in corundum also increases with temperatures, reaching 52 mol% at 3000 K. Molar volumes of the hypothetical Al2O3 bridgmanite and MgSiO3 corundum are constrained to be 25.95 ± 0.05 and 26.24 ± 0.06 cm3/mol, respectively, and interaction parameters of non-ideality for these two phases are 5.6 ± 0.5 and 2.2 ± 0.5 KJ/mol, respectively. The increases in Al2O3 and MgSiO3 contents, respectively, in bridgmanite and corundum are caused by a larger entropy of Al2O3 bridgmanite plus MgSiO3 corundum than that of MgSiO3 bridgmanite plus Al2O3 corundum with temperature, in addition to the configuration entropy. Our study may help explain dynamics of the top lower mantle and constrain pressure and temperature conditions of shocked meteorites.http://www.sciencedirect.com/science/article/pii/S1674987120301110BridgmaniteLiNbO3-type phaseCorundumTemperatureEntropyLower mantle |
| spellingShingle | Zhaodong Liu Ran Liu Yucheng Shang Fangren Shen Luyao Chen Xuyuan Hou Mingguang Yao Tian Cui Bingbing Liu Tomoo Katsura Aluminum solubility in bridgmanite up to 3000 K at the top lower mantle Geoscience Frontiers Bridgmanite LiNbO3-type phase Corundum Temperature Entropy Lower mantle |
| title | Aluminum solubility in bridgmanite up to 3000 K at the top lower mantle |
| title_full | Aluminum solubility in bridgmanite up to 3000 K at the top lower mantle |
| title_fullStr | Aluminum solubility in bridgmanite up to 3000 K at the top lower mantle |
| title_full_unstemmed | Aluminum solubility in bridgmanite up to 3000 K at the top lower mantle |
| title_short | Aluminum solubility in bridgmanite up to 3000 K at the top lower mantle |
| title_sort | aluminum solubility in bridgmanite up to 3000 k at the top lower mantle |
| topic | Bridgmanite LiNbO3-type phase Corundum Temperature Entropy Lower mantle |
| url | http://www.sciencedirect.com/science/article/pii/S1674987120301110 |
| work_keys_str_mv | AT zhaodongliu aluminumsolubilityinbridgmaniteupto3000katthetoplowermantle AT ranliu aluminumsolubilityinbridgmaniteupto3000katthetoplowermantle AT yuchengshang aluminumsolubilityinbridgmaniteupto3000katthetoplowermantle AT fangrenshen aluminumsolubilityinbridgmaniteupto3000katthetoplowermantle AT luyaochen aluminumsolubilityinbridgmaniteupto3000katthetoplowermantle AT xuyuanhou aluminumsolubilityinbridgmaniteupto3000katthetoplowermantle AT mingguangyao aluminumsolubilityinbridgmaniteupto3000katthetoplowermantle AT tiancui aluminumsolubilityinbridgmaniteupto3000katthetoplowermantle AT bingbingliu aluminumsolubilityinbridgmaniteupto3000katthetoplowermantle AT tomookatsura aluminumsolubilityinbridgmaniteupto3000katthetoplowermantle |