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Crystal chemistry of sodium in the Earth’s interior: the structure of Na2MgSi5O12 synthesized at 17.5 GPa and 1700°Cстатья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
- Авторы: Bindi L., Dymshits A.M., Bobrov A.V., Litasov K.D., Shatskyi A.F., Ohtani E., Litvin Yu A.
- Журнал: American Mineralogist
- Том: 96
- Год издания: 2011
- Издательство: Mineralogical Society of America
- Местоположение издательства: United States
- Первая страница: 447
- Последняя страница: 450
- DOI: 10.2138/am.2011.3716
- Аннотация: The crystal structure and chemical composition of a crystal of Na2MgSi5O12 garnet synthesized in the model system Mg3Al2Si3O12–Na2MgSi5O12 at 17.5 GPa and 1700 °C have been investigated. Quantitative analysis leads to the following formula: Na1.98Mg1.00Si5.01O12. Na2MgSi5O12 garnet was found to be tetragonal, space group I41/acd, with lattice parameters a = 11.3966(6), c = 11.3369(5) Å, V = 1472.5(1) Å3. The structure was refined to R = 5.13 % using 771 independent reflections. Na and Mg are disordered at the X sites (with a mean bond distance of 2.308 Å for both the sites) whereas Si is ordered at both the Y (mean: 1.793 Å) and Z sites (means: 1.630 and 1.624 Å). Na-bearing majoritic garnet may be an important potential sodium concentrator in the lower parts of the upper mantle and transition zone. The successful synthesis of the Na2MgSi5O12 end-member and its structural characterization is of key importance because the study of its thermodynamic constants combined with the data of computer modeling provides new constraints on thermobarometry of majorite garnet assemblages.
- Добавил в систему: Бобров Андрей Викторович