| Инд. авторы: | Rashchenko S.V., Kamada S., Hirao N., Litasov K.D., Ohtani E. |
| Заглавие: | In situ X-ray observation of 10 Å phase stability at high pressure |
| Библ. ссылка: | Rashchenko S.V., Kamada S., Hirao N., Litasov K.D., Ohtani E. In situ X-ray observation of 10 Å phase stability at high pressure // American Mineralogist. - 2016. - Vol.101. - Iss. 11. - P.2564-2569. - ISSN 0003-004X. - EISSN 1945-3027. |
| Внешние системы: | DOI: 10.2138/am-2016-5764; SCOPUS: 2-s2.0-84994639494; WoS: 000388365300017; |
| Реферат: | eng: The 10 Å phase, Mg3Si4O10(OH)2·H2O, is a high-pressure hydrous phyllosilicate considered as an important link in the succession of hydrous phases transporting water into the deep mantle. In this study, in situ synchrotron X-ray diffraction combined with external heating diamond-Anvil cell was used to determine limits of the 10 Å phase stability at pressures above 7 GPa. A reaction '10 Å phase + H2O → hydroxide-perovskite (3.65 Å phase) + stishovite' at about 10 GPa was found to be a high-pressure boundary of the 10 Å phase stability field. A dehydration temperature of the 10 Å phase '10 Å phase → enstatite + stishovite + H2O' decreases with pressure from 690 °C at 7 GPa to 450 °C at 10 GPa; a nonvariant point where 10 Å phase, hydroxide-perovskite and enstatite coexist in the presence of stishovite and hydrous fluid was found near 10 GPa and 450 °C. © 2016 by Walter de Gruyter Berlin/Boston 2016.
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| Ключевые слова: | DHMS; 3.65 Å phase; 10 Å phase; deep water cycle; hydroxide-perovskite; |
| Издано: | 2016 |
| Физ. характеристика: | с.2564-2569 |