Инд. авторы:	Goryainov S.V., Likhacheva A.Yu, Tse J.S., Desgreniers S., Kawaguchi S.I., Pan Y., Molokeev M.S.
Заглавие:	In situ x-ray diffraction study of chrysotile at high p–t conditions: transformation to the 3.65 å phase
Библ. ссылка:	Goryainov S.V., Likhacheva A.Yu, Tse J.S., Desgreniers S., Kawaguchi S.I., Pan Y., Molokeev M.S. In situ x-ray diffraction study of chrysotile at high p–t conditions: transformation to the 3.65 å phase // Physics and Chemistry of Minerals. - 2021. - Vol.48. - Iss. 10. - Art.36. - ISSN 0342-1791. - EISSN 1432-2021.
Внешние системы:	DOI: 10.1007/s00269-021-01160-8; РИНЦ: 47085983;
Реферат:	eng: The behavior of chrysotile Mg3(Si2O5)(OH)4 in water medium at simultaneously high pressure and high temperature was studied by in situ synchrotron X-ray diffraction using a diamond anvil cell. In contrast to previous ‘dry’ experiments, chrysotile in water-saturated conditions undergoes two-phase transitions and exhibits higher thermal stability. At 260 °C / 3.7 GPa the initial chrysotile (phase I) transforms to the ‘chrysotile-like’ phase II, followed by the appearance of the ‘chrysotile-like’ phase III at 405 °C / 5.25 GPa. Phase III is characterized by enlarged interlayer distances, presumably resulting from the H2O intercalation into the interlayer space. During further compression, the ‘chrysotile-like’ phase III is decomposed to the 10 Å phase Mg3(Si4O10)(OH)2·xH2O, the 3.65 Å phase MgSi(OH)6, phase D, forsterite, enstatite and coesite or stishovite. The 3.65 Å phase appears at 8.8 GPa / 500 °C. The series of transformations leads to a water deficiency in the system, restricting the complete transformation from the 10 Å phase to the 3.65 Å phase. These data emphasize the crucial role of excess water in the stabilization of the high-pressure hydrous phases. The present study is the first in situ observation of sequential transformations of hydrous phases: serpentine → 10 Å phase → 3.65 Å phase, important as a potential water transport mechanism to the deep mantle.
Ключевые слова:	x-ray diffraction; synchrotron radiation; serpentine; high temperature; high pressure; chrysotile;
Издано:	2021
Физ. характеристика:	36
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