RAMAN SPECTRA OF PHASE E AT VARIOUS PRESSURES AND TEMPERATURES WITH GEOPHYSICAL IMPLICATIONS
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dc.contributor.author | Liu L.G. | |
dc.contributor.author | Mernagh T.P. | |
dc.contributor.author | Lin C.C. | |
dc.contributor.author | Irifune T. | |
dc.date.accessioned | 2020-12-14T10:49:47Z | |
dc.date.available | 2020-12-14T10:49:47Z | |
dc.date.issued | 1997 | |
dc.identifier | https://elibrary.ru/item.asp?id=267762 | |
dc.identifier.citation | Earth and Planetary Science Letters, 1997, , 1, 57-65 | |
dc.identifier.issn | 0012-821X | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/20782 | |
dc.description.abstract | Variations in Raman spectra of phase E were investigated up to 340 kbar at room temperature and in the range 83-870 K at atmospheric pressure. Phase E appears to remain intact up to at least 870 K. However, the OH Raman band of phase E was not observable at temperatures above 473 K during heating, and it was not detected in the recovered sample. The temperature variation in Raman frequencies of phase E also showed abnormal behavior above 473 K. Thus, it is suggested that phase E dehydrated and converted to an imperfect forsterite above 473 K. Only the two most intense Raman bands of phase E were reliably measured in the high- pressure experiments. With the exception of the OH Raman band, the Raman frequencies of phase E increase with increasing pressure but decreased with increasing temperature. The frequency of the OH Raman band increases with increasing temperature, which parallels that observed in both phase A and the hydrous β-phase. The temperature dependency was observed to be linear below 500 K and the pressure dependency to be non-linear within the experimental uncertainties and the range investigated. It appears that phase E may be regarded as the hydrous form of forsterite and it is further suggested that phase E and the hydrous β-phase may be competitive hydrous phases in the upper mantle and transition zone. | |
dc.subject | PHASE E | |
dc.subject | RAMAN SPECTRUM | |
dc.subject | MANTLE P-T CONDITIONS | |
dc.title | RAMAN SPECTRA OF PHASE E AT VARIOUS PRESSURES AND TEMPERATURES WITH GEOPHYSICAL IMPLICATIONS | |
dc.type | Статья |
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