HIGH TEMPERATURE STABILITY LIMIT OF PHASE EGG, ALSIO3(OH)
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dc.contributor.author | Ono Sh. | |
dc.date.accessioned | 2021-01-10T10:33:41Z | |
dc.date.available | 2021-01-10T10:33:41Z | |
dc.date.issued | 1999 | |
dc.identifier | https://elibrary.ru/item.asp?id=1012537 | |
dc.identifier.citation | Contributions to Mineralogy and Petrology, 1999, , 1, 0083-0089 | |
dc.identifier.issn | 0010-7999 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/22566 | |
dc.description.abstract | The stability relations of phase egg, AlSiO3(OH), have been investigated at pressures from 7 to 20 GPa, and temperatures from 900 to 1700 °C in a multi-anvil apparatus. At the lower pressures phase egg breaks down according to the univariant reaction, phase egg = stishovite + topaz-OH, which extends from 1100 °C at 11 GPa to 1400 °C at 13 GPa where it terminates at an invariant point involving corundum. At pressures above the invariant point, the stability of phase egg is limited by the breakdown reaction, phase egg = stishovite + corundum + fluid, which extends from the invariant point to 1700 °C at 20 GPa. Stishovite crystallized in the Al2O3-SiO2-H2O system contains Al2O3, and the amount of Al2O3 increases with increasing temperature. It is inferred that the Al2O3 content is controlled by the charge-balanced substitution of Si4+ by Al3+ and H+. Aluminum-bearing stishovite coexisting with an H2O-rich fluid may contain a certain amount of water. Therefore, phase egg and stishovite in a subducting slab could transport some H2O into the deep Earth. | |
dc.title | HIGH TEMPERATURE STABILITY LIMIT OF PHASE EGG, ALSIO3(OH) | |
dc.type | Статья |
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