NO LIQUID IMMISCIBILITY IN THE SYSTEM MGSIO3-SIO2 AT 5.0 GPA
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dc.contributor.author | Dalton J.A. | |
dc.contributor.author | Presnall D.C. | |
dc.date.accessioned | 2020-12-16T02:24:04Z | |
dc.date.available | 2020-12-16T02:24:04Z | |
dc.date.issued | 1997 | |
dc.identifier | https://elibrary.ru/item.asp?id=273797 | |
dc.identifier.citation | Geochimica et Cosmochimica Acta, 1997, , 12, 2367-2373 | |
dc.identifier.issn | 0016-7037 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/20902 | |
dc.description.abstract | Liquidus phase relationships in the system MgSiO3-SiO2 at 5.0 GPa have been determined using a multianvil apparatus. Compared to phase relationships at 1 atm, the MgSiO3-SiO2 phase diagram at 5.0 GPa is significantly different in two respects. First, the composition of the eutectic between MgSiO3 and SiO2 moves from 65.0 wt% SiO2 at 1 atm/1547°C (protoenstatite-cristobalite eutectic; Bowen and Andersen, 1914) to 68.8 wt% SiO2 (orthoenstatite-coesite eutectic) at 5.0 GPa/1930°C. Second, no stable two-liquid field is present in the MgSiO3-SiO2 system at 5.0 GPa. The unbroken coesite liquids curve is inflected indicating the presence of a submerged, metastable miscibility gap below the liquidus. Thus, although the temperature of the solvus critical point is likely to increase with pressure, the dT/dP slope of the SiO2 liquidus is much steeper and as a result, the immiscibility dome has become submerged completely. The reduction in liquid immiscibility in the MgSiO3-SiO2 system at 5.0 GPa implies that in more complex systems relevant to the Earth, immiscibility will also be suppressed at high pressures. | |
dc.title | NO LIQUID IMMISCIBILITY IN THE SYSTEM MGSIO3-SIO2 AT 5.0 GPA | |
dc.type | Статья |
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