THE INFLUENCE OF CR ON THE GARNET-SPINEL TRANSITION IN THE EARTH'S MANTLE: EXPERIMENTS IN THE SYSTEM MGO-CR2O3-SIO2 AND THERMODYNAMIC MODELLING
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dc.contributor.author | Klemme S. | |
dc.date.accessioned | 2022-10-24T08:25:14Z | |
dc.date.available | 2022-10-24T08:25:14Z | |
dc.date.issued | 2004 | |
dc.identifier | https://elibrary.ru/item.asp?id=14525341 | |
dc.identifier.citation | Lithos, 2004, 77, 1-4 SPEC. ISS., 639-646 | |
dc.identifier.issn | 0024-4937 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/39042 | |
dc.description.abstract | The position of the transition from spinel peridotite to garnet peridotite in a simplified chemical composition has been determined experimentally at high pressures and high temperatures. The univariant reaction MgCr 2O 4+2Mg 2Si 2O 6=Mg 3Cr 2Si 3O 12+Mg 2SiO 4, has a negative slope in P- T space between 1200 °C and 1600 °C. The experimental results, combined with assessed thermodynamic data for MgCr 2O 4, MgSiO 3 and Mg 2SiO 4 give the entropy and enthalpy of formation of knorringite garnet (Mg 3Cr 2Si 3O 12). Thermodynamic calculations in simplified chemical compositions indicate that Cr shifts the garnet-in reaction to much higher pressures than previously anticipated. Moreover, in Cr-bearing systems a pressure-temperature field exists where garnet and spinel coexist. The width of this divariant field strongly depends on the Cr/(Cr+Al) of the system. | |
dc.subject | Garnet lherzolite | |
dc.subject | Spinel lherzolite | |
dc.subject | Experimental petrology | |
dc.subject | Chromium | |
dc.subject | Garnet spinel transition; | |
dc.subject | MgO–Cr2O3–SiO2 | |
dc.subject | MgO-Al2O3-Cr2O3–SiO2 | |
dc.title | THE INFLUENCE OF CR ON THE GARNET-SPINEL TRANSITION IN THE EARTH'S MANTLE: EXPERIMENTS IN THE SYSTEM MGO-CR2O3-SIO2 AND THERMODYNAMIC MODELLING | |
dc.type | Статья |
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