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The Mg3Al2Si3O12-Na2MgSi5O12 system at pressures of 7.0 and 8.5 GPa and a temperature of 1300–1800°C: Phase relationships and crystallization of Na-bearing majoritic garnet |
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| Authors: | A V Bobrov A M Dymshits Yu A Litvin L Bindi |
| Institution: | 1. Department of Petrology, Faculty of Geology, Moscow State University, Moscow, 119899, Russia 2. Vernadskii Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences, Moscow, 119991, Russia 3. Institute of Experimental Mineralogy, Russian Academy of Sciences, Chernogolovka, Moscow oblast, 142432, Russia 4. Museo di Storia Naturale, Sezione di Mineralogia, Universita di Firenze, Firenze, Italy 5. Istituto di Geoscienze e Georisorse, Sezione di Firenze, Firenze, Italy |
| Abstract: | The results of an experimental study of the pyrope (Mg3Al2Si3O12)-jadeite (NaAlSi2O6) system at P = 7.0 and 8.5 GPa and T = 1300?C1800°C are summarized in this paper. The main phases that were obtained in the experiments are garnet, pyroxene, kyanite (in some cases corundum), and quenched melt. Garnets are characterized by a stable Na2O admixture (up to 0.6 wt % at 7.0 GPa and up to 0.8 wt % at 8.5 GPa) and the high silicon content (Si = 3.016?C3.166). The maximal sodium concentrations in garnet were found at the solidus of the system, which results from an increase of the coefficient of sodium partitioning between garnet and melt during a temperature decrease. |
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