EXPERIMENTAL STUDY OF PARTIAL MELTING OF BIOTITE-ORTHOPYROXENE-QUARTZ BEARING ASSEMBLAGES IN THE SYSTEM KAIO2-MGO-FEO-SIO2-H2O
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dc.contributor.author | Graphchikov A.A. | |
dc.contributor.author | Konilov A.N. | |
dc.date.accessioned | 2020-12-01T08:37:40Z | |
dc.date.available | 2020-12-01T08:37:40Z | |
dc.date.issued | 1996 | |
dc.identifier | https://elibrary.ru/item.asp?id=13241912 | |
dc.identifier.citation | European Journal of Mineralogy, 1996, , 1, 143-152 | |
dc.identifier.issn | 0935-1221 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/20016 | |
dc.description.abstract | Melting temperatures of biotite-orthopyroxene-quartz assemblages were determined experimentally using biotites with various Fe-contents in the system KAlO2-MgO-FeO-SiCO2-H2O, in the pressure range 100-500 MPa and under the quartz-fayalite-magnetite fO2 buffer. All experiments were performed with synthetic phases. Water contents in the starting mixtures ranged from 11 to 78 wt.%. The compositions of coexisting minerals and melts were determined by electron microprobe. The analysis of glass (quenched liquids) in the experimental products showed them to have about 79 wt.% SiO2, with very low Fe and Mg contents which do not change with changing Fe-content of the system or temperature. The Fe/(Fe+Mg) ratio of the melt is greater than in the biotite and coexisting orthopyroxene. Solidus temperatures of biotite-orthopyroxene-quartz assemblages decrease considerably with increasing Fecontent in biotite. This means that water-saturated as well as fluid-absent (dehydration) melting of biotite-quartz assemblages may occur at temperatures between 700 and 800°C. Natural biotites are probably stabilized up to higher melting temperatures by the presence of titanium and aluminium. | |
dc.title | EXPERIMENTAL STUDY OF PARTIAL MELTING OF BIOTITE-ORTHOPYROXENE-QUARTZ BEARING ASSEMBLAGES IN THE SYSTEM KAIO2-MGO-FEO-SIO2-H2O | |
dc.type | Статья |
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