PHASE RELATIONS, SINGULARITIES AND THERMOBAROMETRY OF METAMORPHIC ASSEMBLAGES CONTAINING PHENGITE, CHLORITE, BIOTITE, K-FELDSPAR, QUARTZ AND H2O
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dc.contributor.author | Simpson G.D.H. | |
dc.contributor.author | Thompson A.B. | |
dc.contributor.author | Connolly J.A.D. | |
dc.date.accessioned | 2021-01-25T04:55:57Z | |
dc.date.available | 2021-01-25T04:55:57Z | |
dc.date.issued | 2000 | |
dc.identifier | https://elibrary.ru/item.asp?id=984827 | |
dc.identifier.citation | Contributions to Mineralogy and Petrology, 2000, 139, 5, 555-569 | |
dc.identifier.issn | 0010-7999 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/23748 | |
dc.description.abstract | The phase relations of divariant and trivariant assemblages involving combinations of phengite, chlorite, biotite, K-feldspar, quartz and H2O in the KFASH, KMASH and KFMASH systems were calculated using a single thermodynamic data set (Holland and Powell 1998). The stability fields of the various equilibria are represented in P-T projections by contouring sets of compositional isopleths for the Tschermak (Al2(Fe,Mg)-1Si-1) and FeMg-1 exchanges controlled by the coexisting phases. Five multivariant continuous equilibria, which occur in different regions of P-T-X space, are calibrated as thermobarometers in metamorphic rocks of pelitic to quartzofeldspathic composition. More subtle P-T information, relating to the trajectories (dT/dz) along which reacting rocks have been buried or exhumed, can be extracted from the continuous reactions by investigating the recorded compositional trends in the Al2(Fe,Mg)-1Si-1 and FeMg-1 solutions. Singularities in P-T space are associated with some of these reactions and may result in unusual mineral textures and compositional trends. A fluid-absent singularity has particular petrological significance because it marks the transition between hydration and dehydration along a single reaction with increasing pressure and temperature. This behaviour causes the sequence of reactions among these minerals observed during metamorphism to be critically dependent on the P-T trajectory. Thermobarometric calculations show good agreement with respect to experimental and field-based data for phengite compositions less than about 50 mol% celadonite (<~3.5 Si p.f.u. phengite). | |
dc.title | PHASE RELATIONS, SINGULARITIES AND THERMOBAROMETRY OF METAMORPHIC ASSEMBLAGES CONTAINING PHENGITE, CHLORITE, BIOTITE, K-FELDSPAR, QUARTZ AND H2O | |
dc.type | Статья |
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