HORNBLENDE-GARNET-PLAGIOCLASE THERMOBAROMETRY: A NATURAL ASSEMBLAGE CALIBRATION OF THE THERMODYNAMICS OF HORNBLENDE
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dc.contributor.author | Dale J. | |
dc.contributor.author | Holland T. | |
dc.contributor.author | Powell R. | |
dc.date.accessioned | 2021-01-25T04:55:58Z | |
dc.date.available | 2021-01-25T04:55:58Z | |
dc.date.issued | 2000 | |
dc.identifier | https://elibrary.ru/item.asp?id=984864 | |
dc.identifier.citation | Contributions to Mineralogy and Petrology, 2000, 140, 3, 353-362 | |
dc.identifier.issn | 0010-7999 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/23758 | |
dc.description.abstract | Calibrations are presented for an independent set of four equilibria between end-members of garnet, hornblende, plagioclase and quartz. Thermodynamic data from a large internally-consistent thermodynamic dataset are used to determine the ΔG° of the equilibria. Then, with the known mixing properties of garnet and plagioclase, the non-ideal mixing in amphibole is derived from a set of 74 natural garnet-amphibole-plagioclase-quartz assemblages crystallised in the range 4-13 kbar and 500-800 °C. The advantage of using known thermodynamic data to calculate ΔG° is that correlated variations of composition with temperature and pressure are not manifested in fictive derived entropies and volumes, but are accounted for with non-ideal mixing terms. The amphibole is modelled using a set of ten independent end-members whose mixing parameters are in good agreement with the small amount of data available in the literature. The equilibria used to calibrate the amphibole non-ideal mixing reproduce pressures and temperatures with average absolute deviations of 1.1 kbar and 35 °C using an average pressure-temperature approach, and 0.8 kbar with an average pressure approach. The mixing data provide not only a basis for thermobarometry involving additional phases, but also for calculation of phase diagrams in complex amphibole-bearing systems. | |
dc.title | HORNBLENDE-GARNET-PLAGIOCLASE THERMOBAROMETRY: A NATURAL ASSEMBLAGE CALIBRATION OF THE THERMODYNAMICS OF HORNBLENDE | |
dc.type | Статья |
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