AN OXYGEN BAROMETER WITH THE ASSEMBLAGE GARNET-EPIDOTE
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dc.contributor.author | Donohue C.L. | |
dc.contributor.author | Essene E.J. | |
dc.date.accessioned | 2021-01-24T07:27:39Z | |
dc.date.available | 2021-01-24T07:27:39Z | |
dc.date.issued | 2000 | |
dc.identifier | https://elibrary.ru/item.asp?id=370239 | |
dc.identifier.citation | Earth and Planetary Science Letters, 2000, 181, 3, 459-472 | |
dc.identifier.issn | 0012-821X | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/23656 | |
dc.description.abstract | An oxygen barometer has been developed using garnet-epidote equilibria and the latest available thermodynamic data via the reaction:2 Ca2FeAl2Si3O12(OH)=2 Ca2FeAl2Si3O12+H2O+1/2 O2epidote (Ps33Czo67)garnet (Alm33Grs67)fluidwhere epidote (Ps33Czo67) reacts to form (Alm33Grs67), water and oxygen. The garnet-epidote oxybarometer has been applied to a wide variety of metamorphic rocks including low to medium-pressure greenschists and amphibolites, as well as high-pressure eclogites. Results indicate that this equation represents a sensitive oxygen monitor with only a minor dependence on pressure. Andradite solid solution of less than 15 mol% has only minor influence in the locus of the curve in fO2/T space. Garnet-epidote equilibria may also provide a thermometer when combined with an independent oxygen buffer. The garnet-epidote oxythermobarometer is a reliable oxygen sensor that can be applied to many low through medium-grade metamorphic rocks. The extensive solid solution found in both garnet and epidote allows this equation to be applied to mineral pairs with a wide range of compositions. The garnet-epidote oxythermobarometer is potentially applicable to any rocks that contain the equilibrium assemblage garnet+epidote. | |
dc.subject | GARNET GROUP | |
dc.subject | EPIDOTE | |
dc.subject | GEOLOGIC BAROMETRY | |
dc.subject | PHASE EQUILIBRIA | |
dc.subject | GEOLOGIC THERMOMETRY | |
dc.title | AN OXYGEN BAROMETER WITH THE ASSEMBLAGE GARNET-EPIDOTE | |
dc.type | Статья |
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