EXPERIMENTAL DETERMINATION OF THE EQUILIBRIA: RUTILE + MAGNESITE = GEIKIELITE + CO2 AND ZIRCON + 2 MAGNESITE = BADDELEYITE + FORSTERITE + 2 CO2
- DSpace Home
- →
- Геология России
- →
- ELibrary
- →
- View Item
JavaScript is disabled for your browser. Some features of this site may not work without it.
dc.contributor.author | Ferry J.M. | |
dc.contributor.author | Newton R.C. | |
dc.contributor.author | Manning C.E. | |
dc.date.accessioned | 2021-09-29T08:17:00Z | |
dc.date.available | 2021-09-29T08:17:00Z | |
dc.date.issued | 2002 | |
dc.identifier | https://elibrary.ru/item.asp?id=14238255 | |
dc.identifier.citation | American Mineralogist, 2002, 87, 10, 1342-1350 | |
dc.identifier.issn | 0003-004X | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/30669 | |
dc.description.abstract | The P-T conditions of both equilibria were determined precisely by reversal experiments in a piston-cylinder apparatus. On the basis of 8 experiments. brackets for the rutile-magnesite-geikielite equilibrium are 7.0-7.1 kbar at 800°C, 8.6-8.7 kbar at 850°C, and 10.5-10.7 kbar at 900°C. On the basis of 9 experiments. brackets for the zircon-magnesite-baddeleyite-forsterite equilibrium are 7.1-7.7 kbar at 800°C,fss 9.2-9.4 kbar at 850°C, and 10.7-10.9 kbar at 900°C. Considering experimental uncertainties in P (±300 bars) and T (±3 °C), equilibrium curves calculated from both the Berman and the Holland and Powell databases pass through all brackets. Molar Gibbs free energy of formation from the elements at 1 bar and 298 K for geikielite and zircon, derived from the experiments and consistent with the Berman database, are -1481.94 ± 0.67 kJ and -1917.54 ± 1.25 kJ, respectively. Corresponding values consistent with the Holland and Powell database are -1479.30 ± 0.74 kJ and -1918.47 ± 1.49 kJ. Application of the two equilibria indicate that: (1) the mole fraction of CO2 in fluid was 0.54-1.00 when geikielite and baddeleyite formed during contact metamorphism of siliceous dolomites in the Ballachulish aureole, Scotland; (2) the activity of CO2 could have been as low as 2.10-5 during ultra-high pressure metamorphism of magnesite-bearing ecologites; and (3) the activity of CO2 was <0.18 during one instance of mantle metasomatism. | |
dc.title | EXPERIMENTAL DETERMINATION OF THE EQUILIBRIA: RUTILE + MAGNESITE = GEIKIELITE + CO2 AND ZIRCON + 2 MAGNESITE = BADDELEYITE + FORSTERITE + 2 CO2 | |
dc.type | Статья |
Files in this item
This item appears in the following Collection(s)
-
ELibrary
Метаданные публикаций с сайта https://www.elibrary.ru