Article révisé par les pairs
| Résumé : | Graphite-bearing garnet-cordierite rocks from the Sjelset-Vikesá region, south Bogaland, Norway have been analysed by microprobe methods. The garnets belong to the pyropealmandine series and contain 28 mole% pyrope, while the cordierites contain about 71% of the Mg end-member. A regional temperature of about 720-750°C and a lithostatic pressure in the order of 6-7 kb have been inferred from the garnet and cordierite compositions. The petrographic observation suggests that such PT conditions might reflect a retrograde metamorphic event. A tentative estimation of the fluid phase composition, based on the study of opaque minerals, is presented. © 1974. |
